Downlink control information transmission method and apparatus

Abstract

The present application provides a downlink control information (DCI) transmission method and apparatus. The method includes a terminal monitoring a first DCI format based on an instruction, the first DCI format being usable for scheduling data transmission of two or more cells, and when the first cell is in an inactive mode or a dormant mode, determining an amount of information bits of the first DCI format based on a first bandwidth portion (BWP) of the first cell, and monitoring the first DCI format based on the amount of information bits of the first DCI format. The technical solution of the present application helps to accurately determine the DCI format and improve information transmission performance.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 202211231949.3, entitled "DOWNLINK CONTROL INFORMATION TRANSMISSION METHOD AND APPARATUS," filed with the State Intellectual Property Office of China on September 30, 2022, and Chinese Patent Application No. 202211362876.1, entitled "DOWNLINK CONTROL INFORMATION TRANSMISSION METHOD AND APPARATUS," filed with the State Intellectual Property Office of China on November 2, 2022, both of which applications are incorporated herein by reference in their entireties.

[0002] The present application relates to the field of wireless communications, and more particularly to a method and apparatus for transmitting downlink control information. [Background technology]

[0003] With the development of communication technology, cross-carrier scheduling (CCS) has been introduced into new radio (NR) communication systems, i.e., a downlink carrier of one cell carries a control channel to schedule the uplink and downlink data channels of another cell. The cell carrying the control channel is called a scheduling cell, and the cell carrying the uplink and downlink data channels is called a scheduled cell. In CCS, one scheduling cell can correspond to multiple scheduled cells, i.e., one scheduling cell can transmit a control channel to perform data scheduling for multiple scheduled cells. Therefore, scheduling data transmissions of multiple scheduled cells by using one downlink control information (DCI) has become a research focus.

[0004] When one DCI is used to schedule data transmissions of multiple scheduled cells, some fields in the DCI may be shared by the multiple cells, and some fields, i.e., specific indicator fields, need to be configured independently for the cells. The specific indicator fields are associated with the active bandwidth part (BWP) configuration of the scheduled cell. Therefore, the specific indicator field of the scheduled cell may be determined based on the BWP configuration of the scheduled cell. However, to simultaneously schedule data transmissions of multiple cells, the scheduled cells are combined in the DCI and indicated in the carrier indicator field (CIF). Correspondingly, the BWP or BWP identification (ID) of each scheduled cell is further configured in the bandwidth part (BWP) indicator field. Typically, to reduce the overhead of the carrier indicator field (CIF), the CIF does not need to indicate the combination of all cells. In addition, when a scheduled cell in an inactive mode or a dormant mode exists among multiple scheduled cells, the BWP or BWP ID is not configured for the cell according to existing protocols. As a result, the specific indicator field of the scheduled cell cannot be accurately determined, and the scheduling of the scheduled cell cannot be accurately completed. Therefore, when there are scheduled cells in inactive mode or dormant mode among multiple scheduled cells, how to set the BWP ID and specific indicator field of these cells becomes an urgent problem to be solved.

[0005] Therefore, when one DCI is used to schedule data transmissions of multiple scheduled cells, a method for accurately determining the DCI format and improving information transmission performance is urgently needed. Summary of the Invention [Means for solving the problem]

[0006] The present application provides a downlink control information transmission method and apparatus to help accurately determine a DCI format and improve information transmission performance when one DCI is used to schedule data transmission of multiple scheduled cells.

[0007] According to a first aspect, there is provided a downlink control information transmission method, the method being executed by a terminal device and including: receiving first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to the terminal device to monitor a first downlink control information (DCI) format, the first DCI format being usable for scheduling data transmissions of two or more cells; determining, when the first cell is in an inactive mode or a dormant mode, an amount of information bits of the first DCI format based on a first bandwidth portion (BWP) of the first cell; and monitoring the first DCI format based on the amount of information bits of the first DCI format.

[0008] The use of the first DCI format to schedule data transmissions of two or more cells means that the first DCI format can be used to schedule uplink data transmissions and downlink data transmissions of two or more cells. Optionally, the first DCI format can be used to schedule data transmissions of the first cell. The terminal device can detect the first DCI format in a second cell. The first cell is different from the second cell. For example, the first cell may be a secondary cell of the terminal device, and the second cell may be a primary cell of the terminal device. The terminal monitoring the first DCI format based on the amount of information bits of the first DCI format may be understood as the terminal determining a DCI size of the first DCI format based on the amount of information bits of the first DCI format and the amount of information bits of another DCI format, and monitoring the first DCI format based on the DCI size of the first DCI format. In the present application, when DCI size matching needs to be performed for a first DCI format and another DCI format, the amount of information bits of the first DCI format is the amount of information bits of the first DCI format before DCI size matching, the amount of information bits of the first DCI format before bit padding, or the amount of information bits of the first DCI format before bit truncation.

[0009] According to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when the first cell is in active mode or idle mode, the format of the DCI is determined based on the BWP ID of the first cell, which is helpful to accurately determine the DCI format and improve information transmission performance.

[0010] Referring to the first aspect, in some implementation forms of the first aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0011] Referring to the first aspect, in some implementation forms of the first aspect, the first BWP is one of the last non-dormant active uplink BWP used before the first cell was in the current inactive mode or dormant mode, the last non-dormant active downlink BWP used before the first cell was in the current inactive mode or dormant mode, the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell during the active time, the first corresponding non-dormant BWP of the first cell outside the active time, an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell during the active time, an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, or the currently active uplink BWP. In this application, the non-dormant active uplink BWP of the first cell is the active uplink BWP used when the first cell is in active mode and non-dormant mode, or the active uplink BWP used when the first cell is in active mode.

[0012] Referring to the first aspect, in some implementation forms of the first aspect, determining the amount of information bits of the first DCI format based on the first BWP of the first cell may specifically include determining the amount of information bits of the first DCI format based on the first BWP and a third BWP of the first cell, where the first BWP is the last non-dormant active downlink BWP used before the first cell is currently in the inactive mode or the dormant mode, the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell within the active time, or the first corresponding non-dormant BWP of the first cell outside the active time. The third BWP is one of the following: the last non-dormant active uplink BWP used before the first cell is in the current inactive or dormant mode; the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; an uplink BWP whose identifier ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time; or the current active uplink BWP.

[0013] Referring to the first aspect, in some implementation forms of the first aspect, when the first cell is in an inactive mode, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode. If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a non-dormant BWP, the first BWP is configured for the first cell and is the first active downlink BWP used when the first cell is switched from the inactive mode to the active mode. The third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from the inactive mode to the active mode. If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell; if the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell;If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; or if the first active downlink BWP configured for the first cell and used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time.

[0014] Referring to the first aspect, in some implementation forms of the first aspect, when the first cell is in a dormant mode, the first BWP is the last non-dormant active downlink BWP used before the first cell is in the current dormant mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell is in the current dormant mode. When the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is the last non-dormant active uplink BWP used before the first cell is in the current dormant mode. The BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, and when a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP becomes active. The first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP isAn uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time, or if a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time.

[0015] Referring to the first aspect, in some implementation forms of the first aspect, before determining the amount of information bits of the first DCI format, the method further includes determining a first BWP ID, where the first BWP ID is an ID of the first BWP.

[0016] Referring to the first aspect, in some implementations of the first aspect, determining the first BWP ID includes determining that the first BWP ID is a first preset value.

[0017] Referring to the first aspect, in some implementation forms of the first aspect, determining the first BWP ID includes determining that the bit width of the BWP indicator field of the first cell in the first DCI format is M bits, and determining that the first BWP ID is a maximum value corresponding to M bits, where M is a positive integer.

[0018] Referring to the first aspect, in some other implementation forms of the first aspect, when the first cell is in an inactive mode, determining the first BWP ID includes determining that the first BWP ID is the ID of a first active BWP used when the first cell is switched from an inactive mode to an active mode, or determining that the first BWP ID is the ID of an active BWP used before the first cell was switched from an active mode to the current inactive mode.

[0019] Referring to the first aspect, in some further implementations of the first aspect, determining the first BWP ID when the first cell is in an inactive mode includes determining that the first BWP ID is a dedicated inactive BWP ID when a dedicated inactive BWP ID is preconfigured for the first cell, or determining that the first BWP ID is a dormant BWP ID when a dormant BWP ID is preconfigured for the first cell and a dedicated inactive BWP ID is not preconfigured for the first cell.

[0020] Referring to the first aspect, in some further implementations of the first aspect, when the first cell is in a dormant mode, determining the first BWP ID includes determining that the first BWP ID is the first corresponding non-dormant BWP ID within the active time when the first corresponding non-dormant BWP ID within the active time is preconfigured for the first cell, or determining that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time when the first corresponding non-dormant BWP ID within the active time is preconfigured for the first cell and the first corresponding non-dormant BWP ID within the active time is not preconfigured for the first cell.

[0021] Referring to the first aspect, in some further implementation forms of the first aspect, when the first cell is in a dormant mode, determining the first BWP ID includes receiving a second DCI format, switching the active downlink BWP of the first cell to a dormant BWP based on the second DCI format, and determining, when the second DCI format is received within the active time, that the first BWP ID is the first corresponding non-dormant BWP ID within the active time, or determining, when the second DCI format is received outside the active time, that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time.

[0022] Referring to the first aspect, in some further implementations of the first aspect, determining the first BWP ID includes determining that the first BWP ID is a dormant BWP ID when the dormant BWP ID is pre-configured for the first cell.

[0023]

[0013] Referring to the first aspect, in some implementations of the first aspect, the first cell operates in a time division duplex (TDD) mode, and a first DCI format is used to schedule downlink data transmissions. The method further includes receiving second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to a terminal device to monitor a second downlink control information (DCI) format, the second DCI format being usable to schedule uplink data transmissions of two or more cells; determining, when the first cell is in an inactive mode or a dormant mode, a quantity of information bits of the second DCI format based on a second BWP of the first cell, where an ID of the first BWP is the same as an ID of the second BWP; and monitoring the second DCI format based on the quantity of information bits of the second DCI format.

[0024]

[0013] Referring to the first aspect, in some other implementation forms of the first aspect, the first cell operates in a frequency division duplex (FDD) mode, and a first DCI format is used to schedule downlink data transmissions. The method further includes receiving second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to a terminal device to monitor a second downlink control information (DCI) format, the second DCI format being usable to schedule uplink data transmissions of two or more cells; determining, when the first cell is in a dormant mode, a quantity of information bits of the second DCI format based on a second BWP of the first cell, the second BWP being an active uplink BWP of the first cell; and monitoring the second DCI format based on the quantity of information bits of the second DCI format.

[0025] Referring to the first aspect, in some implementations of the first aspect, determining the amount of information bits of the first DCI format based on the first BWP ID of the first cell further includes determining the amount of information bits of the first DCI format based on a configuration of a BWP whose ID is the first BWP ID in the first cell.

[0026] Referring to the first aspect, in some implementations of the first aspect, the method further includes determining, based on a first BWP ID of the first cell, an amount of information bits of a particular indicator field corresponding to the first cell in the first DCI format.

[0027] According to a second aspect, there is provided a downlink control information transmission method, the method being executed by a network device and including: transmitting first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being usable for scheduling data transmissions of two or more cells; determining, when the first cell is in an inactive mode or a dormant mode, an amount of information bits of the first DCI format based on a first bandwidth portion (BWP) of the first cell; and monitoring the first DCI format based on the amount of information bits of the first DCI format.

[0028] A network device transmitting a first DCI format based on the amount of information bits of the first DCI format may be understood as a network device determining a DCI size of the first DCI format based on the amount of information bits of the first DCI format and the amount of information bits of another DCI format, and transmitting the first DCI format based on the DCI size of the first DCI format. In the present application, if DCI size matching needs to be performed for the first DCI format and another DCI format, the amount of information bits of the first DCI format is the amount of information bits of the first DCI format before DCI size matching, the amount of information bits of the first DCI format before bit padding, or the amount of information bits of the first DCI format before bit truncation.

[0029] According to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when the first cell is in active mode or idle mode, the format of the DCI is determined based on the BWP ID of the first cell, which is helpful to accurately determine the DCI format and improve information transmission performance.

[0030] Referring to the second aspect, in some implementation forms of the second aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0031] Referring to the second aspect, in some implementation forms of the second aspect, the first BWP is one of the last non-dormant active uplink BWP used before the first cell was in the current inactive mode or dormant mode, the last non-dormant active downlink BWP used before the first cell was in the current inactive mode or dormant mode, the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell during the active time, the first corresponding non-dormant BWP of the first cell outside the active time, an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell during the active time, an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, or the currently active uplink BWP. In this application, the non-dormant active uplink BWP of the first cell is the active uplink BWP used when the first cell is in active mode and non-dormant mode, or the active uplink BWP used when the first cell is in active mode.

[0032] Referring to the second aspect, in some implementation forms of the second aspect, determining the amount of information bits of the first DCI format based on the first BWP of the first cell may specifically include determining the amount of information bits of the first DCI format based on the first BWP and a third BWP of the first cell, where the first BWP is the last non-dormant active downlink BWP used before the first cell is currently in the inactive mode or the dormant mode, the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell within the active time, or the first corresponding non-dormant BWP of the first cell outside the active time. The third BWP is one of the following: the last non-dormant active uplink BWP used before the first cell is in the current inactive or dormant mode; the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; an uplink BWP whose identifier ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time; or the current active uplink BWP.

[0033] Referring to the second aspect, in some implementation forms of the second aspect, when the first cell is in an inactive mode, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode. If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a non-dormant BWP, the first BWP is the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode. The third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode. If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell; if the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell;If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; or if the first active downlink BWP configured for the first cell and used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time.

[0034] Referring to the second aspect, in some implementation forms of the second aspect, when the first cell is in a dormant mode, the first BWP is the last non-dormant active downlink BWP used before the first cell is in the current dormant mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell is in the current dormant mode. When the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is the last non-dormant active uplink BWP used before the first cell is in the current dormant mode. The BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, and when a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP becomes active. The first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP isAn uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time, or if a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time.

[0035] Referring to the second aspect, in some implementation forms of the second aspect, before determining the amount of information bits of the first DCI format, the method further includes determining a first BWP ID, where the first BWP ID is an ID of the first BWP.

[0036] Referring to the second aspect, in some implementations of the second aspect, determining the first BWP ID includes determining that the first BWP ID is a first preset value.

[0037] Referring to the second aspect, in some implementation forms of the second aspect, determining the first BWP ID includes determining that the bit width of the BWP indicator field of the first cell in the first DCI format is M bits, and determining that the first BWP ID is a maximum value corresponding to M bits, where M is a positive integer.

[0038] Referring to the second aspect, in some implementation forms of the second aspect, when the first cell is in an inactive mode, determining the first BWP ID includes determining that the first BWP ID is the ID of a first active BWP used when the first cell is switched from an inactive mode to an active mode, or determining that the first BWP ID is the ID of an active BWP used before the first cell was switched from an active mode to the current inactive mode.

[0039] Referring to the second aspect, in some further implementations of the second aspect, determining the first BWP ID when the first cell is in an inactive mode includes determining that the first BWP ID is a dedicated inactive BWP ID when a dedicated inactive BWP ID is preconfigured for the first cell, or determining that the first BWP ID is a dormant BWP ID when a dormant BWP ID is preconfigured for the first cell and a dedicated inactive BWP ID is not preconfigured for the first cell.

[0040] Referring to the second aspect, in some further implementations of the second aspect, when the first cell is in a dormant mode, determining the first BWP ID includes determining that the first BWP ID is the first corresponding non-dormant BWP ID within the active time when the first corresponding non-dormant BWP ID within the active time is preconfigured for the first cell, or determining that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time when the first corresponding non-dormant BWP ID within the active time is preconfigured for the first cell and the first corresponding non-dormant BWP ID within the active time is not preconfigured for the first cell.

[0041] Referring to the second aspect, in some further implementation forms of the second aspect, when the first cell is in a dormant mode, determining the first BWP ID includes transmitting a second DCI format, switching the active downlink BWP of the first cell to a dormant BWP based on the second DCI format, and when the second DCI format is transmitted within the active time, determining that the first BWP ID is the first corresponding non-dormant BWP ID within the active time, or when the second DCI format is transmitted outside the active time, determining that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time.

[0042] Referring to the second aspect, in some further implementations of the second aspect, determining the first BWP ID includes determining that the first BWP ID is a dormant BWP ID when the dormant BWP ID is pre-configured for the first cell.

[0043] Referring to the second aspect, in some implementations of the second aspect, the first cell operates in a time division duplex (TDD) mode, and a first DCI format is used to schedule downlink data transmissions. The method further includes: transmitting second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to a terminal device to monitor a second downlink control information (DCI) format, the second DCI format being usable to schedule uplink data transmissions of two or more cells; determining, when the first cell is in an inactive mode or a dormant mode, a quantity of information bits of the second DCI format based on a second BWP of the first cell, where an ID of the first BWP is the same as an ID of the second BWP; and monitoring the second DCI format based on the quantity of information bits of the second DCI format.

[0044]

[0013] Referring to the second aspect, in some other implementation forms of the second aspect, the first cell operates in a frequency division duplex (FDD) mode, and a first DCI format is used to schedule downlink data transmissions. The method further includes: transmitting second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to a terminal device to monitor a second downlink control information (DCI) format, the second DCI format being usable to schedule uplink data transmissions of two or more cells; determining, when the first cell is in a dormant mode, a quantity of information bits of the second DCI format based on a second BWP of the first cell, the second BWP being an active uplink BWP of the first cell; and monitoring the second DCI format based on the quantity of information bits of the second DCI format.

[0045] Referring to the second aspect, in some implementation forms of the second aspect, determining the amount of information bits of the first DCI format based on the first BWP ID of the first cell further includes determining the amount of information bits of the first DCI format based on the configuration of a BWP whose ID is the first BWP ID in the first cell.

[0046] Referring to the second aspect, in some implementations of the second aspect, the method further includes determining, based on a first BWP ID of the first cell, an amount of information bits of a particular indicator field corresponding to the first cell in the first DCI format.

[0047] According to a third aspect, there is provided a downlink control information transmission apparatus. The apparatus is configured to implement the functions of the terminal device according to the first aspect or is a terminal device. The apparatus includes: a transceiver unit configured to receive first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to the terminal device to monitor a first downlink control information (DCI) format, the first DCI format being usable for scheduling data transmissions of two or more cells; and a processing unit configured to determine, when the first cell is in an inactive mode or a dormant mode, a quantity of information bits of the first DCI format based on a first bandwidth portion (BWP) of the first cell. The transceiver unit is further configured to monitor the first DCI format based on the quantity of information bits of the first DCI format.

[0048] Referring to the third aspect, in some implementation forms of the third aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0049] Referring to the third aspect, in some implementation forms of the third aspect, the first BWP is one of the last non-dormant active uplink BWP used before the first cell was in the current inactive mode or dormant mode, the last non-dormant active downlink BWP used before the first cell was in the current inactive mode or dormant mode, the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell during the active time, the first corresponding non-dormant BWP of the first cell outside the active time, an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell during the active time, an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, or the currently active uplink BWP.

[0050] Referring to the third aspect, in some implementation forms of the third aspect, the processing unit is specifically configured to determine the amount of information bits of the first DCI format based on a first BWP and a third BWP of the first cell, where the first BWP is the last non-dormant active downlink BWP used before the first cell is currently in the inactive mode or the dormant mode, the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell within the active time, or the first corresponding non-dormant BWP of the first cell outside the active time. The third BWP is one of the following: the last non-dormant active uplink BWP used before the first cell is in the current inactive or dormant mode; the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; an uplink BWP whose identifier ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time; or the current active uplink BWP.

[0051] Referring to the third aspect, in some implementation forms of the third aspect, when the first cell is in an inactive mode, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode. If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a non-dormant BWP, the first BWP is the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode. The third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode. If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell; if the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell;If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; or if the first active downlink BWP configured for the first cell and used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time.

[0052] Referring to the third aspect, in some implementation forms of the third aspect, when the first cell is in a dormant mode, the first BWP is the last non-dormant active downlink BWP used before the first cell is in the current dormant mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell is in the current dormant mode. When the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. The BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, and when a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP becomes active. The first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP isAn uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time, or if a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time.

[0053] Referring to the third aspect, in some implementation forms of the third aspect, the processing unit is further configured to determine a first BWP ID, where the first BWP ID is an ID of the first BWP.

[0054] Referring to the third aspect, in some implementation forms of the third aspect, the processing unit is specifically configured to determine that the first BWP ID is a first preset value.

[0055] Referring to the third aspect, in some implementation forms of the third aspect, the processing unit is specifically configured to determine that the bit width of the BWP indicator field of the first cell in the first DCI format is M bits, and to determine that the first BWP ID is a maximum value corresponding to M bits, where M is a positive integer.

[0056] Referring to the third aspect, in some other implementation forms of the third aspect, when the first cell is in an inactive mode, the processing unit is specifically configured to determine that the first BWP ID is the ID of a first active BWP used when the first cell is switched from the inactive mode to the active mode, or to determine that the first BWP ID is the ID of an active BWP used before the first cell was switched from the active mode to the current inactive mode.

[0057] Referring to the third aspect, in some further implementation forms of the third aspect, when the first cell is in an inactive mode, the processing unit is specifically configured to determine that the first BWP ID is a dedicated inactive BWP ID when a dedicated inactive BWP ID is preconfigured for the first cell, or to determine that the first BWP ID is a dormant BWP ID when a dormant BWP ID is preconfigured for the first cell and a dedicated inactive BWP ID is not preconfigured for the first cell.

[0058] Referring to the third aspect, in some further implementation forms of the third aspect, when the first cell is in a dormant mode, the processing unit is specifically configured to determine that the first BWP ID is the first corresponding non-dormant BWP ID within the active time when the first corresponding non-dormant BWP ID within the active time is preconfigured for the first cell, or to determine that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time when the first corresponding non-dormant BWP ID within the active time is preconfigured for the first cell and the first corresponding non-dormant BWP ID within the active time is not preconfigured for the first cell.

[0059]

[0013] Referring to the third aspect, in some implementations of the third aspect, when the first cell is in a dormant mode, the transceiver unit is further configured to receive a second DCI format. The processing unit is specifically configured to switch an active downlink BWP of the first cell to a dormant BWP based on the second DCI format, and determine, when the second DCI format is received within an active time, that the first BWP ID is a first corresponding non-dormant BWP ID within the active time, or determine, when the second DCI format is received outside the active time, that the first BWP ID is a first corresponding non-dormant BWP ID outside the active time.

[0060] Referring to the third aspect, in some further implementation forms of the third aspect, the processing unit is specifically configured to determine that the first BWP ID is a dormant BWP ID when a dormant BWP ID is pre-configured for the first cell.

[0061]

[0013] Referring to a third aspect, in some implementations of the third aspect, the first cell operates in a time division duplex (TDD) mode, and a first DCI format is used to schedule downlink data transmissions. The transceiver unit is further configured to receive second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to the terminal device to monitor a second downlink control information (DCI) format, and the second DCI format can be used to schedule uplink data transmissions of two or more cells. The processing unit is specifically configured to: determine a quantity of information bits of the second DCI format based on a second BWP of the first cell when the first cell is in an inactive mode or a dormant mode, where an ID of the first BWP is the same as an ID of the second BWP, and monitor the second DCI format based on the quantity of information bits of the second DCI format.

[0062]

[0013] Referring to the third aspect, in some other implementation forms of the third aspect, the first cell operates in a frequency division duplex (FDD) mode, and a first DCI format is used to schedule downlink data transmissions. The transceiver unit is further configured to receive second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to the terminal device to monitor a second downlink control information (DCI) format, and the second DCI format can be used to schedule uplink data transmissions of two or more cells. The processing unit is specifically configured to, when the first cell is in a dormant mode, determine a quantity of information bits of the second DCI format based on a second BWP of the first cell, the second BWP being an active uplink BWP of the first cell, and monitor the second DCI format based on the quantity of information bits of the second DCI format.

[0063] Referring to the third aspect, in some implementation forms of the third aspect, the processing unit is specifically configured to determine the number of information bits of the first DCI format based on the configuration of a BWP whose ID is a first BWP ID in the first cell.

[0064] Referring to the third aspect, in some implementation forms of the third aspect, the processing unit is specifically configured to determine, based on a first BWP ID of the first cell, a number of information bits of a specific indicator field corresponding to the first cell in the first DCI format.

[0065] According to a fourth aspect, there is provided a downlink control information transmission apparatus. The apparatus is configured to implement the functions of the network device according to the second aspect or is a network device. The apparatus includes: a transceiver unit configured to transmit first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being usable for scheduling data transmissions of two or more cells; and a processing unit configured to determine, when the first cell is in an inactive mode or a dormant mode, a quantity of information bits of the first DCI format based on a first bandwidth portion (BWP) of the first cell. The transceiver unit is further configured to monitor the first DCI format based on the quantity of information bits of the first DCI format.

[0066] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0067] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the first BWP is one of the last non-dormant active uplink BWP used before the first cell was in the current inactive mode or dormant mode, the last non-dormant active downlink BWP used before the first cell was in the current inactive mode or dormant mode, the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell during the active time, the first corresponding non-dormant BWP of the first cell outside the active time, an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell during the active time, an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, or the currently active uplink BWP.

[0068] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the processing unit is specifically configured to determine the amount of information bits of the first DCI format based on the first BWP and the third BWP of the first cell, where the first BWP is the last non-dormant active downlink BWP used before the first cell is currently in the inactive mode or the dormant mode, the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell within the active time, or the first corresponding non-dormant BWP of the first cell outside the active time. The third BWP is one of the following: the last non-dormant active uplink BWP used before the first cell is in the current inactive or dormant mode; the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; an uplink BWP whose identifier ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time; or the current active uplink BWP.

[0069] Referring to the fourth aspect, in some implementation forms of the fourth aspect, when the first cell is in an inactive mode, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode. If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a non-dormant BWP, the first BWP is configured for the first cell and is the first active downlink BWP used when the first cell is switched from the inactive mode to the active mode. The third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from the inactive mode to the active mode. If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell; if the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP within the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time; the third BWP is configured for the first cell and is the first active uplink BWP used when the first cell is switched from an inactive mode to an active mode and is configured for the first cell;If the first active downlink BWP used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; or if the first active downlink BWP configured for the first cell and used when the first cell is switched from an inactive mode to an active mode is a dormant BWP and the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time.

[0070] Referring to the fourth aspect, in some implementation forms of the fourth aspect, when the first cell is in a dormant mode, the first BWP is the last non-dormant active downlink BWP used before the first cell is in the current dormant mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell is in the current dormant mode. When the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is the last non-dormant active uplink BWP used before the first cell is in the current dormant mode. The BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the currently active uplink BWP, and when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time, and when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, and when a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP becomes active. The first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the current active uplink BWP. When a dormant indication indicating that the first cell enters dormant mode is received within the active time, the first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP isAn uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time, or if a dormant indication indicating that the first cell enters dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time.

[0071] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the processing unit is specifically configured to determine a first BWP ID, and the first BWP ID is an ID of the first BWP.

[0072] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the processing unit is specifically configured to determine that the first BWP ID is a first preset value.

[0073] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the processing unit is specifically configured to determine that the bit width of the BWP indicator field of the first cell in the first DCI format is M bits, and to determine that the first BWP ID is a maximum value corresponding to M bits, where M is a positive integer.

[0074] Referring to the fourth aspect, in some other implementation forms of the fourth aspect, when the first cell is in an inactive mode, the processing unit is specifically configured to determine that the first BWP ID is the ID of a first active BWP used when the first cell is switched from the inactive mode to the active mode, or to determine that the first BWP ID is the ID of an active BWP used before the first cell was switched from the active mode to the current inactive mode.

[0075] Referring to the fourth aspect, in some further implementation forms of the fourth aspect, when the first cell is in an inactive mode, the processing unit is specifically configured to determine that the first BWP ID is a dedicated inactive BWP ID when a dedicated inactive BWP ID is preconfigured for the first cell, or to determine that the first BWP ID is a dormant BWP ID when a dormant BWP ID is preconfigured for the first cell and a dedicated inactive BWP ID is not preconfigured for the first cell.

[0076] Referring to the fourth aspect, in some further implementation forms of the fourth aspect, when the first cell is in a dormant mode, the processing unit is specifically configured to determine that the first BWP ID is the first corresponding non-dormant BWP ID within the active time when the first corresponding non-dormant BWP ID within the active time is pre-configured for the first cell, or to determine that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time when the first corresponding non-dormant BWP ID within the active time is pre-configured for the first cell and the first corresponding non-dormant BWP ID within the active time is not pre-configured for the first cell.

[0077] Referring to the fourth aspect, in some implementation forms of the fourth aspect, when the first cell is in a dormant mode, the transceiver unit is further configured to transmit a second DCI format and switch the active downlink BWP of the first cell to a dormant BWP based on the second DCI format. The processing unit is specifically configured to determine, when the second DCI format is transmitted within an active time, that the first BWP ID is a first corresponding non-dormant BWP ID within the active time. Alternatively, when the second DCI format is transmitted outside the active time, that the first BWP ID is a first corresponding non-dormant BWP ID outside the active time.

[0078] Referring to the fourth aspect, in some further implementation forms of the fourth aspect, the processing unit is specifically configured to determine that the first BWP ID is a dormant BWP ID when the dormant BWP ID is pre-configured for the first cell.

[0079]

[0013] Referring to the fourth aspect, in some implementations of the fourth aspect, the first cell operates in a time division duplex (TDD) mode, and a first DCI format is used to schedule downlink data transmissions. The transceiver unit is further configured to transmit second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to the terminal device to monitor a second downlink control information (DCI) format, and the second DCI format can be used to schedule uplink data transmissions of two or more cells. The processing unit is specifically configured to: determine a quantity of information bits of the second DCI format based on a second BWP of the first cell when the first cell is in an inactive mode or a dormant mode, where an ID of the first BWP is the same as an ID of the second BWP, and monitor the second DCI format based on the quantity of information bits of the second DCI format.

[0080]

[0013] Referring to the fourth aspect, in some other implementation forms of the fourth aspect, the first cell operates in a frequency division duplex (FDD) mode, and the first DCI format is used to schedule downlink data transmissions. The transceiver unit is further configured to transmit second cross-carrier scheduling configuration information, the second cross-carrier scheduling configuration information indicating to the terminal device to monitor a second downlink control information (DCI) format, and the second DCI format can be used to schedule uplink data transmissions of two or more cells. The processing unit is specifically configured to, when the first cell is in a dormant mode, determine a quantity of information bits of the second DCI format based on a second BWP of the first cell, the second BWP being an active uplink BWP of the first cell, and monitor the second DCI format based on the quantity of information bits of the second DCI format.

[0081] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the processing unit is specifically configured to determine the number of information bits of the first DCI format based on the configuration of a BWP whose ID is a first BWP ID in the first cell.

[0082] Referring to the fourth aspect, in some implementation forms of the fourth aspect, the processing unit is specifically configured to determine, based on a first BWP ID of the first cell, a number of information bits of a specific indicator field corresponding to the first cell in the first DCI format.

[0083] According to a fifth aspect, there is provided a downlink control information transmission method, the method being performed by a terminal device. The method includes receiving first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being capable of being used to simultaneously schedule data transmissions of two or more cells, and the first DCI format being capable of being used to schedule the first cell; keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from an active mode to an inactive mode, keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from a non-dormant mode to a dormant mode, keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from an inactive mode to an active mode, or keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from a dormant mode to a non-dormant mode; and monitoring the first DCI format based on the amount of information bits of the first DCI format.

[0084] According to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when the status of the scheduled cells changes, the amount of information bits of the DCI remains unchanged, which helps to accurately determine the DCI format and reduces the implementation complexity of the terminal.

[0085] Referring to the fifth aspect, in some implementation forms of the fifth aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0086] According to a sixth aspect, there is provided a downlink control information transmission method, the method being performed by a network device. The method includes: transmitting first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being capable of being used to schedule data transmissions of two or more cells, the first DCI format being capable of being used to schedule the first cell; keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from an active mode to an inactive mode, keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from a non-dormant mode to a dormant mode, keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from an inactive mode to an active mode, or keeping an amount of information bits of the first DCI format unchanged when the first cell is switched from a dormant mode to a non-dormant mode; and transmitting the first DCI format based on the amount of information bits of the first DCI format.

[0087] According to the technical solution of the present application, one DCI is used to schedule data transmission of multiple cells, and when the status of the scheduled cells changes, the amount of information bits of the DCI remains unchanged, which helps to accurately determine the DCI format and reduces the implementation complexity of network devices.

[0088] Referring to the sixth aspect, in some implementation forms of the sixth aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0089] According to a seventh aspect, there is provided a downlink control information transmission apparatus, the apparatus being configured to implement functionality of the terminal device according to the fifth aspect or being a terminal device. The apparatus includes: a transceiver unit configured to receive first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being able to be used for scheduling data transmissions of two or more cells, the first DCI format being able to be used for scheduling the first cell; and a processing unit configured to: keep an amount of information bits of the first DCI format unchanged when the first cell is switched from an active mode to an inactive mode; keep an amount of information bits of the first DCI format unchanged when the first cell is switched from a non-dormant mode to a dormant mode; keep an amount of information bits of the first DCI format unchanged when the first cell is switched from an inactive mode to an active mode; or keep an amount of information bits of the first DCI format unchanged when the first cell is switched from a dormant mode to a non-dormant mode. The transceiver unit is further configured to monitor the first DCI format based on a quantity of information bits of the first DCI format.

[0090] Referring to the seventh aspect, in some implementation forms of the seventh aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0091] According to an eighth aspect, there is provided a downlink control information transmission apparatus, the apparatus being configured to implement functionality of the network device according to the sixth aspect or being a network device. The apparatus includes: a transceiver unit configured to transmit first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being able to be used for scheduling data transmissions of two or more cells, the first DCI format being able to be used for scheduling the first cell; and a processing unit configured to: keep an amount of information bits of the first DCI format unchanged when the first cell is switched from an active mode to an inactive mode; keep an amount of information bits of the first DCI format unchanged when the first cell is switched from a non-dormant mode to a dormant mode; keep an amount of information bits of the first DCI format unchanged when the first cell is switched from an inactive mode to an active mode; or keep an amount of information bits of the first DCI format unchanged when the first cell is switched from a dormant mode to a non-dormant mode. The transceiver unit is further configured to transmit the first DCI format based on the amount of information bits of the first DCI format.

[0092] Referring to the eighth aspect, in some implementation forms of the eighth aspect, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0093] According to a ninth aspect, there is provided a communication device, comprising: a processor and an interface circuit. The interface circuit is configured to receive a signal from a communication device other than the communication device and transmit the signal to the processor, or transmit a signal from the processor to the communication device other than the communication device. The processor is configured to implement a method according to any one of the possible implementation forms of the first or fifth aspects via logic circuits or by executing code instructions.

[0094] According to a tenth aspect, there is provided a communication device, comprising: a processor and an interface circuit. The interface circuit is configured to receive a signal from a communication device other than the communication device and transmit the signal to the processor, or transmit a signal from the processor to the communication device other than the communication device. The processor is configured to implement a method according to any one of the possible implementation forms of the second or sixth aspects via logic circuits or by executing code instructions.

[0095] According to an eleventh aspect, there is provided a computer-readable storage medium having stored thereon a computer program or instructions that, when executed, implements a method according to any one of the possible implementations of the first, second, fifth, or sixth aspects.

[0096] According to a twelfth aspect, there is provided a computer program product comprising instructions that, when executed, implement a method according to any one of the possible implementations of the first or second aspect and the fifth or sixth aspect.

[0097] According to a thirteenth aspect, there is provided a computer program comprising code or instructions which, when executed, implements a method according to any one of the possible implementations of the first or second aspect and the fifth or sixth aspect.

[0098] According to a fourteenth aspect, there is provided a chip system. The chip system includes a processor and further includes a memory configured to implement a method according to any one of the possible implementations of the first aspect or the second aspect and the fifth aspect or the sixth aspect. The chip system includes a chip, or includes a chip and another discrete component.

[0099] According to a fifteenth aspect, there is provided a communication system including a terminal device and a network device.

[0100] The terminal device is configured to implement the method according to the implementation form of the first aspect, and the network device is configured to implement the method according to the implementation form of the second aspect. Alternatively, the terminal device is configured to implement the method according to the implementation form of the fifth aspect, and the network device is configured to implement the method according to the implementation form of the sixth aspect.

[0101] In a possible design, the communication system further includes another device that interacts with the terminal device or the network device in the solutions provided in the embodiments of the present application. [Brief explanation of the drawings]

[0102] [Figure 1] 1 is a diagram of the architecture of a mobile communication system to which an embodiment of the present application applies; [Figure 2] FIG. 1 is a diagram of a DRX cycle and PDCCH monitoring opportunities. [Figure 3] FIG. 1 is a diagram of a DRX cycle and radio frames. [Figure 4] 1 is a diagram of an example of a downlink control information transmission method according to the present application; [Figure 5] 1 is a diagram of a first specific example of a downlink control information transmission method according to the present application; [Figure 6] FIG. 2 is a diagram of a second example of a downlink control information transmission method according to the present application. [Figure 7]FIG. 10 is a diagram of another example of a downlink control information transmission method according to the present application. [Figure 8] FIG. 10 is a diagram of yet another example of a downlink control information transmission method according to the present application. [Figure 9] 1 is a diagram of an example of a communication device according to the present application; [Figure 10] FIG. 2 is a diagram of another example of a communication device according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0103] The following describes the technical solutions of the present application with reference to the accompanying drawings.

[0104] FIG. 1 is a diagram of the architecture of a mobile communication system to which an embodiment of the present application is applied.

[0105] As shown in Figure 1, the communication system 100 may include one or more network devices, such as the network device 101 shown in Figure 1. The communication system 100 may further include one or more terminal devices, such as the terminal device 102, the terminal device 103, and the terminal device 104 shown in Figure 1. The communication system 100 may support sidelink communication technologies, such as sidelink communication between the terminal device 102 and the terminal device 103 and sidelink communication between the terminal device 102 and the terminal device 104.

[0106] It should be understood that Figure 1 is just a diagram. The communication system may further include other network devices, for example, a core network device 105 and a wireless relay device and a wireless backhaul device not shown in Figure 1. The number of network devices and the number of terminal devices included in the mobile communication system are not limited in the embodiments of the present application.

[0107] A terminal device in an embodiment of the present application is a device having wireless transceiver functionality and may transmit signals to or receive signals from a network device. The terminal device may also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), the Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, and smart cities. A terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver functionality, a wearable device, a vehicle, an airplane, a ship, a robot, a robotic arm, a smart home device, etc. The specific technology and device configuration used by the terminal are not limited in the embodiments of the present application.

[0108] The network device in the embodiments of the present application may be a wireless access device used by a terminal to wirelessly access a communication system. The network device may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a fifth generation (5G) mobile communication system, a next generation base station in a sixth generation (6G) mobile communication system, a base station in a future mobile communication system, an access node in a Wi-Fi system, etc., and may also be a module or unit that completes part of the functions of a base station, such as a central unit (CU) or a distributed unit (DU). In this specification, the CU completes the functions of a radio resource control (RRC) protocol and a packet data convergence protocol (PDCP) of the base station, and may further complete the function of a service data adaptation protocol (SDAP). The DU completes the functions of the radio link control layer and medium access control (MAC) layer of the base station, and may also complete some or all of the functions of the physical layer. For a specific description of the above-mentioned protocol layers, please refer to the relevant technical specifications of the 3rd generation partnership project (3GPP). The network device may be a macro base station, a micro base station, an indoor base station, or a relay node, a donor node, etc. The specific technology and the specific device form used by the network device are not limited in the embodiments of this application.

[0109] The embodiments of the present application may be applied to downlink signal transmission or uplink signal transmission. In the case of downlink signal transmission, the transmitting device is a network device and the corresponding receiving device is a terminal. In the case of uplink signal transmission, the transmitting device is a terminal and the corresponding receiving device is a network device.

[0110] Communications between and among network devices and terminals may be performed over licensed spectrum, or over unlicensed spectrum, or over both licensed and unlicensed spectrum. Communications may be performed between and among network devices and terminals over spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or both spectrum below 6 GHz and above 6 GHz. The spectrum resources used between network devices and terminals are not limited in the embodiments of the present application.

[0111] In an embodiment of the present application, the functions of a network device may alternatively be performed by a module (e.g., a chip) within the network device, or may be performed by a control subsystem including the functions of the network device. The control subsystem including the functions of the network device may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, intelligent transportation, and smart city. The functions of a terminal may alternatively be performed by a module (e.g., a chip or modem) within the terminal, or may be performed by a device including the functions of the terminal.

[0112] To better explain the implementation of the present application, before the embodiments of the present application are described, concepts related to the embodiments of the present application are first described.

[0113] 1. Cell and Carrier (1) Career A carrier is a radio signal transmitted by a network device or a terminal radio frequency device and having a specific frequency, bandwidth, and standard. A carrier is an object used to carry information in wireless communication. A carrier used by a network device to transmit information is called a downlink carrier, and a carrier used by a terminal to transmit information is called an uplink carrier.

[0114] (2) Cell The coverage of each network device may be divided into one or more cells. In the current NR standard, one downlink carrier may be configured for one cell, and optionally one uplink carrier may be configured for a cell. For a terminal, the cell that serves the terminal is called the serving cell.

[0115] (3) Carrier aggregation (CA) and dual connectivity (DC) To implement high-speed transmission, NR supports carrier aggregation and dual connectivity technologies. A terminal supporting CA or DC can simultaneously transmit data on multiple carriers to improve data transmission rates. Each carrier in CA is also referred to as a component carrier (CC). In DC, a terminal establishes connections to multiple cells. These cells are classified into two groups: a master cell group (MCG) and a secondary cell group (SCG). When dual connectivity is not established, the group of cells communicating with the terminal is the MCG. The PCell in the MCG is the primary cell, the PCell in the SCG is the primary secondary cell (PSCell), and other cells in the MCG and SCG are secondary cells (SCells).

[0116] The terminal may transmit data by using a carrier aggregation technique using a PCell in an MCG and an SCell in the MCG simultaneously, or may transmit data by using a carrier aggregation technique using a PSCell in an SCG and an SCell in the SCG simultaneously.

[0117] In the subsequent description of this application, when this application is applied to an MCG, a PCell is a PCell within the MCG and an SCell is an SCell within the MCG, or when this application is applied to an SCG, a PCell is a PSCell within the SCG and an SCell is an SCell within the SCG.

[0118] 2. Bandwidth part (BWP) and bandwidth part switching (1) BWP NR introduces the concept of BWP. One BWP is a segment of contiguous frequency resources on one carrier. After a BWP is configured and activated, it is called an active BWP. In the current version of the protocol, one terminal can have only one active downlink BWP on one downlink carrier and only one active uplink BWP on one uplink carrier. Uplink data and control information transmitted by the terminal are transmitted within the active uplink BWP, and downlink data and control information are received within the active downlink BWP.

[0119] There may be one or more BWPs on one carrier, and the bandwidth of the BWPs on one carrier is less than or equal to the bandwidth of the carrier.

[0120] (2) BWP Switch To enable terminals to transmit and receive data in different BWPs at different times based on service requirements, NR supports BWP switching triggered by using DCI for scheduling data, which is carried on the physical downlink control channel (PDCCH).

[0121] The downlink BWP switching command may be carried in DCI format 1_1 or DCI format 1_2 for scheduling a physical downlink shared channel (PDSCH), and the uplink BWP switching command may be carried in DCI format 0_1 ​​or DCI format 0_2 for scheduling a physical uplink shared channel (PUSCH). After receiving the DCI, the terminal switches to the new BWP indicated by the DCI to transmit or receive data. Note that the BWP switching in this specification refers to switching between non-dormant BWPs within an active BWP.

[0122] (3) BWP in frequency division duplex (FDD) and time division duplex (TDD) The NR spectrum is classified into paired spectrum and unpaired spectrum. FDD is used in paired spectrum, and TDD is used in unpaired spectrum. In FDD mode, the uplink BWP and downlink BWP of a cell can be switched independently, and the number of uplink BWPs may be the same as or different from the number of downlink BWPs. In FDD mode, uplink BWP switching and downlink BWP switching can be performed independently. In TDD mode, the uplink BWP and downlink BWP of a cell are paired. In an uplink and downlink BWP pair, the uplink BWP and downlink BWP may have the same center frequency and different bandwidths. In FDD mode, BWP switching occurs simultaneously on the uplink and downlink, i.e., switching from a pair of BWPs to another pair of BWPs can be performed.

[0123] 3. Career hiatus Currently, a dormancy mechanism for SCells has been introduced in 3GPP Release 16 (R16). Both uplink and downlink transmissions of a dormant SCell are stopped, but the terminal still periodically measures the cell and reports cell measurement information to a network device via another non-dormant cell. Switching between dormancy and non-dormancy behavior of an SCell is implemented through BWP switching. When an SCell is indicated as dormant, the terminal switches the currently active downlink BWP to a dormant BWP in the SCell. The terminal does not need to perform PDCCH monitoring in the dormant BWP, or, when the SCell is a scheduled carrier in cross-carrier scheduling, the terminal does not need to detect the PDCCH on the corresponding scheduling carrier used to schedule the SCell. The identifier (ID) of the dormant BWP is indicated by the dormantBWP-Id (dormant BWP identifier) ​​information element in RRC signaling.

[0124] The switching of the SCell between dormancy mode and non-dormancy mode is instructed by the DCI.

[0125] (1) In connected mode, without entering connected mode discontinuous reception (C-DRX) mode (hereinafter referred to as non-C-DRX mode) or during the active time period in C-DRX mode, there are two indication methods: Scheme 1: The secondary cell dormancy indication (SCell dormancy indication) field in DCI format 0_1 ​​or 1_1 indicates whether the SCell is dormant or non-dormant. In this case, the DCI can be used to simultaneously schedule data. Method 2: A specific field in DCI format 1_1 indicates whether the SCell is dormant or non-dormant, in which case the DCI cannot be used to simultaneously schedule data. (2) During the inactive time period in C-DRX mode, there is one indication method. Method 3: The SCell dormancy indication field in DCI format 2_6 indicates whether the SCell is in dormancy or non-dormancy.

[0126] In this specification, unless otherwise specified, within active time includes two cases: when the terminal is not configured with C-DRX or does not enter C-DRX mode, and an active time period in C-DRX mode. Outside active time is an inactive time period when the terminal is in C-DRX mode.

[0127] In this application, both in-active hours and out-of-active hours are for a particular terminal.

[0128] For a cell, the network device may configure the identifier of the first corresponding non-dormant BWP within the active time by using the firstWithinActiveTimeBWP-Id information element in RRC signaling, and may configure the identifier of the first corresponding BWP outside the active time by using the firstOutsideActiveTimeBWP-Id information element. If a PDCCH indicating switching the active downlink BWP of the cell from a dormant BWP to a non-dormant BWP is received in the non-C-DRX mode of the cell or in the active time period in the C-DRX mode of the cell, the downlink BWP with ID firstWithinActiveTimeBWP-Id is activated when the state of the cell is switched from dormancy to non-dormancy. If a PDCCH indicating switching of the active downlink BWP of a cell from a dormant BWP to a non-dormant BWP is received during an inactive time period in C-DRX mode of the cell, the downlink BWP with ID firstOutsideActiveTimeBWP-Id is activated when the state of the cell switches from dormancy to non-dormancy.

[0129] There may be two terminal capabilities, namely, supporting reception of an SCell dormancy indication using DCI format 0_1 / 1_1 during active time, and supporting reception of an SCell dormancy indication using DCI format 2_6 outside active time. The terminal may support none, one, or both of the two capabilities and inform the network device of the capabilities supported by the terminal through a capability report.

[0130] In TDD mode, uplink BWP switching and downlink BWP switching are bound. Therefore, when a cell's downlink BWP is switched from the currently active downlink BWP to a dormant BWP, the uplink BWP is also switched to an uplink BWP with ID dormantBWP-Id. When a cell's downlink BWP is switched from a dormant BWP to a downlink BWP with ID firstWithinActiveTimeBWP-Id or a downlink BWP with ID firstOutsideActiveTimeBWP-Id, the uplink BWP is also switched to an uplink BWP with ID firstWithinActiveTimeBWP-Id or a downlink BWP with ID firstOutsideActiveTimeBWP-Id.

[0131] In FDD mode, uplink BWP switching and downlink BWP switching are independent. Therefore, when a cell's downlink BWP is switched from the currently active downlink BWP to a dormant BWP, the cell's uplink BWP is not switched. Similarly, when a cell's downlink BWP is switched from a dormant BWP to a downlink BWP with ID firstWithinActiveTimeBWP-Id or a downlink BWP with ID firstOutsideActiveTimeBWP-Id, the uplink BWP is not switched. Note that when an SCell enters dormancy mode, the uplink BWP is not switched, but transmissions on the uplink BWP, including data channels, control channels, sounding reference signals (SRS), physical random access channels (PRACH), etc., are stopped.

[0132] There may be two terminal capabilities, namely, supporting reception of an SCell dormancy indication using DCI format 0_1 / 1_1 during active time, and supporting reception of an SCell dormancy indication using DCI format 2_6 outside active time. The terminal may support none, one, or both of the two capabilities and inform the network device of the capabilities supported by the terminal through a capability report.

[0133] The network side device may configure dormantBWP-Id for the terminal to report that it supports at least one of the two capabilities.

[0134] For a terminal reporting a capability to support receiving an SCell dormancy indication using DCI format 0_1 / 1_1 within active time, the network device may configure firstWithinActiveTimeBWP-Id or may not configure firstWithinActiveTimeBWP-Id. For a terminal reporting a capability to support receiving an SCell dormancy indication with DCI format 2_6 outside active time, the network device may configure firstOutsideActiveTimeBWP-Id or may not configure firstOutsideActiveTimeBWP-Id.

[0135] For a terminal that does not report capability to support reception of an SCell dormancy indication using DCI format 0_1 / 1_1 during active time, the network device shall not configure firstWithinActiveTimeBWP-Id. For a terminal that does not report capability to support reception of an SCell dormancy indication using DCI format 2_6 outside active time, the network device shall not configure firstOutsideActiveTimeBWP-Id.

[0136] The following describes the C-DRX mechanism. In the C-DRX mechanism, a terminal may periodically monitor a PDCCH based on a DRX cycle configured by a network device. As shown in FIG. 2, one DRX cycle typically includes two periods: an active time and a non-active time, where the non-active time is also referred to as an outside active time. During the active time, the terminal needs to monitor the PDCCH at a PDCCH monitoring opportunity. During the non-active time, the terminal does not need to monitor the PDCCH to reduce the terminal's power consumption.

[0137] The active time includes the execution time of the on-duration timer (drx-onDurationTimer). The network device configures the length of the drx-onDurationTimer for the terminal by using radio resource control (RRC) signaling. A long DRX cycle is used as an example. A parameter drx-LongCycle for the length of the long DRX cycle, a parameter start offset (drx-StartOffset) used to determine the start subframe of the DRX cycle, and a slot offset (drx-SlotOffset) for the start subframe of the DRX cycle are further configured. When the long DRX cycle is used, the terminal starts the drx-onDurationTimer (hereinafter abbreviated as onDurationTimer) when the subframe number satisfies the following equation (1): [(SFN×10)+subframe number]modulo(drx-LongCycle)=drx-StartOffset(1)

[0138] SFN is the system frame number, and modulo represents modulo operation. A system frame is sometimes referred to as a radio frame. One radio frame is 10 ms long and may include multiple subframes, each of which includes one or more slots. As shown in Figure 3, onDurationTimer starts after the start DRX subframe of the long DRX cycle is shifted by drx-SlotOffset, and the inactive time corresponds to the DRX opportunity.

[0139] When a short DRX cycle is used, the terminal starts the drx-onDurationTimer when the subframe number satisfies the following equation (2). [(SFN×10)+subframe number]modulo(drx-ShortCycle)=(drx-StartOffset)modulo(drx-ShortCycle)(2)

[0140] That is, onDurationTimer starts after the start subframe of the short DRX cycle is shifted by drx-SlotOffset.

[0141] Although not shown in the figure, in the C-DRX mechanism, the active time may further include the execution time of the drx-InactivityTimer (inactivity timer, abbreviated as InactivityTimer), the execution time of the drx-RetransmissionTimerDL (downlink retransmission timer, abbreviated as RetransmissionTimerDL), and the execution time of the drx-RetransmisionTimerUL (uplink retransmission timer, abbreviated as RetransmisionTimerUL). The C-DRX parameters configured by the network device for the terminal by using RRC signaling may be specifically shown in Table 1, including the conditions for triggering the drx-InactivityTimer, drx-RetransmissionTimerDL, and drx-RetransmisionTimerUL. That is, the three timers are started only when the corresponding data is transmitted.

[0142] [Table 1]

[0143] The active time may further include the execution period of the ra-ContentionResolutionTimer (used for contention resolution in the random access procedure) or the msgB-ResponseWindow (used for 2-step random access contention resolution), the waiting period after the terminal transmits a scheduling request (SR) on the PUCCH, and the period during which the terminal does not receive a PDCCH indicating a new transmission after successfully receiving a random access response (RAR) for non-contention-based random access.

[0144] 4. Activating and Deactivating Cells The PCell does not support activation / deactivation, whereas the SCell supports activation / deactivation.

[0145] When a SCell is in active mode, normal SCell behavior applies, (1) SRS transmission in SCell, (2) Reporting of SCell channel state information (CSI); (3) listening and monitoring the physical downlink control channel (PDCCH) of the SCell; and (4) Includes transmission on the physical uplink control channel (PUCCH) in the SCell (if configured).

[0146] When the SCell is in inactive mode, (1) SRS is not sent in the SCell, (2) CSI of SCell is not reported, (3) No transmission is performed on the uplink shared channel (UL-SCH) in the SCell; (4) No transmission is performed on a random access channel (RACH) in the SCell; (5) The physical downlink control channel (PDCCH) is not monitored in the SCell, (6) No transmission is performed on the physical uplink control channel (PUCCH) in the SCell.

[0147] For a cell, the network device can configure the identifier of the first active downlink BWP to be used when the terminal switches from inactive mode to active mode by using the RRC information element firstActiveDownlinkBWP-Id, and can configure the identifier of the first active uplink BWP to be used when the terminal switches from inactive mode to active mode by using the RRC information element firstActiveUplinkBWP-Id. When the terminal enters active mode from inactive mode, the downlink BWP with ID firstActiveDownlinkBWP-Id and the uplink BWP with ID firstActiveUplinkBWP-Id in the cell are activated.

[0148] The configured SCell(s) may be activated and deactivated in the following manner. (1) receiving an SCell activation / deactivation medium access control (MAC) control element (CE) sent by a network device; (2) configuring a deactivation timer for SCellDeactivationTimer for each configured SCell (except for a SCell configured with a PUCCH) and deactivating the associated SCell when the timer expires; and (3) Configuring an SCellState for each configured SCell: if configured, the associated SCell is activated during SCell configuration; otherwise, the associated SCell is deactivated.

[0149] The terminal maintains a deactivation timer SCellDeactivationTimer for each SCell, and the value of SCellDeactivationTimer is the same for all SCells corresponding to the terminal. Furthermore, the value may be configured as infinity, i.e., timer-based SCell deactivation is disabled. In this case, the terminal cannot control SCell deactivation.

[0150] In the case of an SCell, when the terminal does not receive data or a PDCCH message on the SCell within the time specified by the deactivation timer, the SCell should be deactivated. This is the only case in which the terminal can automatically deactivate the SCell.

[0151] 5. Cross-career scheduling A cell in which DCI corresponding to a data channel is transmitted is called a scheduling cell or a primary scheduling cell, and a cell in which a data channel is transmitted is called a scheduled cell. When a data channel and a DCI for scheduling the data channel are transmitted within the same cell, i.e., a cell is both a scheduling cell and a scheduled cell, the cell is called a self-scheduling cell. When a data channel and a DCI for scheduling the data channel are transmitted in different cells, the cell for carrying the DCI is called a scheduling cell, and the cell for carrying the data channel is called a scheduled cell. This scheduling format is called cross-carrier scheduling (CCS). One scheduling cell may correspond to multiple scheduled cells, i.e., one scheduling cell may be used to transmit DCI for scheduling data of multiple scheduled cells.

[0152] 6. Downlink Control Information (1) Format of Downlink Control Information There are multiple DCI formats. DCI formats relevant to this application include DCI format 0_1, DCI format 0_2, DCI format 1_1, and DCI format 1_2. DCI formats 0_1 and 0_2 are used to schedule uplink data of a terminal, i.e., to schedule PUSCH transmission. DCI formats 1_1 and 1_2 are used to schedule downlink data of a terminal, i.e., to schedule PDSCH transmission.

[0153] In this application, unless otherwise specified, DCI and DCI format can be used interchangeably. For example, a first DCI may alternatively be a first DCI format, and a second DCI may alternatively be a second DCI format. For details about DCI formats, see Section 7.3.1 of 3GPP Technical Specification 38.212 V16.10.0.

[0154] Table 2 below shows some DCI formats and their uses.

[0155] [Table 2]

[0156] Currently, two new DCI formats are being discussed in the standard, as shown in Table 3 below.

[0157] [Table 3]

[0158] (2) Size of downlink control information There are two understandings of the size of downlink control information (DCI size): it includes only the size of the information bits in the DCI, and it includes the size of the information bits in the DCI and the size of the cyclic redundancy check (CRC). The size of the information bits in the DCI is also referred to as the payload size. In an NR system, the bit width of the CRC is 24. Therefore, if the size of the information bits is the same, the size of the information bits + CRC bits is the same.

[0159] When the DCI sizes are different, the terminal may use different reception schemes. To reduce the complexity of terminal reception, the number of DCI sizes is usually reduced by a DCI size alignment scheme. When the DCI sizes of two DCI formats are different, the DCI sizes need to be aligned. In a common scheme, zeros are added after the information bits of the DCI format with a shorter DCI size, or bit truncation is performed on the information bits of the DCI format with a longer DCI size, also referred to as bit padding, until the payload sizes of the two DCI formats become the same or the DCI sizes become the same.

[0160] (3) Contents of downlink control information (1) Carrier Indicator Field The carrier indicator field (CIF) is present in DCI formats 0_1 / 0_2 / 1_1 / 1_2. When cross-carrier scheduling exists between cells and multiple scheduled cells can be scheduled, the DCI carried on the PDCCH transmitted by the scheduling cell may include the CIF. Higher layer signaling is used to set different CIF values ​​for different scheduled cells. After receiving one DCI, the terminal can determine the specific scheduled cell to be scheduled by using the DCI based on the CIF value.

[0161] The carrier indicator field in DCI format 0_1 / 1_1 is 0 or 3 bits, and the configuration parameter cif-Presence for the scheduling cell indicates whether the CIF field is present. The carrier indicator field in DCI format 0_2 / 1_2 is 0, 1, 2, or 3 bits, and the network device configures carrierIndicatorSizeDCI-0-2 and carrierIndicatorSizeDCI-1-2. These two parameters are used to define the number of bits in the carrier indicator field of DCI format 0_2 / 1_2.

[0162] (2) BWP indicator field DCI formats 0_1 / 0_2 / 1_1 / 1_2 have a BWP indicator field. The BWP indicator field occupies 0, 1, or 2 bits, and the bit width occupied by the BWP indicator field is [log2(N BWP )] bit. In DCI format 0_1 / 1_1 / , N BWP,RRC is the amount of uplink BWP configured by higher layers, not including the initial uplink BWP, and in DCI format 0_2 / 1_2 / , NBWP,RRC is the amount of downlink BWP configured by higher layers, not including the initial downlink BWP.

[0163] N BWP,RRC If ≦3, N BWP =N BWP,RRC +1. In this case, the BWP indicator field corresponds to the ascending order of the upper layer parameter BWP-Id. Otherwise, N BWP =N BWP,RRC In this case, the definition of the BWP indicator field is shown in Table 4.

[0164] [Table 4]

[0165] If the terminal does not support active BWP switching performed by using DCI, the terminal shall ignore this bit field.

[0166] (3) Fields related to scheduled cells In a DCI, some fields are related to the scheduled cell. In particular, some fields in a DCI for scheduling uplink transmissions may be related to the configuration of the active uplink BWP, and some fields in a DCI for scheduling downlink transmissions may be related to the configuration of the active downlink BWP. For example, the Frequency Domain Resource Assignment field: the size and content of the field in a DCI for scheduling uplink transmissions is related to the configuration (bandwidth and center frequency offset) of the active uplink BWP of the scheduled cell, and the size and content of the field in a DCI for scheduling downlink transmissions is related to the configuration (bandwidth and center frequency offset) of the active downlink BWP of the scheduled cell.

[0167] In particular, some fields in the DCI for scheduling downlink transmissions may be associated with the configuration of an active uplink BWP. For example, in the Physical Uplink Control Channel Resource Indicator (PUCCH resource indicator) field, the number of bits of the field may be associated with the parameter numberOfBitsForPUCCH-ResourceIndicatorDCI-1-2 in the configuration of an active uplink BWP. For example, in the Physical Downlink Shared Channel to Hybrid Automatic Repeat Request Timing Indicator (PDSCH-to-HARQ_feedback timing indicator) field, the number of bits of the field may be associated with the parameter DL-DataToUL-ACK-DCI-1-2 in the configuration of an active uplink BWP. In particular, some fields in the DCI for scheduling uplink transmissions may be associated with the configuration of an active downlink BWP. For example, in the PUCCH resource indicator field, the number of bits of the field may be associated with the parameter numberOfBitsForPUCCH-ResourceIndicatorDCI-1-2 in the configuration of an active uplink BWP. In another example, in the DSCH-to-HARQ_feedback timing indicator field, the number of bits in the field may be related to the parameter DL-DataToUL-ACK-DCI-1-2 in the configuration of the active uplink BWP.

[0168] (4) Fields in DCI formats 0_X and 1_X For DCI format 0_X / 1_X, which can be used to schedule multiple cells, when the cells that can be scheduled by using one DCI format 0_X or 1_X include a first cell, the bit widths of some DCI fields may be associated with the BWP configuration of the first cell. DCI format 1_X is associated with the downlink target BWP configuration of the first cell, and DCI format 0_X is associated with the uplink target BWP configuration of the first cell. In a joint indication manner, some DCI fields may indicate information separately for each cell in all scheduled cells, for only the first cell, or for a cell group including the first cell, where the cell group is herein a subset of cells that can be scheduled by using one DCI format 0_X or 1_X.

[0169] Specifically, this may include the following: (a) New data indicator per TB; (b) Redundancy version per TB, (c) Precoding information and number of layers, where for DCI format 0_X, the bit width is determined based on the txConfig configuration in the uplink target BWP of the first cell; (d) Phase Tracking Reference Signal-Demodulation Reference Signal Association (PTRS-DMRS association), where for DCI format 0_X, if PTRS-UplinkConfig is not configured in the uplink target BWP of the first cell, this field is 0 bit, or if PTRS-UplinkConfig is configured in the uplink target BWP of the first cell, this field is 2 bits; (e) Antenna port(s), (f) sounding reference signal indication (SRI), and (g) Physical resource block bundling size indicator (PRB bundling size indicator), where for DCI format 1_X, the bit width is determined if prb-BundlingType is configured in the downlink target BWP of the first cell. The target BWP has the first BWP ID of the first cell that needs to be determined in this application.

[0170] In previous protocols, one DCI is used to schedule only one scheduled cell. When a scheduled cell is deactivated, the network side device does not need to send a DCI for scheduling the scheduled cell. Therefore, there is no problem in setting the BWP indicator field in the DCI for scheduling the deactivated cell. Therefore, in existing protocols, the BWP, i.e., the BWP ID, does not need to be configured for the deactivated mode. However, if one DCI needs to be used to schedule multiple cells, the carrier indicator field may not indicate all cell combinations to reduce the overhead of the carrier indicator field. Therefore, for the two new DCI formats shown in Table 3, the CIF field needs to be reset. For example, as shown in Table 5 below, two bits may be set to indicate four carrier combinations.

[0171] [Table 5]

[0172] In the example of Table 5, if carrier 3 is set to be deactivated, when the network device needs to schedule CC0, CC1, and CC2 simultaneously, the CIF in the DCI is set to 3, i.e., 11. In this case, how to set the BWP ID of carrier 3 and how to set another dedicated field corresponding to carrier 3 is an urgent problem to be solved.

[0173] Therefore, when one DCI is used to schedule multiple scheduled cells and cells in inactive mode / dormancy mode exist among the scheduled cells, how to set the BWP IDs and corresponding specific indicator fields of these scheduled cells becomes an urgent problem to be solved.

[0174] On this basis, the present application provides a downlink control information transmission method and apparatus to accurately determine the DCI format and improve information transmission performance.

[0175] The following describes in detail the technical solution of the present application by using the interaction between a terminal and a network device as an example. The terminal may be the terminal in Figure 1 (for example, the terminal device 102, the terminal device 103, or the terminal device 104), and the network device may be the network device 101 in Figure 1.

[0176] FIG. 4 is a schematic flowchart of an example of a downlink control information transmission method according to the present application.

[0177] S410: A terminal receives first cross-carrier scheduling configuration information, where the first cross-carrier scheduling configuration information indicates the terminal to monitor a first downlink control information DCI format.

[0178] In response, the network device transmits first cross-carrier scheduling configuration information.

[0179] Optionally, the first DCI format may be used to simultaneously schedule data transmissions of two or more cells.

[0180] Optionally, the first DCI format can be used to simultaneously schedule uplink and / or downlink data transmissions of two or more cells. For example, the first DCI format can be used to simultaneously schedule downlink data channels of two or more cells, i.e., simultaneously schedule at least one downlink data channel in each of two or more cells. For example, the first DCI format can be used to simultaneously schedule uplink data channels of two or more cells, i.e., simultaneously schedule at least one uplink data channel in each of two or more cells. For example, the first DCI format can be used to simultaneously schedule uplink and / or downlink data channels of two or more cells, i.e., simultaneously schedule at least one data channel in each of two or more cells, which may be an uplink data channel or a downlink data channel.

[0181] S420: When the first cell is in an inactive mode or a dormant mode, determine an amount of information bits of a first DCI format based on a first BWP of the first cell.

[0182] The first cell may be one of the two or more cells, or may not be any one of the two or more cells. The first indicator field in the first DCI format indicates a scheduled cell or a scheduled cell group scheduled in the first DCI format. A scheduled cell group means two or more scheduled cells. Different values ​​of the first indicator field in the first DCI format can indicate different scheduled cells or scheduled cell groups. Optionally, a value of the first indicator field indicates a scheduling cell group, and another value indicates a scheduled cell. Optionally, a value of the first indicator field indicates a first scheduled cell group, and another value indicates a second scheduled cell group, where the first scheduled cell group is different from the second scheduled cell group. The first cell may be a cell in the scheduled cell group indicated by the value of the first indicator field, or may be a scheduled cell indicated by the value of the first indicator field. Optionally, the first cross-carrier scheduling configuration information further indicates the terminal to monitor the first DCI format in the second cell. The first cell is different from the second cell. The first indicator field may be a carrier indicator field or a carrier group indicator field. Determining the amount of information bits of the first DCI format based on the first BWP of the first cell can also be understood as determining the amount of bits of some DCI fields in the first DCI format based on the configuration of the first BWP to determine the amount of information bits of the first DCI format. A DCI field in the first DCI format whose number of bits is determined based on the configuration of the first BWP is referred to as a specific indicator field corresponding to the first cell.In the present application, the specific indicator field corresponding to the first cell includes, but is not limited to, a DCI field of a first DCI format that separately indicates information for each cell in a cell group including the first cell in a joint indication manner, a DCI field that indicates information for only the first cell, or a DCI field that indicates information for a cell group including the first cell, and a BWP ID field of each cell. In the present application, the amount of information bits of the first DCI format may alternatively be the DCI size of the first DCI format, or alternatively may be the payload size of the first DCI format, or alternatively may be the sum of the amount of information bits and the amount of CRC bits of the first DCI format, or alternatively may be the sum of the payload size and CRC size of the first DCI format.

[0183] Optionally, the first BWP is the last non-dormant active uplink BWP used before the first cell is in the current inactive or dormant mode, the last non-dormant active downlink BWP used before the first cell is in the current inactive or dormant mode, the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, the first corresponding non-dormant BWP of the first cell within the active time, the first corresponding non-dormant BWP of the first cell outside the active time, an uplink BWP whose identifier ID is the same as the identifier ID of the first corresponding non-dormant BWP of the first cell within the active time, an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time, or the currently active uplink BWP.

[0184] In this embodiment of the present application, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells. When the first cell is in inactive mode, the following cases of the first BWP are possible:

[0185] In a first possible case, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode. In this way, when the first cell switches from the active mode to the inactive mode, the amount of information bits of the first DCI format is not changed. In other words, there is no case where the amount of information bits of the first DCI format is changed because the first cell switches from the active mode to the inactive mode. Therefore, the complexity of the implementation of the UE can be reduced.

[0186] In a second possible case, when the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a non-dormant BWP, the first BWP is configured for the first cell and is used when the first cell switches from the inactive mode to the active mode. In this way, when the first cell switches from the current inactive mode to the active mode, the amount of information bits in the first DCI format is not changed. In other words, there is no case where the amount of information bits in the first DCI format is changed because the first cell switches from the inactive mode to the active mode in the future. Therefore, the complexity of the implementation of the UE can be reduced.

[0187] In a third possible case, when the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0188] In a fourth possible case, when the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0189] In a fifth possible case, when the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP outside the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0190] In a sixth possible case, when the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP outside the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0191] In this embodiment of the present application, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells. When the first cell is in an inactive mode, the following cases of the first BWP are possible:

[0192] In a first possible case, the first BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode. In this way, when the first cell switches from the active mode to the inactive mode, the amount of information bits of the first DCI format is not changed. In other words, there is no case where the amount of information bits of the first DCI format is changed because the first cell switches from the active mode to the inactive mode. Therefore, the complexity of the implementation of the UE can be reduced.

[0193] In a second possible case, the first BWP is configured for the first cell and is the first active uplink BWP to be used when the first cell switches from the inactive mode to the active mode. In this way, when the first cell switches from the current inactive mode to the active mode, the amount of information bits of the first DCI format is not changed. In other words, there is no case where the amount of information bits of the first DCI format is changed because the first cell switches from the inactive mode to the active mode in the future. Therefore, the complexity of the implementation of the UE can be reduced.

[0194] In a third possible case, the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time. Furthermore, this solution can be applied when the first cell operates in time division duplex (TDD) mode. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0195] In a fourth possible case, the first active downlink BWP configured for the first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, and if the first corresponding non-dormant BWP outside the active time is not pre-configured for the first cell, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time. Furthermore, this solution can be applied when the first cell operates in time division duplex (TDD) mode. In this way, the first BWP is determined based on higher layer configuration, and the implementation is simple.

[0196] In this embodiment of the present application, the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells. When the first cell is in idle mode, the following cases of the first BWP are possible:

[0197] In a first possible case, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current dormant mode. In this way, when the first cell switches from the non-dormant mode to the dormant mode, the amount of information bits in the first DCI format is not changed. In other words, no case occurs in which the amount of information bits in the first DCI format is changed because the first cell switches from the non-dormant mode to the dormant mode. Therefore, the complexity of the implementation of the UE can be reduced.

[0198] In the second possible case, when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0199] In the third possible case, when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0200] In the fourth possible case, when the first corresponding non-dormant BWP outside the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0201] In the fifth possible case, when the first corresponding non-dormant BWP outside the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0202] In a sixth possible case, when a dormancy indication indicating that the first cell enters a dormant mode is received within the active time, the first BWP is the first corresponding non-dormant BWP within the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the time when the dormant indication is sent.

[0203] In a seventh possible case, when a dormancy indication indicating that the first cell enters a dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the time when the dormant indication is sent.

[0204] In an eighth possible case, when the dormancy indication indicating that the first cell enters a dormant mode is carried in a DCI format that is DCI format 0_1 ​​or DCI format 1_1, the first BWP is the first corresponding non-dormant BWP within the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the DCI format for transmitting the dormant indication.

[0205] In a ninth possible case, when the dormancy indication indicating that the first cell enters a dormant mode is carried in a DCI format that is DCI format 2_6, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the DCI format for transmitting the dormant indication.

[0206] In this embodiment of the present application, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells. When the first cell is in idle mode, the following cases of the first BWP are possible:

[0207] In a first possible case, the first BWP is the last non-dormant active uplink BWP used before the first cell entered the current dormant mode. In this way, when the first cell switches from the non-dormant mode to the dormant mode, the amount of information bits in the first DCI format is not changed. In other words, no case occurs in which the amount of information bits in the first DCI format is changed because the first cell switches from the non-dormant mode to the dormant mode. Therefore, the complexity of the implementation of the UE can be reduced.

[0208] In the second possible case, the first BWP is the currently active uplink BWP. Furthermore, this solution can be applied when the first cell operates in frequency division duplex (FDD) mode. In FDD mode, the active uplink BWP switching and the active downlink BWP switching are independent.

[0209] In the third possible case, when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time. In this way, the first BWP is determined based on the upper layer configuration, and the implementation is simple.

[0210] In the fourth possible case, when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0211] In the fifth possible case, when the first corresponding non-dormant BWP outside the active time is pre-configured for the first cell, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP outside the active time of the first cell. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0212] In the sixth possible case, when the first corresponding non-dormant BWP outside the active time is not pre-configured for the first cell, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell within the active time. In this way, the first BWP is determined based on the higher layer configuration, and the implementation is simple.

[0213] In a seventh possible case, when a dormancy indication indicating that the first cell enters a dormant mode is received within the active time, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell within the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the time when the dormant indication is transmitted. In this way, the network device may control the amount of information bits of the first DCI format based on the time when the dormant indication is transmitted.

[0214] In an eighth possible case, when a dormancy indication indicating that the first cell enters a dormant mode is received outside the active time, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the time when the dormant indication is transmitted. In this way, the network device may control the amount of information bits of the first DCI format based on the time when the dormant indication is transmitted.

[0215] In a ninth possible case, when the dormancy indication indicating that the first cell enters a dormant mode is carried in a DCI format that is DCI format 0_1 ​​or DCI format 1_1, the first BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the DCI format for transmitting the dormant indication.

[0216] In a tenth possible case, when a dormancy indication indicating that a first cell enters a dormant mode is carried in a DCI format that is DCI format 2_6, the first BWP is an uplink BWP whose ID is the same as the ID of a first corresponding non-dormant BWP of the first cell outside the active time. In this way, the network device may control the amount of information bits of the first DCI format based on the DCI format for transmitting the dormant indication.

[0217] In this specification, the non-dormant active uplink BWP of the first cell is the active uplink BWP used when the first cell is in active mode and non-dormant mode, or the active uplink BWP used when the first cell is in active mode.

[0218] Optionally, determining the amount of information bits of the first DCI format based on the first BWP of the first cell may further include determining the amount of information bits of the first DCI format based on the first BWP and a third BWP of the first cell, where the first BWP is a last non-dormant active downlink BWP used before the first cell is currently in the inactive mode or the dormant mode, a first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, a first corresponding non-dormant BWP of the first cell within the active time, or a first corresponding non-dormant BWP of the first cell outside the active time. The third BWP is one of the following: the last non-dormant active uplink BWP used before the first cell is in the current inactive or dormant mode; the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; an uplink BWP whose identifier ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time; or the current active uplink BWP.

[0219] In this embodiment of the present application, when the first cell is in an inactive mode, there may be the following several cases of the first BWP and the third BWP:

[0220] In a first possible case, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode. In this way, when the first cell switches from the active mode to the inactive mode, the amount of information bits in the first DCI format is not changed. In other words, there is no case where the amount of information bits in the first DCI format is changed because the first cell switches from the active mode to the inactive mode. Therefore, the complexity of the implementation of the UE can be reduced.

[0221] In a second possible case, when the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a non-dormant BWP, the first BWP is the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode. In this way, when the first cell switches from the current inactive mode to the active mode, the amount of information bits in the first DCI format is not changed. In other words, there is no case where the amount of information bits in the first DCI format is changed because the first cell switches from the inactive mode to the active mode in the future. Therefore, the complexity of the implementation of the UE can be reduced.

[0222] In a third possible case, when the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode.

[0223] In addition, if the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, the amount of information bits of the first DCI format cannot be determined based on the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode. Therefore, in this case, at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell. Therefore, in the fourth possible case, when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. In this way, the implementation is simple. Alternatively, it may be as follows. When the first active downlink BWP configured for a first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, and the first corresponding non-dormant BWP outside of active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of active time. Because only downlink BWPs can be configured as dormant BWPs, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in inactive mode and the first active downlink BWP configured for the first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, the third BWP is the first active uplink BWP configured for the first cell and used when the first cell switches from inactive mode to active mode. Furthermore, this solution can be applied when the first cell operates in frequency division duplex FDD mode, since in FDD mode, the active uplink BWP switching and the active downlink BWP switching are independent.

[0224] In a fifth possible case, the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and when the first corresponding non-dormant BWP within the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode.

[0225] If the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, the amount of information bits of the first DCI format cannot be determined based on the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode. In this case, at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell. Therefore, in the sixth possible case, when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, i.e., when the first corresponding non-dormant BWP outside the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the implementation is simple. Alternatively, it may be as follows: When the first active downlink BWP configured for a first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, and the first corresponding non-dormant BWP outside the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP during the active time. In addition, because only downlink BWPs can be configured as dormant BWPs, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in the dormant mode and the first active downlink BWP configured for the first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, the third BWP is the first active uplink BWP configured for the first cell and used when the first cell switches from inactive mode to active mode.Furthermore, this solution can be applied when the first cell operates in frequency division duplex FDD mode, since in FDD mode, the active uplink BWP switching and the active downlink BWP switching are independent.

[0226] In a seventh possible case, when the first active downlink BWP configured for the first cell and used when the first cell is switched from inactive mode to active mode is a dormant BWP, and the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in the active time.

[0227] If the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, the amount of information bits of the first DCI format cannot be determined based on the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode. In this case, at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell. Therefore, in the eighth possible case, when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. In this way, the implementation is simple. Similarly, alternatively, it may alternatively be as follows. When the first active downlink BWP configured for a first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, and the first corresponding non-dormant BWP outside of active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of active time. Because only downlink BWPs can be configured as dormant BWPs, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in inactive mode and the first active downlink BWP configured for the first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during active time. Alternatively, it may be as follows:When the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP outside the active time is pre-configured for the first cell, the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time. Furthermore, since in the TDD mode, the active uplink BWP switching and the active downlink BWP switching are bound and have the same BWP ID, this solution can be applied when the first cell operates in the time division duplex TDD mode.

[0228] In a ninth possible case, when the first active downlink BWP configured for the first cell and used when the first cell is switched from inactive mode to active mode is a dormant BWP, and the first corresponding non-dormant BWP within the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell within the active time.

[0229] If the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, the amount of information bits of the first DCI format cannot be determined based on the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode. In this case, at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell. Therefore, in the tenth possible case, when the first corresponding non-dormant BWP in the active time is not pre-configured for the first cell, i.e., when the first corresponding non-dormant BWP outside the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the implementation is simple. Alternatively, it may be as follows: When the first active downlink BWP configured for a first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, and the first corresponding non-dormant BWP outside the active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP during the active time. Because only downlink BWPs can be configured as dormant BWPs, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in the inactive mode and the first active downlink BWP configured for the first cell and used when the first cell switches from inactive mode to active mode is a dormant BWP, the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time. Alternatively, it may be as follows:When the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP outside the active time is pre-configured for the first cell, the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time. Furthermore, since in the TDD mode, the active uplink BWP switching and the active downlink BWP switching are bound and have the same BWP ID, this solution can be applied when the first cell operates in the time division duplex TDD mode.

[0230] In this embodiment of the present application, when the first cell is in dormant mode, there may be the following several cases of the first BWP and the third BWP:

[0231] In a first possible case, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current dormant mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current dormant mode. In this way, when the first cell switches from the non-dormant mode to the dormant mode, the amount of information bits in the first DCI format is not changed. In other words, no case occurs in which the amount of information bits in the first DCI format is changed because the first cell switches from the non-dormant mode to the dormant mode. Therefore, the complexity of the implementation of the UE can be reduced.

[0232] In the second possible case, when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is the currently active uplink BWP.

[0233] When the first cell is in a dormant mode and at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. Thus, the implementation is simple. Similarly, alternatively, the first BWP may be the first corresponding non-dormant BWP outside the active time when the first corresponding non-dormant BWP outside the active time is preconfigured for the first cell. Additionally, since only downlink BWPs can be configured as dormant BWPs, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in a dormant mode, the third BWP may be the currently active uplink BWP. Furthermore, this solution can be applied when the first cell operates in frequency division duplex FDD mode, since in FDD mode, the active uplink BWP switching and the active downlink BWP switching are independent.

[0234] In a third possible case, when the first corresponding non-dormant BWP in the active time is not preconfigured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is the currently active uplink BWP. When the first cell is in dormant mode and at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell, the first corresponding non-dormant BWP in the active time is not preconfigured for the first cell, i.e., when the first corresponding non-dormant BWP outside the active time is preconfigured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. Thus, the implementation is simple. Alternatively, it may be as follows: When the first corresponding non-dormant BWP outside the active time is not preconfigured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. In addition, because only the downlink BWP can be configured as a dormant BWP, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in dormant mode, the third BWP can be the currently active uplink BWP. Furthermore, in FDD mode, the active uplink BWP switching and the active downlink BWP switching are independent, so this solution can be applied when the first cell operates in frequency division duplex FDD mode.

[0235] In a fourth possible case, when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP in the active time for the first cell. Because the first cell is in dormant mode and at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell, when the first corresponding non-dormant BWP in the active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. In this way, the implementation is simple. Alternatively, the following may be alternatively implemented: When the outside-active time of the first corresponding non-dormant BWP is pre-configured for the first cell, the first BWP is the outside-active time of the first corresponding non-dormant BWP. In addition, since only downlink BWPs can be configured as dormant BWPs, when an active downlink BWP is dormant, the active uplink BWP is not dormant. Therefore, when the first cell is in dormant mode, the third BWP can be an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time. Furthermore, in TDD mode, the active uplink BWP switching and the active downlink BWP switching are bound and the BWP IDs are the same, so this solution can be applied when the first cell operates in time division duplex TDD mode.

[0236] In a fifth possible case, when the first corresponding non-dormant BWP in the active time is not preconfigured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP in the first cell outside the active time. When the first cell is in a dormant mode and at least one of the first corresponding non-dormant BWP in the active time and the first corresponding non-dormant BWP outside the active time is specifically configured for the first cell, the first corresponding non-dormant BWP in the active time is not preconfigured for the first cell, i.e., when the first corresponding non-dormant BWP outside the active time is preconfigured for the first cell, the first BWP is the first corresponding non-dormant BWP outside the active time. Thus, the implementation is simple. Alternatively, it may be as follows: When the first corresponding non-dormant BWP outside the active time is not preconfigured for the first cell, the first BWP is the first corresponding non-dormant BWP in the active time. In addition, since only downlink BWPs can be configured as dormant BWPs, when an active downlink BWP is dormant, the active uplink BWP is not dormant. Therefore, when the first cell is in dormant mode, the third BWP can be an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time. Furthermore, in TDD mode, the active uplink BWP switching and the active downlink BWP switching are bound and the BWP IDs are the same, so this solution can be applied when the first cell operates in time division duplex TDD mode.

[0237] In a sixth possible case, when a dormancy indication indicating that the first cell is to enter a dormant mode is received within the active time, the first BWP is the first corresponding non-dormant BWP within the active time, and the third BWP is the currently active uplink BWP. Whether the first BWP is the first corresponding non-dormant BWP within the active time or the first corresponding non-dormant BWP outside the active time is determined based on whether the dormant indication indicating that the first cell is to enter a dormant mode is received within the active time or outside the active time. In this way, the scheduling flexibility of the network device can be improved, and the network device can control the amount of information bits of the first DCI format based on the time when the dormant indication is transmitted. Alternatively, it may be as follows: When the dormant indication indicating that the first cell is to enter a dormant mode is carried in a DCI format that is DCI format 0_1 ​​or DCI format 1_1, the first BWP is the first corresponding non-dormant BWP within the active time. In this way, the flexibility of base station scheduling can be improved, and the base station can control the amount of information bits in the first DCI format based on the DCI format for transmitting the dormant instruction. Because only the downlink BWP can be configured as a dormant BWP, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in dormant mode, the third BWP can be the currently active uplink BWP. Furthermore, in FDD mode, active uplink BWP switching and active downlink BWP switching are independent, so this solution can be applied when the first cell operates in frequency division duplex FDD mode.

[0238] In a seventh possible case, when a dormant indication indicating that the first cell enters dormant mode is received outside of the active time, the first BWP is the first corresponding non-dormant BWP outside of the active time, and the third BWP is the currently active uplink BWP.

[0239] Whether the first BWP is the first corresponding non-dormant BWP within the active time or the first corresponding non-dormant BWP outside the active time is determined based on whether the dormant instruction indicating that the first cell is to enter dormant mode is received within the active time or outside the active time. In this way, the scheduling flexibility of the base station can be improved, and the base station can control the amount of information bits of the first DCI based on the time when the dormant instruction is transmitted. Alternatively, it may be as follows: When the dormant instruction indicating that the first cell is to enter dormant mode is transmitted in a DCI format that is DCI format 2_6, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the scheduling flexibility of the base station can be improved, and the base station can control the amount of information bits of the first DCI format based on the DCI format for transmitting the dormant instruction. In addition, because only a downlink BWP can be configured as a dormant BWP, when an active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in dormant mode, the third BWP can be the current active uplink BWP. Furthermore, in FDD mode, the active uplink BWP switching and the active downlink BWP switching are independent, so this solution can be applied when the first cell operates in frequency division duplex FDD mode.

[0240] In an eighth possible case, when a dormant indication indicating that the first cell is to enter a dormant mode is received during the active time, the first BWP is the first corresponding non-dormant BWP during the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time. Whether the first BWP is the first corresponding non-dormant BWP during the active time or the first corresponding non-dormant BWP outside the active time is determined based on whether the dormant indication indicating that the first cell is to enter a dormant mode is received during the active time or outside the active time. In this way, the scheduling flexibility of the base station can be improved, and the base station can control the amount of information bits of the first DCI based on the time when the dormant indication is transmitted. Alternatively, it may be as follows: When the dormant indication indicating that the first cell is to enter a dormant mode is carried in a DCI format that is DCI format 0_1 ​​or DCI format 1_1, the first BWP is the first corresponding non-dormant BWP during the active time. In this way, the scheduling flexibility of the base station can be improved, and the base station can control the amount of information bits of the first DCI format based on the DCI format for transmitting the dormant instruction. In addition, because only the downlink BWP can be configured as a dormant BWP, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in dormant mode, the third BWP can be an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time. Furthermore, in TDD mode, the active uplink BWP switching and the active downlink BWP switching are bound and have the same BWP ID, so this solution can be applied when the first cell operates in time division duplex TDD mode.

[0241] In a ninth possible case, when a dormancy indication indicating that the first cell is to enter a dormant mode is received outside the active time, the first BWP is the first corresponding non-dormant BWP outside the active time, and the third BWP is an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside the active time. Whether the first BWP is the first corresponding non-dormant BWP within the active time or the first corresponding non-dormant BWP outside the active time is determined based on whether the dormant indication indicating that the first cell is to enter a dormant mode is received within the active time or outside the active time. In this way, the scheduling flexibility of the base station can be improved, and the base station can control the amount of information bits of the first DCI based on the time when the dormant indication is transmitted. Alternatively, it may be as follows: When the dormant indication indicating that the first cell is to enter a dormant mode is carried in a DCI format that is DCI format 2_6, the first BWP is the first corresponding non-dormant BWP outside the active time. In this way, the scheduling flexibility of the base station can be improved, and the base station can control the amount of information bits of the first DCI format based on the DCI format for transmitting the dormant instruction. In addition, because only the downlink BWP can be configured as a dormant BWP, when the active downlink BWP is a dormant BWP, the active uplink BWP is not a dormant BWP. Therefore, when the first cell is in dormant mode, the third BWP can be an uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell during the active time. Furthermore, in TDD mode, the active uplink BWP switching and the active downlink BWP switching are bound and have the same BWP ID, so this solution can be applied when the first cell operates in time division duplex TDD mode.

[0242] S430: Monitor the first DCI format based on the amount of information bits of the first DCI format.

[0243] The terminal monitoring one DCI format means that the terminal attempts to perform blind detection on the control channel on the time-frequency resource corresponding to the control channel candidate, and performs decoding and CRC check based on the amount of information bits of the DCI format. If the check is successful, it is considered that one DCI format has been successfully received on the control channel candidate, or if the check is unsuccessful, it is considered that no control channel has been detected on the control channel candidate.

[0244] Optionally, when the first DCI format needs to be matched with the DCI size of another DCI format, the terminal monitoring the first DCI format based on the amount of information bits of the first DCI format may be understood as the terminal determining the DCI size of the first DCI format based on the amount of information bits of the first DCI format and the amount of information bits of the other DCI format, and monitoring the first DCI format based on the DCI size of the first DCI format. Correspondingly, the network device transmitting the first DCI format based on the amount of information bits of the first DCI format may be understood as the network device determining the DCI size of the first DCI format based on the amount of information bits of the first DCI format and the amount of information bits of the other DCI format, and transmitting the first DCI format based on the DCI size of the first DCI format. In the present application, when DCI size matching needs to be performed for a first DCI format and another DCI format, the amount of information bits of the first DCI format is the amount of information bits of the first DCI format before DCI size matching, the amount of information bits of the first DCI format before bit padding, or the amount of information bits of the first DCI format before bit truncation.

[0245] Optionally, when the first cell operates in a time division duplex TDD mode, the first DCI format is used to schedule downlink data transmissions. The method further includes receiving second cross-carrier scheduling information, the second cross-carrier scheduling information indicating to the terminal to monitor a second downlink control information DCI format, where the second DCI format can be used to schedule uplink data transmissions of two or more cells; and when the first cell is in an inactive mode or a dormant mode, determining a quantity of information bits of the second DCI format based on a second BWP ID of the first BWP, where the ID of the first BWP is identical to the ID of the second BWP; and monitoring the second DCI format based on the quantity of information bits of the second DCI format. In the present application, the first cell operating in a time division duplex TDD mode may alternatively mean that the first cell operates in an unpaired spectrum.

[0246] Optionally, when the first cell operates in a frequency division duplex (FDD) mode, the first DCI format is used to schedule downlink data transmissions. The terminal may further receive second cross-carrier scheduling information, where the second cross-carrier scheduling information indicates to the terminal to monitor a second downlink control information (DCI) format, which can be used to schedule uplink data transmissions of two or more cells. When the first cell is in a dormant mode, the terminal determines a quantity of information bits of the second DCI format based on a second BWP ID of the first cell, the second BWP is an active uplink BWP of the first cell, and monitors the second DCI format based on the quantity of information bits of the second DCI format. In the present application, the first cell operating in a time division duplex (FDD) mode may alternatively mean that the first cell operates in paired spectrum.

[0247] Optionally, when the first cell operates in a frequency division duplex (FDD) mode, the first DCI format is used to schedule downlink data transmission. When the first cell is in a dormant mode (or the active downlink BWP of the first cell is a dormant BWP), if a DCI for switching the first cell from a non-dormant mode to a dormant mode is received within an active time or the DCI format for switching the first cell from a non-dormant mode to a dormant mode is DCI format 0_1 ​​or DCI format 1_1, the terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID within the active time, or if a DCI for switching the first cell from a non-dormant mode to a dormant mode is received outside the active time or the DCI format for switching the first cell from a non-dormant mode to a dormant mode is DCI format 2_6, the terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time. In addition, the terminal may further receive second cross-carrier scheduling configuration information, which indicates to the terminal to monitor a second downlink control information (DCI) format, where the second DCI format can be used to schedule uplink data transmissions of two or more cells, and when the first cell is in a dormant mode, determine a quantity of information bits of the second DCI format based on a second BWP of the first cell, determine that the second BWP is an active uplink BWP of the first cell, and monitor the second DCI format based on the quantity of information bits of the second DCI format. In the present application, the process and method for determining the quantity of information bits of the second DCI format based on the second BWP are similar to the process and method for determining the quantity of information bits of the first DCI format based on the first BWP. Details will not be described again in this specification.

[0248] According to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when the first cell is in active mode or idle mode, the format of the DCI is determined based on the BWP ID of the first cell, which is helpful to accurately determine the DCI format and improve information transmission performance.

[0249] Optionally, in this embodiment of the present application, before determining the number of information bits of the first DCI format based on the first BWP of the first cell, the network device and the terminal may first determine the first BWP ID of the first cell, i.e., the sequence number of the first BWP. The first BWP ID is the ID of the first BWP, i.e., the sequence number of the first BWP. Specifically, there may be three schemes (Scheme A, Scheme B, and Scheme C) shown in Figure 5.

[0250] Method A: S501: A network device determines that a first BWP ID of a first cell is an actual BWP ID. S502: The terminal determines that the first BWP ID of the first cell is the actual BWP ID.

[0251] It should be understood that in this application, the actual BWP ID represents a type of BWP ID (including, but not limited to, the BWP IDs in Schemes 1 to 11 below) and should not be used as a limitation on this application. An actual BWP is specifically a BWP configured with a BWP bandwidth or subcarrier spacing SCS. In other words, if a BWP is configured with either a BWP bandwidth or subcarrier spacing SCS, the BWP can be considered an actual BWP. Correspondingly, for ease of explanation, the ID of an actual BWP may be referred to as an actual BWP ID.

[0252] It should be further understood that in scheme A, when the carrier indicator field or carrier group indicator field in the first DCI format indicates the first cell, the BWP indicator field in the first DCI format indicates that the BWP of the first cell is the first BWP or indicates that the BWP ID of the first cell is the first BWP ID.

[0253] In this embodiment of the present application, the manner in which the network device determines the first BWP ID of the first cell as the actual BWP ID is the same as the manner in which the terminal determines the first BWP ID of the first cell as the actual BWP ID. For simplicity, the following only uses the terminal as an example for specific description. Specifically, as shown in FIG. 6, 11 schemes (Scheme 1 to Scheme 11 in FIG. 6) may be included.

[0254] Method 1: This scheme may be performed regardless of whether the first cell is in an inactive mode or a dormant mode. S601: A network device determines that a first BWP ID of a first cell is a first preset value. S602: The terminal determines that the first BWP ID of the first cell is a first preset value.

[0255] The first preset value may be a protocol-specific or preset value, for example, 0 or 1. Optionally, the first DCI format is used for scheduling uplink data transmissions, and the first preset value may be a protocol-specific or preset value used for uplink transmissions. Optionally, the first DCI format is used for scheduling downlink data transmissions, and the first preset value may be a protocol-specific or preset value used for downlink transmissions.

[0256] In this way, no higher layer configuration is required, the implementation is simple, and specific check functions can be implemented. For example, if a terminal receives one DCI but the BWP ID corresponding to the first cell in the DCI is not the first preset value, the terminal may consider the DCI to be a false alarm DCI and may discard the DCI.

[0257] Method 2: This scheme may be performed regardless of whether the first cell is in an inactive mode or a dormant mode. S603: The network device determines that the bit width of the BWP indicator field of the first cell in the first DCI is M bits, and determines that the first BWP ID is the maximum value corresponding to M bits. S604: The terminal determines that the bit width of the BWP indicator field of the first cell in the first DCI is M bits, and determines that the first BWP ID is the maximum value corresponding to M bits. Specifically, the terminal may determine the bit width of the BWP indicator field of the first cell according to the above-described method. For example, the terminal may determine that the bit width of the BWP indicator field of the first cell is 2 bits, and further determine that the two bits corresponding to the first BWP ID are 11 (maximum value). In another example, the terminal may determine that the bit width of the BWP indicator field of the first cell is 1 bit, and further determine that the two bits corresponding to the first BWP ID are 1 (maximum value).

[0258] When the bit width of the BWP indicator field of the first cell is determined, the bit width is determined only based on a BWP other than the first BWP or the first BWP ID, and not based on the first BWP or the first BWP ID. Optionally, the first DCI format is used to schedule uplink data transmission, and the terminal determines the bit width of the BWP indicator field of the first cell in the first DCI based on an uplink BWP other than the first BWP or the first BWP ID. Optionally, the first DCI format is used to schedule downlink data transmission, and the terminal determines the bit width of the BWP indicator field of the first cell in the first DCI based on a downlink BWP other than the first BWP or the first BWP ID.

[0259] In this way, no higher layer configuration is required, the implementation is simple, and the bit width of the existing BWP indicator field is not increased. Additionally, compared to the first scheme, in this scheme, the BWP ID used does not need to be an actual BWP, but is equivalent to a dedicated virtual BWP to indicate a BWP in inactive mode without causing confusion. In this solution, a specific check function can be implemented. For example, if a terminal receives one DCI but the BWP ID corresponding to the first cell in the DCI is not the maximum value corresponding to M bits, the terminal may consider the DCI to be a false alarm DCI and discard the DCI.

[0260] Method 3: This scheme may be performed regardless of whether the first cell is in an inactive mode or a dormant mode. S605: The network device determines that the first BWP ID of the first cell is a dormant BWP ID. S606: The terminal determines that the first BWP ID of the first cell is a dormant BWP ID. Specifically, when a dormant BWP ID (dormancy BWP ID) is preconfigured for the first cell, i.e., when a dormantBWP-Id is configured, the terminal determines that the first BWP ID is a dormant BWP ID. Optionally, when the first DCI format is used to schedule downlink data transmission, the first BWP is a downlink BWP, and when a dormant BWP ID is preconfigured for the first cell, the terminal determines that the first BWP ID is a dormant BWP ID.

[0261] In this way, no data is scheduled for the dormant BWP ID, whether in dormant mode or inactive mode, so that no confusion is caused. In this solution, a specific check function can be implemented. For example, if the terminal receives one DCI but the BWP ID corresponding to the first cell in the DCI is not a dormant BWP ID, the terminal may consider the DCI to be a false alarm DCI and may discard the DCI.

[0262] Method 4: This scheme may be performed when the first cell is in an inactive mode. S607: The network device determines that the first BWP ID is the first BWP ID used when the first cell is switched from the inactive mode to the active mode. S608: The terminal determines that the first BWP ID is the first BWP ID used when the first cell is switched from the inactive mode to the active mode. Specifically, the English name of the first BWP ID used when the first cell is switched from an inactive mode to an active mode may be firstActiveDownlinkBWP ID (applicable to downlink data transmission) or firstActiveUplinkBWP ID (applicable to uplink data transmission).

[0263] Optionally, the first DCI format is used to schedule uplink data transmission, and the terminal may determine that the first BWP ID is a first active uplink BWP ID (firstActiveUplinkBWP ID) to be used when the first cell is switched from an inactive mode to an active mode. Optionally, the first DCI format is used to schedule downlink data transmission, and the terminal may determine that the first BWP ID is a first active downlink BWP ID (firstActiveDownlinkBWP ID) to be used when the first cell is switched from an inactive mode to an active mode. The firstActiveDownlinkBWP ID and firstActiveUplinkBWP ID are configured for the terminal by the network device and correspond to higher layer parameters firstActiveDownlinkBWP-Id and firstActiveUplinkBWP-Id, respectively.

[0264] In this way, when the first cell enters active mode from inactive mode, the two BWP IDs can be directly used. Therefore, the two BWP IDs can be used to determine the size of another field in the DCI corresponding to the first cell. In this way, when the first cell enters active mode, the format of the DCI does not change, and the computational power consumption of the device can be reduced. In this solution, a specific check function can be implemented. For example, if a terminal receives one DCI but the BWP ID corresponding to the first cell in the DCI is not a dormant BWP ID, the terminal may consider the DCI to be a false alarm DCI and may discard the DCI.

[0265] Method 5: This scheme may be performed when the first cell is in an inactive mode. S609: The network device determines that the first BWP ID is the first active BWP ID used when the first cell is switched from the active mode to the current inactive mode. S610: The terminal determines that the first BWP ID is the first active BWP ID used when the first cell is switched from the active mode to the current inactive mode.

[0266] Specifically, the first active BWP ID used when the first cell is switched from the active mode to the current inactive mode is the last active BWP used when the first cell was in the active mode before the first cell was deactivated. Optionally, when the first DCI format is used to schedule uplink data transmission and the first cell is in the inactive mode, the terminal can determine that the first BWP is the active uplink BWP ID used before the first cell was switched from the active mode to the current inactive mode. Optionally, when the first DCI format is used to schedule downlink data transmission and the first cell is in the inactive mode, the terminal can determine that the first BWP is the active downlink BWP ID used before the first cell was switched from the active mode to the current inactive mode.

[0267] In this way, when the first cell enters the inactive mode from the active mode, the two BWP IDs can be directly used. Therefore, the two BWP IDs can be used to determine the size of another field in the DCI corresponding to the first cell. In this way, when the first cell enters the active mode, the format of the DCI does not change, and the computing power consumption of the device can be reduced.

[0268] Method 6: This scheme may be performed when the first cell is in an inactive mode. S611: The network device determines that the first BWP ID is a dedicated inactive BWP ID. S612: The terminal determines that the first BWP ID is a dedicated inactive BWP ID. Specifically, the terminal must first determine that a dedicated inactive BWP ID is preconfigured for the first cell, and after the dedicated inactive BWP ID is preconfigured for the first cell, further determine that the first BWP ID is a dedicated inactive BWP ID. Optionally, when the first DCI format is used to schedule uplink data transmission, the first cell is in the inactive mode, and a dedicated inactive uplink BWP ID is preconfigured for the first cell, the terminal can determine that the first BWP ID is a dedicated inactive uplink BWP ID. Optionally, when the first DCI format is used to schedule downlink data transmission, the first cell is in the inactive mode, and a dedicated inactive uplink BWP ID is preconfigured for the first cell, the terminal can determine that the first BWP ID is a dedicated inactive downlink BWP ID.

[0269] Method 7: This scheme may be implemented when the first cell is in a dormant mode. S613: The network device determines that a dormant BWP ID is pre-configured for the first cell and that a dedicated inactive BWP ID is not configured for the first cell, and determines that the first BWP ID is a dormant BWP ID. S614: The terminal determines that a dormant BWP ID is pre-configured for the first cell, that a dedicated inactive BWP ID is not configured for the first cell, and that the first BWP ID is a dormant BWP ID. Specifically, the terminal needs to first determine that a dormant BWP ID is pre-configured for the first cell and that a dedicated inactive BWP ID is not configured for the first cell, so that the terminal can determine that the first BWP ID is a dormant BWP ID.

[0270] Method 8: This scheme may be performed when the first cell is in a dormant mode (or the active BWP of the first cell is a dormant BWP). S615: The network device determines that the first BWP ID is the first corresponding non-dormant BWP ID within the active time. S616: The terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID within the active time. Specifically, the first corresponding non-dormant BWP ID within the active time may be firstWithinActiveTimeBWP-Id. The terminal needs to first determine that the first corresponding non-dormant BWP ID within the active time is configured for the first cell, so that the terminal can further determine that the first BWP ID is the first corresponding non-dormant BWP ID within the active time.

[0271] In the present application, the first corresponding non-dormant BWP within the active time of the first cell is the first non-dormant BWP used when the active downlink BWP of the first cell is switched from a dormant BWP to a non-dormant BWP, the DCI indicating that the active downlink BWP of the first cell is switched to a dormant BWP is received within the active time or is the first non-dormant BWP used when the active downlink BWP of the first cell is switched from a dormant BWP to a non-dormant BWP, and the format of the DCI indicating that the active downlink BWP of the first cell is switched to a dormant BWP is DCI format 0_1 ​​or DCI format 1_1.

[0272] In this way, when the first cell enters non-dormant mode from dormant mode, the first BWP ID can be directly used. Therefore, the BWP ID can be used to determine the size of another field corresponding to the first cell in the DCI. In this way, when the first cell exits dormant mode, the format of the DCI does not change, and the computational power consumption of the device can be reduced. In this solution, a specific check function can be implemented. For example, in dormant mode, if the terminal receives one DCI but the BWP ID corresponding to the first cell in the DCI is not the first corresponding non-dormant BWP ID within the active time, the terminal may consider the DCI to be a false alarm DCI and discard the DCI.

[0273] Method 9: This scheme may be performed when the first cell is in a dormant mode (or the active BWP of the first cell is a dormant BWP). S617: The network device determines that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time. S618: The terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time. Specifically, the English name corresponding to the first corresponding non-dormant BWP ID outside the active time may be firstOutsideActiveTimeBWP-Id. In this manner, the terminal needs to determine that the first corresponding non-dormant BWP ID outside the active time is configured for the first cell and the first corresponding non-dormant BWP ID within the active time is not configured for the first cell, so that the terminal can determine that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time.

[0274] In the present application, the first corresponding non-dormant BWP outside the active time of the first cell is the first non-dormant BWP used when the active downlink BWP of the first cell is switched from a dormant BWP to a non-dormant BWP, and the DCI indicating that the active downlink BWP of the first cell is switched to a dormant BWP is received outside the active time, or the first non-dormant BWP used when the active downlink BWP of the first cell is switched from a dormant BWP to a non-dormant BWP, and the format of the DCI indicating that the active downlink BWP of the first cell is switched to a dormant BWP is DCI format 2_6. In this solution, a specific check function can be implemented. For example, in dormant mode, if the terminal receives one DCI but the BWP ID corresponding to the first cell in the DCI is not the first corresponding non-dormant BWP ID outside the active time, the terminal may consider the DCI to be a false alarm DCI and may discard the DCI.

[0275] Method 10: This scheme may be performed when the first cell is in a dormant mode (or the active BWP of the first cell is a dormant BWP). S619: Before the first cell enters a dormant mode, the terminal receives a second DCI, where the second DCI instructs the terminal to switch the active downlink BWP of the first cell to a dormant BWP. Correspondingly, before the first cell enters the dormant mode, the network device sends a second DCI to the terminal.

[0276] Before the first cell enters the dormant mode, the terminal may further receive a second DCI from the network device and switch the active downlink BWP of the first cell to a dormant BWP based on the second DCI. In other words, the terminal switches the first cell from the non-dormant mode to the dormant mode based on the second DCI.

[0277] S620: The network device determines that the first BWP ID is the first corresponding non-dormant BWP ID within the active time.

[0278] S621: The terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID within the active time.

[0279] If the second DCI is received within the active time, the terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID within the active time.

[0280] Method 11: This scheme may be performed when the first cell is in a dormant mode (or the active BWP of the first cell is a dormant BWP). S619: Before the first cell enters a dormant mode, the terminal receives a second DCI, where the second DCI instructs the terminal to switch the active downlink BWP of the first cell to a dormant BWP. Correspondingly, before the first cell enters the dormant mode, the network device sends a second DCI to the terminal.

[0281] S622: The network device determines that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time.

[0282] S623: The terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time.

[0283] If the second DCI is received outside the active time, the terminal determines that the first BWP ID is the first corresponding non-dormant BWP ID outside the active time.

[0284] After the first BWP ID is determined by any one of the above-mentioned methods 1 to 11, the network device and the terminal may further determine the amount of information bits of the first DCI format and the specific indicator field of the first cell in the first DCI format.

[0285] S503: The network device determines the amount of information bits of the first DCI format based on the first BWP ID.

[0286] S504: The terminal determines the amount of information bits of the first DCI format based on the first BWP ID.

[0287] The manner in which the network device determines the number of information bits of the first DCI format based on the first BWP ID is the same as the manner in which the terminal determines the number of information bits of the first DCI format based on the first BWP ID. For the specific manner and content of the first DCI format, please refer to the prior art. The details will not be described again in this specification.

[0288] S505: The network device determines, based on the first BWP ID, a specific indicator field of the first cell in the first DCI format.

[0289] S506: The terminal determines, based on the first BWP ID, a specific indicator field of the first cell in the first DCI format.

[0290] In this way, according to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when a first cell is in active mode or idle mode, the specific indicator field corresponding to the first cell is determined based on the BWP ID of the first cell, which improves information transmission performance.

[0291] Method B: This scheme may be performed regardless of whether the first cell is in an inactive mode or a dormant mode. S507: The network device determines that the first BWP ID of the first cell is a virtual BWP ID. S508: The terminal determines that the first BWP ID of the first cell is a virtual BWP ID.

[0292] Specifically, the terminal may further determine that the first BWP ID is a virtual BWP ID, and that the bandwidth or subcarrier spacing SCS of the BWP is not configured for the BWP corresponding to the virtual BWP ID. Optionally, when the first DCI format is used to schedule uplink data transmission and the first cell is in an inactive mode, the terminal may determine that the first BWP ID is a virtual uplink BWP ID. Optionally, when the first DCI format is used to schedule downlink data transmission and the first cell is in an inactive mode, the terminal may determine that the first BWP ID is a virtual downlink BWP ID. The virtual uplink BWP ID and the virtual downlink BWP ID configured by the network device and received by the terminal may be the same or different.

[0293] In this way, the implementation is simple and confusion is not easily caused. Furthermore, a specific check function can be implemented. For example, if a terminal receives one DCI but the BWP ID corresponding to the first cell in the DCI is not a virtual BWP ID, the terminal may consider the DCI to be a false alarm DCI and may discard the DCI.

[0294] S509: The network device determines the number of information bits of the first DCI format based on the second preset BWP ID.

[0295] S510: The terminal determines the amount of information bits of the first DCI format based on the second preset BWP ID.

[0296] Specifically, the network device and the terminal may acquire a second preset BWP ID and determine the number of information bits of the first DCI format based on the second preset BWP ID. The second preset BWP ID may be specified by a protocol or indicated by a higher layer. This is not limited in the present application. Optionally, the network device and the terminal may acquire the second preset BWP ID, set the BWP ID in the first DCI format based on the second preset BWP ID, and determine the number of information bits of the BWP indicator field in the first DCI format. Optionally, the manner in which the network device determines the number of information bits of the first DCI format based on the first BWP ID is the same as the manner in which the terminal determines the number of information bits of the first DCI format based on the first BWP ID. For the specific manner and content of the first DCI format, please refer to the prior art. The details will not be described again in this specification.

[0297] S511: The network device determines a specific indicator field of the first cell in the first DCI format based on a second preset BWP ID.

[0298] S512: The terminal determines a specific indicator field of the first cell in the first DCI format based on the second preset BWP ID.

[0299] In this way, according to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when the first cell is in active mode or idle mode, the specific indicator field corresponding to the first cell is determined based on the preset BWP ID, which improves information transmission performance.

[0300] Method C: This scheme may be performed regardless of whether the first cell is in an inactive mode or a dormant mode. S513: The network device does not set a specific indicator field of the first cell in the first DCI format. S514: The terminal does not set a specific indicator field of the first cell in the first DCI format. Specifically, the network device and the terminal may determine the first BWP ID by referring to any one of the above-mentioned methods. However, regardless of whether the first BWP ID is a real BWP ID or a virtual BWP ID, both the network device and the terminal may not set a specific indicator field of the first cell in the first DCI format.

[0301] According to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when a first cell is in active mode or idle mode, the format of the DCI is determined based on the BWP ID of the first cell. The DCI format includes, but is not limited to, the amount of information bits of the DCI and a specific indicator field corresponding to each cell. This helps to accurately determine the DCI format and improve information transmission performance.

[0302] 7 is a schematic flowchart of another example of a downlink control information transmission method according to the present application. This embodiment focuses on how a terminal device performs subsequent processing after receiving a first DCI format to determine whether the first DCI format is a false alarm DCI format and whether there is no scheduling in the first cell based on the first BWP ID of the first cell.

[0303] S710: A terminal device receives first cross-carrier scheduling configuration information, where the first cross-carrier scheduling configuration information instructs the terminal device to monitor a first downlink control information DCI format.

[0304] S710 is the same as S410, and the details will not be described again here.

[0305] S720: The terminal device receives second cross-carrier scheduling configuration information, where the second cross-carrier scheduling configuration information includes a first pre-configured BWP ID.

[0306] Specifically, the terminal device may receive the first preset BWP ID from the network device, or may obtain the first preset BWP ID from another device (e.g., a cloud device or a cloud memory), etc. This is not limited in the present application.

[0307] Optionally, the terminal device may further determine a first preset BWP ID according to the method in the above-described embodiment. For example, the terminal device may determine that the first preset BWP ID is a first preset value. The first preset value may be a protocol-specified or preset value, for example, 0 or 1.

[0308] S730: The terminal device monitors and receives a first DCI format based on an amount of information bits of the first DCI format, where the first DCI format includes a first BWP ID of the first cell.

[0309] The first BWP ID is the first BWP ID determined by the network device. After receiving the first BWP ID determined by the network device, the terminal device may have the following two processing methods:

[0310] Method a: S740: The terminal device determines that the first cell is in an inactive mode or a dormant mode. S750: If the first BWP ID is not the first preset BWP ID, determine that the first DCI format is a false alarm DCI. Specifically, if the received first BWP ID determined by the network device is not the first pre-configured BWP ID obtained by the terminal device, the terminal device may determine that the first DCI format is a false alarm DCI format and may discard the first DCI format.

[0311] In this way, if a terminal device receives one DCI format but the BWP ID corresponding to the first cell in the DCI format is not a preset BWP ID, the terminal device may consider the DCI format to be a false alarm DCI format and may discard the DCI format to reduce the false alarm probability and improve information transmission performance.

[0312] Method b: S760: The terminal device determines that the first cell is in an active mode and a non-dormant mode. S770: If the first BWP ID is a virtual BWP ID, determine that there is no scheduling in the first cell. Specifically, if the first BWP ID determined by the network device is a virtual BWP ID, the terminal device can determine that scheduling does not exist in the first cell, i.e., the first DCI format is not used to schedule data transmission of the first cell.

[0313] Optionally, when the received first BWP ID determined by the network device is a dormant BWP ID, the terminal device may also determine that there is no scheduling in the first cell, i.e., the first DCI format is not used to schedule data transmission of the first cell.

[0314] Optionally, if the received first BWP ID determined by the network device is a virtual BWP ID or a dormant BWP ID, the terminal device may further consider the DCI format to be a false alarm DCI format, and may discard the DCI format to reduce the false alarm probability and improve information transmission performance.

[0315] In this scheme, the BWP ID indicates that no scheduling exists, thereby extending the indication range of the CIF field. The example in which two bits indicate the four carrier combinations shown in Table 5 is still used. If the CIF field indicates 3 and the BWP ID of CC2 indicates that the BWP ID does not correspond to an actual BWP (i.e., it is a virtual BWP ID) or is a dormant BWP-Id in TDD, the terminal device considers that no scheduling exists on CC2. In this way, the combination of the CIF field and the BWP indicator field indicates the scheduling of three cells, namely, CC0, CC1, and CC3. When the bit width of the CIF field is not extended, the indication range of the CIF field is extended, and the bit overhead of the DCI format is reduced.

[0316] 8 is a schematic flowchart of yet another example of a downlink control information transmission method according to the present application. In this embodiment, regardless of what changes occur in the status of the scheduled cell (e.g., the first cell), the amount of information bits in the DCI format for scheduling the cell remains unchanged.

[0317] S810: A terminal receives first cross-carrier scheduling configuration information, where the first cross-carrier scheduling configuration information instructs the terminal device to monitor a first downlink control information DCI format.

[0318] In response, the network device transmits first cross-carrier scheduling configuration information.

[0319] The first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the first DCI format can be used to schedule the first cell. Using the first DCI format to simultaneously schedule data transmissions of two or more cells can be understood as the first DCI format can be used to simultaneously schedule downlink data transmissions of two or more cells, the first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells, or the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, and the data transmissions are uplink data transmissions or downlink data transmissions.

[0320] S820: When the status of the first cell changes, the terminal keeps the amount of information bits of the first DCI format unchanged.

[0321] Correspondingly, when the status of the first cell changes, the network device also keeps the amount of information bits of the first DCI format unchanged.

[0322] Changing the status of the first cell includes, but is not limited to, switching the first cell from an active mode to an inactive mode, switching the first cell from a non-dormant mode to a dormant mode, switching the first cell from an inactive mode to an active mode, and switching the first cell from a dormant mode to a non-dormant mode.

[0323] S830: The terminal monitors the first DCI format based on the amount of information bits of the first DCI format.

[0324] Correspondingly, the network device transmits the first DCI format based on the amount of information bits of the first DCI format.

[0325] The terminal monitoring one DCI format means that the terminal attempts to perform blind detection on the control channel on the time-frequency resource corresponding to the control channel candidate, and performs decoding and CRC check based on the amount of information bits of the DCI format. If the check is successful, it is considered that one DCI format has been successfully received on the control channel candidate, or if the check is unsuccessful, it is considered that no control channel has been detected on the control channel candidate.

[0326] According to the technical solution of the present application, one DCI is used to schedule data transmissions of multiple cells, and when the status of the scheduled cells changes, the amount of information bits of the DCI remains unchanged, which helps to accurately determine the DCI format and reduces the implementation complexity of the terminal or network device.

[0327] It can be understood that to implement the functions in the above-described embodiments, the network device and the terminal include corresponding hardware structures and / or software modules for performing each function. Those skilled in the art should easily recognize that the present application can be implemented by using hardware or a combination of hardware and computer software, in combination with the units and method steps in the examples described in the embodiments disclosed in the present application. Whether the functions are performed by hardware or by hardware driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0328] 9 and 10 are diagrams of possible structures of communication devices according to embodiments of the present application. These communication devices may be configured to implement the functions of the terminal or network device in the above-mentioned method embodiments, and thus may also implement the beneficial effects of the above-mentioned method embodiments. In the embodiments of the present application, the communication device may be one of the terminal devices 102-104 shown in FIG. 1, or may be the network device 101 shown in FIG. 1, or may be a module (e.g., a chip) used in the terminal or network device.

[0329] 9, the communication apparatus 900 includes a processing unit 910 and a transceiver unit 920. The communication apparatus 900 is configured to implement the functions of a terminal or a network device in the method embodiments shown in FIGS.

[0330] When the communications apparatus 900 is configured to implement the functionality of the terminal in the embodiment of the method shown in FIG. 4, the transceiver unit 920 is configured to receive first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to the terminal device to monitor a first downlink control information (DCI) format, the first DCI format can be used to schedule data transmissions of two or more cells, the processing unit 910 is configured to determine, when the first cell is in an inactive mode or a dormant mode, a quantity of information bits of the first DCI format based on a first bandwidth portion (BWP) of the first cell, and the transceiver unit 920 is further configured to monitor the first DCI format based on the quantity of information bits of the first DCI format.

[0331] Optionally, the transceiver unit 920 is further configured to receive a second DCI format. The processing unit 910 is specifically configured to switch an active downlink BWP of the first cell to a dormant BWP based on the second DCI format.

[0332] Optionally, the transceiver unit 920 is further configured to receive second cross-carrier scheduling configuration information.

[0333] When the communications apparatus 900 is configured to implement the functions of the network device in the embodiment of the method shown in FIG. 4 , the transceiver unit 920 is configured to transmit first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating that the terminal device monitors a first downlink control information (DCI) format, the first DCI format can be used to schedule data transmissions of two or more cells, the processing unit 910 is configured to determine, when the first cell is in an inactive mode or a dormant mode, an amount of information bits of the first DCI format based on a first bandwidth portion (BWP) of the first cell, and the transceiver unit 920 is further configured to monitor the first DCI format based on the amount of information bits of the first DCI format.

[0334] Optionally, the transceiver unit 920 is further configured to transmit a second DCI format.

[0335] Optionally, the transceiver unit 920 is further configured to transmit second cross-carrier scheduling configuration information.

[0336] For a more detailed description of the processing unit 910 and the transceiver unit 920, please refer to the relevant description in the method embodiment shown in FIG.

[0337] 10 , the communication device 1000 includes a processor 1010 and an interface circuit 1020. The processor 1010 and the interface circuit 1020 are coupled to each other. It may be understood that the interface circuit 1020 may be a transceiver or an input / output interface. Optionally, the communication device 1000 may further include a memory 1030 configured to store instructions to be executed by the processor 1010, to store input data required for executing the instructions by the processor 1010, or to store data generated after the processor 1010 executes the instructions.

[0338] When the communication device 1000 is configured to implement the method shown in FIG. 4, the processor 1010 is configured to implement the functions of the processing unit 910, and the interface circuit 1020 is configured to implement the functions of the transceiver unit 920.

[0339] When the communication device is a chip used in a terminal, the chip in the terminal implements the functions of the terminal in the above-mentioned method embodiment. The chip in the terminal receives information from another module (e.g., a radio frequency module or an antenna) in the terminal, and the information is transmitted to the terminal by the network device. Alternatively, the chip in the terminal transmits information to another module (e.g., a radio frequency module or an antenna) in the terminal, and the information is transmitted to the network device by the terminal.

[0340] When the communication device is a module used in a network device, the module in the network device implements the functions of the network device in the above-described method embodiments. The module in the network device receives information from another module (e.g., a radio frequency module or an antenna) in the network device, and the information is transmitted to the network device by a terminal. Alternatively, the module in the network device transmits information to another module (e.g., a radio frequency module or an antenna) in the network device, and the information is transmitted to the terminal by the network device. The module in the network device in this specification may be a baseband chip of the network device, or may be a DU or another module. The DU in this specification may be a DU in an open radio access network (O-RAN) architecture.

[0341] It may be understood that the processor in the embodiments of the present application may be a Central Processing Unit (CPU), or may be another general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. A general-purpose processor may be a microprocessor, or any conventional processor, etc.

[0342] The method steps in the embodiments of the present application may be implemented in hardware or software instructions that can be executed by a processor. The software instructions may include corresponding software modules. The software modules may be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage medium well known in the art. For example, the storage medium is coupled to the processor such that the processor can read information from and write information to the storage medium. The storage medium may alternatively be components of the processor. The processor and the storage medium may be located in an ASIC. In addition, the ASIC may be located in a network device or a terminal. The processor and the storage medium may alternatively reside in the network device or terminal as discrete components.

[0343] All or part of the above-described embodiments may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded into a computer and executed, all or part of the procedures or functions of the embodiments of the present application are performed. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, user equipment, or another programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via a wired or wireless method. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device, such as a server or data center that integrates one or more available media. The available media may be magnetic media such as floppy disks, hard disks, or magnetic tapes, or optical media such as digital video disks, or semiconductor media such as solid-state drives. The computer-readable storage media may be volatile or nonvolatile storage media, or may include both volatile and nonvolatile storage media.

[0344] In various embodiments of the present application, unless otherwise specified or there is no logical contradiction, the terms and / or descriptions in different embodiments are consistent and can be cross-referenced, and the technical features in different embodiments can be combined based on their internal logical relationships to form new embodiments.

[0345] In this application, "at least one" means one or more, and "multiple" means two or more. The term "and / or" describes an associative relationship for describing related objects and indicates that three relationships may exist. For example, A and / or B can represent the case where only A is present, the case where both A and B are present, and the case where only B is present, and A and B may be singular or plural. In the text description of this application, the character " / " represents an "or" relationship between related objects. In the formulas of this application, the character " / " represents a "divide" relationship between related objects. "Comprising at least one of A, B, and C" can represent including A, including B, including C, including A and B, including A and C, including B and C, and including A, B, and C.

[0346] It can be understood that various numbers in the embodiments of the present application are only used for distinction to facilitate description, and are not used to limit the scope of the embodiments of the present application. The sequence numbers of the above processes do not imply the execution order, and the execution order of the processes should be determined based on the functions and internal logic of the processes. [Explanation of symbols]

[0347] 3. Career 16 3GPP release 100 Communication Systems 101 Network Devices 102 Terminal Devices 103 Terminal Devices 104 Terminal Devices 105 Core Network Devices 900 Communication Equipment 910 Processing Unit 920 Transceiver Unit 1000 Communication Equipment 1010 processor 1020 Interface circuit 1030 memory

Claims

1. A downlink control information transmission method, comprising: receiving first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information indicating to a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being usable for scheduling data transmissions of two or more cells; determining an amount of information bits of the first DCI format based on a first bandwidth portion BWP of the first cell when the first cell is in an inactive mode or a dormant mode; monitoring the first DCI format based on the amount of information bits of the first DCI format.

2. the first DCI format may be used to simultaneously schedule downlink data transmissions of two or more cells; The first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells; or 2. The method of claim 1, wherein the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, the data transmissions being uplink data transmissions or downlink data transmissions.

3. The first BWP comprises: the last non-dormant active uplink BWP used before the first cell is currently in the inactive mode or dormant mode; the last non-dormant active downlink BWP used before the first cell was in the current inactive or dormant mode; a first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; a first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; a first corresponding non-dormant BWP of the first cell during the active time; a first corresponding non-dormant BWP of the first cell outside of an active time; an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside of an active time; or Current active uplink BWP 3. The method according to claim 1 or 2, wherein the method is one of:

4. determining an amount of information bits of the first DCI format based on a first BWP of the first cell, determining the amount of information bits of the first DCI format based on the first BWP and a third BWP of the first cell; The first BWP comprises: the last non-dormant active downlink BWP used before the first cell is currently in the inactive or dormant mode; a first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; the first corresponding non-dormant BWP of said first cell during the active time; or one of the first corresponding non-dormant BWPs of the first cell outside of an active time; The third BWP is: the last non-dormant active uplink BWP used before the first cell was in the current inactive or dormant mode; a first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside of an active time; or One of the current active uplink BWPs, 3. The method according to claim 1 or 2.

5. the first cell is in the inactive mode; the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode; If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a non-dormant BWP, the first BWP is the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within an active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of an active time, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; If the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell within an active time; or 5. The method of claim 4, wherein if the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside active time.

6. When the first cell is in the sleep mode, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current dormant mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current dormant mode; When the first corresponding non-dormant BWP in an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in an active time, and the third BWP is the currently active uplink BWP; When the first corresponding non-dormant BWP in an active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of an active time, and the third BWP is the currently active uplink BWP; When the first corresponding non-dormant BWP in an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in an active time; When the first corresponding non-dormant BWP in an active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside of an active time; When a dormancy indication indicating that the first cell enters the current dormant mode is received within an active time, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the currently active uplink BWP; When a dormancy indication indicating that the first cell enters the current dormant mode is received outside an active time, the first BWP is the first corresponding non-dormant BWP outside an active time, and the third BWP is the currently active uplink BWP; When a dormancy indication indicating that the first cell enters the current dormant mode is received within an active time, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell within an active time; or 5. The method of claim 4, wherein, when a dormancy indication indicating that the first cell is to enter the current dormant mode is received outside an active time, the first BWP is the first corresponding non-dormant BWP outside an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside an active time.

7. Before the step of determining the number of information bits of the first DCI format, the method further comprises: The method of any one of claims 1 to 6, further comprising the step of determining a first BWP ID, wherein said first BWP ID is an ID of said first BWP.

8. The step of determining the first BWP ID comprises: The method of claim 7, comprising determining that the first BWP ID is a first preset value.

9. The step of determining the first BWP ID comprises:

8. The method of claim 7, comprising: determining that a bit width of a BWP indicator field of the first cell in the first DCI format is M bits; and determining that the first BWP ID is a maximum value corresponding to the M bits, where M is a positive integer.

10. When the first cell is in the inactive mode, the step of determining the first BWP ID includes: determining that the first BWP ID is an ID of a first active BWP to be used when the first cell is switched from the inactive mode to the active mode; or 8. The method of claim 7, comprising determining that the first BWP ID is an ID of an active BWP that was used before the first cell was switched from the active mode to the current inactive mode.

11. When the first cell is in the inactive mode, the step of determining the first BWP ID includes: determining that the first BWP ID is the dedicated inactive BWP ID when a dedicated inactive BWP ID is pre-configured for the first cell; or 8. The method of claim 7, comprising determining that the first BWP ID is the dormant BWP ID when a dormant BWP ID is preconfigured for the first cell and a dedicated inactive BWP ID is not preconfigured for the first cell.

12. When the first cell is in the dormant mode, the step of determining the first BWP ID includes: determining that the first BWP ID is the first corresponding non-dormant BWP ID within an active time when the first corresponding non-dormant BWP ID within an active time is pre-configured for the first cell; or 8. The method of claim 7, comprising: determining that a first BWP ID is the first corresponding non-dormant BWP ID outside of an active time when a first corresponding non-dormant BWP ID outside of an active time is preconfigured for the first cell and a first corresponding non-dormant BWP ID within an active time is not preconfigured for the first cell.

13. When the first cell is in the dormant mode, the step of determining the first BWP ID includes: receiving a second DCI format; switching an active downlink BWP of the first cell to a dormant BWP based on the second DCI format; determining, when the second DCI format is received within an active time, that the first BWP ID is the first corresponding non-dormant BWP ID within the active time; or 8. The method of claim 7, further comprising: when the second DCI format is received outside an active time, determining that the first BWP ID is a first corresponding non-dormant BWP ID outside an active time.

14. The step of determining the first BWP ID comprises: The method of claim 7 , comprising determining that the first BWP ID is the dormant BWP ID when a dormant BWP ID is preconfigured for the first cell.

15. A downlink control information transmission method, comprising: transmitting first cross-carrier scheduling configuration information, the first cross-carrier scheduling configuration information instructing a terminal device to monitor a first downlink control information (DCI) format, the first DCI format being usable for scheduling data transmissions of two or more cells; determining an amount of information bits of the first DCI format based on a first bandwidth portion BWP of the first cell when the first cell is in an inactive mode or a dormant mode; transmitting the first DCI format based on the amount of information bits of the first DCI format.

16. the first DCI format may be used to simultaneously schedule downlink data transmissions of two or more cells; The first DCI format can be used to simultaneously schedule uplink data transmissions of two or more cells; or 16. The method of claim 15, wherein the first DCI format can be used to simultaneously schedule data transmissions of two or more cells, the data transmissions being uplink data transmissions or downlink data transmissions.

17. The first BWP comprises: the last non-dormant active uplink BWP used before the first cell is currently in the inactive mode or dormant mode; the last non-dormant active downlink BWP used before the first cell was in the current inactive or dormant mode; a first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; a first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; the first corresponding non-dormant BWP of said first cell during the active time; or a first corresponding non-dormant BWP of the first cell outside of an active time; and an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside of an active time; or Current active uplink BWP 17. The method according to claim 15 or 16, wherein the method is one of

18. determining an amount of information bits of the first DCI format based on a first BWP of the first cell, determining the amount of information bits of the first DCI format based on the first BWP and a third BWP of the first cell; The first BWP comprises: the last non-dormant active downlink BWP used before the first cell is currently in the inactive or dormant mode; a first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; the first corresponding non-dormant BWP of said first cell during the active time; or one of the first corresponding non-dormant BWPs of the first cell outside of an active time; The third BWP is: the last non-dormant active uplink BWP used before the first cell was in the inactive mode or the dormant mode; a first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; an uplink BWP whose identifier ID is the same as the identifier of the first corresponding non-dormant BWP of the first cell in the active time; an uplink BWP having the same ID as the ID of the first corresponding non-dormant BWP of the first cell outside of an active time; or One of the current active uplink BWPs, 17. The method of claim 15 or 16.

19. the first cell is in the inactive mode; the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current inactive mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current inactive mode; If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a non-dormant BWP, the first BWP is the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; If the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within an active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of an active time, and the third BWP is the first active uplink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode; If the first active downlink BWP configured for the first cell and used when the first cell switches from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell within an active time; or 19. The method of claim 18, wherein if the first active downlink BWP configured for the first cell and used when the first cell is switched from the inactive mode to the active mode is a dormant BWP, and the first corresponding non-dormant BWP within active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside active time.

20. When the first cell is in the sleep mode, the first BWP is the last non-dormant active downlink BWP used before the first cell entered the current dormant mode, and the third BWP is the last non-dormant active uplink BWP used before the first cell entered the current dormant mode; When the first corresponding non-dormant BWP in an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in an active time, and the third BWP is the currently active uplink BWP; When the first corresponding non-dormant BWP in an active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of an active time, and the third BWP is the currently active uplink BWP; When the first corresponding non-dormant BWP in an active time is pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP in an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell in an active time; When the first corresponding non-dormant BWP in an active time is not pre-configured for the first cell, the first BWP is the first corresponding non-dormant BWP outside of an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside of an active time; When a dormancy indication indicating that the first cell enters the current dormant mode is received within an active time, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the currently active uplink BWP; When a dormancy indication indicating that the first cell enters the current dormant mode is received outside an active time, the first BWP is the first corresponding non-dormant BWP outside an active time, and the third BWP is the currently active uplink BWP; When a dormancy indication indicating that the first cell enters the current dormant mode is received within an active time, the first BWP is the first corresponding non-dormant BWP within an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell within an active time; or 19. The method of claim 18, wherein, when a dormancy indication indicating that the first cell is to enter the current dormant mode is received outside an active time, the first BWP is the first corresponding non-dormant BWP outside an active time, and the third BWP is the uplink BWP whose ID is the same as the ID of the first corresponding non-dormant BWP of the first cell outside an active time.

21. Before the step of determining the amount of information bits of the first DCI format, the method further comprises: The method of any one of claims 15 to 20, further comprising a step of determining the first BWP ID, wherein the first BWP ID is an ID of the first BWP.

22. The step of determining the first BWP ID comprises:

22. The method of claim 21, comprising determining that the first BWP ID is a first preset value.

23. The step of determining the first BWP ID comprises:

22. The method of claim 21, comprising: determining that a bit width of a BWP indicator field of the first cell in the first DCI format is M bits; and determining that the first BWP ID is a maximum value corresponding to the M bits, where M is a positive integer.

24. When the first cell is in the inactive mode, the step of determining the first BWP ID includes: determining that the first BWP ID is an ID of a first active BWP to be used when the first cell is switched from the inactive mode to the active mode; or 22. The method of claim 21, comprising determining that the first BWP ID is an ID of an active BWP that was used before the first cell was switched from the active mode to the currently inactive mode.

25. When the first cell is in the inactive mode, the step of determining the first BWP ID includes: determining that the first BWP ID is the dedicated inactive BWP ID when a dedicated inactive BWP ID is pre-configured for the first cell; or 22. The method of claim 21, comprising determining that the first BWP ID is the dormant BWP ID when a dormant BWP ID is preconfigured for the first cell and a dedicated inactive BWP ID is not preconfigured for the first cell.

26. When the first cell is in the dormant mode, the step of determining the first BWP ID includes: determining that the first BWP is the first corresponding non-dormant BWP in an active time when the first corresponding non-dormant BWP in an active time is pre-configured for the first cell; or 22. The method of claim 21, comprising: determining that the first BWP is the first corresponding non-dormant BWP outside of active time when the first corresponding non-dormant BWP outside of active time is preconfigured for the first cell and the first corresponding non-dormant BWP within active time is not preconfigured for the first cell.

27. When the first cell is in the dormant mode, the step of determining the first BWP ID includes: transmitting a second DCI format, the second DCI format instructing the terminal device to switch an active downlink BWP of the first cell to a dormant BWP; determining that the first BWP ID is the first corresponding non-dormant BWP ID within an active time when the second DCI format is transmitted within an active time; or 22. The method of claim 21, comprising determining, when the second DCI format is transmitted outside an active time, that the first BWP ID is a first corresponding non-dormant BWP ID outside an active time.

28. The step of determining the first BWP ID comprises:

22. The method of claim 21, comprising determining that the first BWP ID is the dormant BWP ID when a dormant BWP ID is preconfigured for the first cell.

29. A communication device, a memory configured to store computer instructions; Executing the computer instructions stored in the memory to enable the communication device to perform the method of any one of claims 1 to 14; or A processor configured to enable said communication device to perform the method of any one of claims 15 to 28.

30. A computer readable storage medium storing a computer program, the computer program being adapted to perform the method of any one of claims 1 to 28 when executed by a communications device.

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