Communication method, user equipment and base station

Abstract

The embodiment of the invention provides a communication method, user equipment and a base station. The method executed by the user equipment comprises the following steps: a first signaling comprises information related to at least two activated BWPs, the at least two activated BWPs are respectively on different carriers, and the carriers where the at least two activated BWPs are respectively located are configured in the same service cell; according to the embodiment of the invention, the UE can activate the at least two BWPs in one serving cell for transmission at the same time, and compared with the mode of aggregating the activated BWPs of a plurality of serving cells for transmission, the UE can activate the at least two BWPs in the serving cell for transmission more flexibly, the system can be simplified, and the signaling overhead can be saved.

Description

Technical Field

[0001] This application relates to the field of wireless communication technologies. Specifically, this application relates to a communication method, a User Equipment (UE), and a base station. Background Art

[0002] In order to meet the increasing demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "ultra 4G networks" or "post-LTE systems".

[0003] 5G communication systems are implemented in higher frequency (millimeter wave, mmWave) bands, such as the 60 GHz band, to achieve higher data rates. To reduce the propagation loss of radio waves and increase the transmission distance, techniques such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas have been discussed in 5G communication systems.

[0004] In addition, in 5G communication systems, developments for improving system networks are ongoing based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), receiver interference cancellation, etc.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superimposed coding (SWSC) as advanced coding modulation (ACM), as well as filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies, have been developed.

[0006] In existing communication systems, multiple carriers can be deployed through Carrier Aggregation (CA) or Dual-Connectivity (DC). In CA / DC, only one Bandwidth Part (BWP) of each serving cell can be activated, and the UE achieves simultaneous transmission by aggregating the activated BWPs of multiple serving cells. However, in this aggregation transmission mode, each cell requires its own signaling overhead, resulting in a complex system. Summary of the Invention

[0007] Embodiments of this application aim to improve the flexibility of aggregation transmission to achieve purposes such as simplifying the system and saving signaling overhead.

[0008] According to one aspect of the embodiments of this application, there is provided a method performed by a UE in a communication system, the method including:

[0009] Receive a first signaling, where the first signaling includes information related to at least two activated BWPs, and at least two activated BWPs are respectively on different carriers, and the carriers where the at least two activated BWPs are located are configured in the same serving cell;

[0010] Perform uplink transmission or downlink transmission on at least two activated BWPs.

[0011] Optionally, the first signaling is indicated by at least one of UE-specific radio resource control (RRC) signaling, a control element (MAC CE) of the media access control layer, and downlink control information (DCI).

[0012] Optionally, performing uplink transmission or downlink transmission on at least two activated BWPs includes: if at least one of the at least two activated BWPs indicated by the first signaling is different from the previously activated BWP and not on the same carrier, perform cross-carrier BWP switching, and perform uplink transmission or downlink transmission on the at least two activated BWPs obtained after performing BWP switching.

[0013] Optionally, performing cross-carrier BWP switching includes at least one of the following conditions:

[0014] The frequency domain interval between the carrier before switching and the carrier after switching does not exceed a first preset bandwidth;

[0015] Both the carrier before switching and the carrier after switching are included within a second preset bandwidth;

[0016] The frequency domain interval between the BWP before switching and the BWP after switching does not exceed a third preset bandwidth;

[0017] Both the BWP before switching and the BWP after switching are included within a fourth preset bandwidth.

[0018] Optionally, for each of the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth, the size of each preset bandwidth is different in FR1 and FR2 scenarios, and / or, the size of each preset bandwidth is different for UEs with different capabilities.

[0019] Optionally, performing cross-carrier BWP switching includes:

[0020] Perform BWP switching within a first preset duration, where the first preset duration corresponds to the switching delay of switching the activated BWP from a BWP on one carrier to another BWP on another carrier;

[0021] Among them, the length of the first preset duration is different from the length of the second preset duration, and the second preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier to another BWP on the same carrier.

[0022] Optionally, performing cross-carrier BWP switching includes at least one of the following:

[0023] If the BWP before handover and the BWP after handover are respectively in different frequency bands, perform cross-carrier BWP switching within a third preset duration, and the third preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within another frequency band;

[0024] If the BWP before handover and the BWP after handover are in the same frequency band, perform cross-carrier BWP switching within a fourth preset duration, and the fourth preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within the same frequency band;

[0025] Among them, the length of the third preset duration is different from the length of the fourth preset duration.

[0026] Optionally, the length of the third preset duration is greater than the length of the fourth preset duration.

[0027] Optionally, for each of the first preset duration, the third preset duration, and the fourth preset duration, the length of each preset duration is different for UEs with different capabilities.

[0028] Optionally, the method further includes: if the timer associated with the active BWP expires, then perform at least one of the following BWP switches:

[0029] If the carrier where the active BWP is located is not the preset carrier, then switch the active BWP to the first preset BWP on the preset carrier; if the first preset BWP is not configured, then switch the active BWP to the initial BWP on the preset carrier;

[0030] If the active BWP is not the second preset BWP on its carrier, then switch the active BWP to the second preset BWP on its carrier; if the second preset BWP is not configured, then switch the active BWP to the initial BWP on its carrier, or switch the active BWP to the first preset BWP on the preset carrier;

[0031] If the activated BWP is not the third preset BWP on its carrier group, switch the activated BWP to the third preset BWP on its carrier group; if the third preset BWP is not configured, switch the activated BWP to the first preset BWP on a preset carrier.

[0032] Optionally, the first preset BWP is configured by UE-specific RRC signaling; and / or,

[0033] The second preset BWP is configured by UE-specific RRC signaling, and the second preset BWP is configured separately for each carrier; and / or,

[0034] The third preset BWP is configured by UE-specific RRC signaling, and the third preset BWP is configured separately for each carrier group.

[0035] Optionally, the method further includes:

[0036] If the timer associated with the activated BWP expires and the activated BWP is not the second preset BWP on its carrier, switch the activated BWP to the second preset BWP on its carrier; and / or,

[0037] If the timer associated with the activated BWP expires and the activated BWP is the second preset BWP on its carrier, and the carrier where the activated BWP is located is not a preset carrier, switch the activated BWP to the first preset BWP on the preset carrier.

[0038] Optionally, the method further includes:

[0039] If the carrier after switching is configured with multiple BWPs, switch the activated BWP to the fourth preset BWP among the multiple BWPs.

[0040] Optionally, the preset carrier includes at least one of the following:

[0041] Anchored carrier;

[0042] The carrier with the smallest index number;

[0043] A carrier pre-configured by higher layer signaling;

[0044] The first preset BWP, the second preset BWP, the third preset BWP, and / or the fourth preset BWP includes at least one of the following:

[0045] Initial BWP;

[0046] The BWP with the smallest index number;

[0047] A BWP pre-configured by higher layer signaling.

[0048] Optionally, at least two activated BWPs include a first activated BWP and at least one second activated BWP, and at least two activated BWPs include at least one of the following cases:

[0049] The first activated BWP is located on the anchored carrier;

[0050] The PDSCH or PUSCH transmitted on the second activated BWP uses the relevant channel transmission configuration on the first activated BWP;

[0051] The physical downlink control channel PDCCH and / or the physical uplink control channel PUCCH are only transmitted on one BWP among at least two activated BWPs, where the BWP transmitting the PDCCH and / or PUCCH is fixed as the first activated BWP, or is preconfigured as one of at least two activated BWPs;

[0052] The frequency band interval between the first activated BWP and the second activated BWP does not exceed the fifth preset bandwidth;

[0053] Both the first activated BWP and the second activated BWP are included within the sixth preset bandwidth.

[0054] Optionally, the first signaling includes a first DCI, and the first DCI includes the index number of the first activated BWP and / or the index number of the second activated BWP.

[0055] Optionally, whether the first DCI includes the index number of the second activated BWP and / or the number of included second activated BWPs is preconfigured by higher layer signaling.

[0056] Optionally, all BWPs on all carriers of the serving cell where the UE is located are uniformly numbered.

[0057] Optionally, the first DCI further includes the index number of the carrier where the first activated BWP is located and / or the index number of the carrier where the second activated BWP is located.

[0058] Optionally, there is a corresponding relationship between the first BWP and the second BWP, and the second BWP corresponding to the first BWP is preconfigured by higher layer signaling. If the first signaling indicates that the first BWP is activated as the first activated BWP, the second BWP corresponding to the first BWP is also defaultly activated as the second activated BWP.

[0059] Optionally, if the first signaling is used to indicate that a BWP group is activated, all BWPs within the BWP group are activated;

[0060] wherein, the BWP group is preconfigured by higher layer signaling.

[0061] Optionally, the first signaling includes a second DCI, and the second DCI includes the index number of the activated BWP group.

[0062] Optionally, the second DCI includes the index number of the activated BWP set and the index number of the activated BWP, and the index number of the activated BWP set and the index number of the activated BWP are indicated by different state values of the same indication field.

[0063] Optionally, the method further includes:

[0064] receiving second signaling, where the second signaling includes information on whether at least one second activated BWP is in a dormant state;

[0065] wherein the second signaling is indicated by at least one of a MAC CE and a DCI.

[0066] Optionally, the second signaling includes a third DCI, and the third DCI includes at least one of the following information:

[0067] whether each second activated BWP is in a dormant state;

[0068] the duration length of the dormant state of each second activated BWP;

[0069] whether each second activated BWP indicated for multiple UEs is in a dormant state, and / or the duration length of the dormant state.

[0070] Optionally, the third DCI includes an indication field, and one state value of the indication field indicates that the second activated BWP does not enter the dormant state, and other state values of the indication field indicate that the second activated BWP enters the dormant state and lasts for a preset time length corresponding to the state value. Different state values correspond to different preset time lengths, and the preset time length is configured by UE-specific RRC signaling.

[0071] Optionally, the third DCI is transmitted on the first activated BWP.

[0072] Optionally, for each second activated BWP, the method further includes:

[0073] if a timer associated with the second activated BWP expires, switching the second activated BWP to the dormant state.

[0074] Optionally, if the second activated BWP is in the dormant state, the behaviors performed by the UE include at least one of the following:

[0075] stopping the timer associated with the second activated BWP;

[0076] not listening to the PDCCH on the second activated BWP;

[0077] not listening to the PDCCH for scheduling the second activated BWP;

[0078] Do not report channel state information (CSI) on the second active BWP;

[0079] Do not transmit the uplink shared channel (UL-SCH) on the second active BWP;

[0080] Do not transmit the random access channel (RACH) on the second active BWP;

[0081] Do not transmit the physical uplink control channel (PUCCH) on the second active BWP;

[0082] Clear the preconfigured downlink grant and preconfigured type 2 uplink grant on the second active BWP;

[0083] Suspend the preconfigured type 1 uplink grant on the second active BWP.

[0084] Optionally, the method further includes:

[0085] Report the CSI on the second active BWP in the dormant state on other active BWPs that are not in the dormant state.

[0086] Optionally, the method further includes:

[0087] If a BWP switch is performed for any second active BWP in the dormant state, the switched second active BWP continues to remain in the dormant state or exits the dormant state.

[0088] Optionally, the method further includes:

[0089] Monitor the physical downlink control channel (PDCCH) for scheduling all active BWPs on one of the at least two active BWPs;

[0090] Among them, the BWP for monitoring the PDCCH is fixed as the first active BWP, or preconfigured as one of the at least two active BWPs.

[0091] Optionally, the monitored PDCCH includes information related to the scheduled active BWP and / or the carrier where the scheduled active BWP is located.

[0092] Optionally, the downlink control information (DCI) carried by the PDCCH includes scheduling information related to multiple physical downlink shared channels (PDSCHs) or multiple physical uplink shared channels (PUSCHs), and the method further includes:

[0093] Transmit multiple PDSCHs or multiple PUSCHs on the respective allocated resources of the multiple scheduled active BWPs;

[0094] And / or, the DCI carried by the PDCCH includes scheduling information related to one PDSCH or one PUSCH, and the method further includes:

[0095] Transmit a PDSCH or a PUSCH on the total allocated resources of multiple scheduled active BWPs.

[0096] Optionally, the first active BWP includes at least one of the following:

[0097] The active BWP on the anchored carrier;

[0098] The active BWP on the carrier with the smallest index number;

[0099] The active BWP on the carrier with an index number of zero;

[0100] The active BWP with the lowest frequency;

[0101] The active BWP on the pre-configured carrier;

[0102] The active BWP configured for PDCCH and / or PUCCH transmission.

[0103] Optionally, the method further includes:

[0104] Transmit the hybrid automatic repeat request acknowledgment character HARQ-ACK feedback corresponding to the PDSCH on all active BWPs on one of the at least two active BWPs;

[0105] Wherein, the BWP transmitting the HARQ-ACK feedback is fixed as the first active BWP, or pre-configured as one of the at least two active BWPs.

[0106] Optionally, the HARQ-ACK information corresponding to the PDSCH on all active BWPs is included in the same codebook for feedback, wherein the order of the HARQ-ACK information in the codebook is determined according to at least one of the following:

[0107] Arrange the corresponding HARQ-ACK information bits in the order of the index numbers of the active BWPs where the PDSCH is located;

[0108] Arrange the corresponding HARQ-ACK information bits in the order of the index numbers of the carriers where the PDSCH is located;

[0109] Arrange the corresponding HARQ-ACK information bits in the order of the frequency levels of the active BWPs where the PDSCH is located;

[0110] Arrange the corresponding HARQ-ACK information bits in the order before and after the start symbol of the PDSCH.

[0111] Optionally, the method further includes:

[0112] Report to the base station at least one of the following capabilities:

[0113] The ability to support BWP switching, where the BWP before switching and the BWP after switching are on different carriers;

[0114] The ability to support BWP switching, where the BWP before switching and the BWP after switching are on different frequency bands;

[0115] The ability to support transmission on at least two active BWPs, where at least two BWPs are on different carriers;

[0116] The ability to support transmission on at least two active BWPs, where at least two BWPs are on different frequency bands.

[0117] According to another aspect of the embodiments of the present application, another method performed by a UE in a communication system is provided. The method includes:

[0118] Receiving a third signaling, where the third signaling includes information related to switching an active bandwidth part (BWP) from one BWP on one carrier to another BWP on another carrier, and the carrier before switching and the carrier after switching are configured in the same serving cell;

[0119] Performing cross-carrier BWP switching, and on the active BWP after switching, performing uplink transmission or downlink transmission.

[0120] Optionally, the third signaling is indicated by at least one of UE-specific radio resource control (RRC) signaling, a control element (MAC CE) in the media access control layer, and downlink control information (DCI).

[0121] Optionally, performing cross-carrier BWP switching includes at least one of the following conditions:

[0122] The frequency-domain interval between the carrier before switching and the carrier after switching does not exceed a first preset bandwidth;

[0123] Both the carrier before switching and the carrier after switching are included within a second preset bandwidth;

[0124] The frequency-domain interval between the BWP before switching and the BWP after switching does not exceed a third preset bandwidth;

[0125] Both the BWP before switching and the BWP after switching are included within a fourth preset bandwidth.

[0126] Optionally, for each of the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth, the size of each preset bandwidth is different in the FR1 and FR2 scenarios, and / or, the size of each preset bandwidth is different for UEs with different capabilities.

[0127] Optionally, perform a BWP handover across carriers, including:

[0128] Perform the BWP handover within a first preset duration, where the first preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier to another BWP on another carrier;

[0129] Wherein, the length of the first preset duration is different from the length of the second preset duration, and the second preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier to another BWP on the same carrier.

[0130] Optionally, perform a BWP handover across carriers, including at least one of the following:

[0131] If the BWP before the handover and the BWP after the handover are respectively in different frequency bands, perform the BWP handover within a third preset duration, where the third preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within another frequency band;

[0132] If the BWP before the handover and the BWP after the handover are in the same frequency band, perform the BWP handover within a fourth preset duration, where the fourth preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within the same frequency band;

[0133] Wherein, the length of the third preset duration is different from the length of the fourth preset duration.

[0134] Optionally, the length of the third preset duration is greater than the length of the fourth preset duration.

[0135] Optionally, for each of the first preset duration, the third preset duration, and the fourth preset duration, the length of each preset duration is different for UEs with different capabilities.

[0136] Optionally, the method further includes: if the timer associated with the active BWP expires, perform at least one of the following BWP handovers:

[0137] If the carrier where the active BWP is located is not the preset carrier, switch the active BWP to the first preset BWP on the preset carrier; if the first preset BWP is not configured, switch the active BWP to the initial BWP on the preset carrier;

[0138] If the activated BWP is not the second preset BWP on its serving carrier, switch the activated BWP to the second preset BWP on its serving carrier; if the second preset BWP is not configured, switch the activated BWP to the initial BWP on its serving carrier, or switch the activated BWP to the first preset BWP on a preset carrier;

[0139] If the activated BWP is not the third preset BWP on its serving carrier group, switch the activated BWP to the third preset BWP on its serving carrier group; if the third preset BWP is not configured, switch the activated BWP to the first preset BWP on a preset carrier.

[0140] Optionally, the first preset BWP is configured by UE-specific RRC signaling; and / or,

[0141] The second preset BWP is configured by UE-specific RRC signaling, and the second preset BWP is configured separately for each carrier; and / or,

[0142] The third preset BWP is configured by UE-specific RRC signaling, and the third preset BWP is configured separately for each carrier group.

[0143] Optionally, the method further includes:

[0144] If the timer associated with the activated BWP expires and the activated BWP is not the second preset BWP on its serving carrier, switch the activated BWP to the second preset BWP on its serving carrier; and / or,

[0145] If the timer associated with the activated BWP expires, the activated BWP is the second preset BWP on its serving carrier, and the serving carrier of the activated BWP is not a preset carrier, switch the activated BWP to the first preset BWP on a preset carrier.

[0146] Optionally, the method further includes:

[0147] If multiple BWPs are configured for the switched carrier, switch the activated BWP to the fourth preset BWP among the multiple BWPs.

[0148] Optionally, the preset carrier includes at least one of the following:

[0149] An anchored carrier;

[0150] The carrier with the smallest index number;

[0151] A carrier pre-configured by higher layer signaling;

[0152] The first preset BWP, the second preset BWP, the third preset BWP, and / or the fourth preset BWP include at least one of the following:

[0153] Initial BWP;

[0154] The BWP with the smallest index number;

[0155] The BWP preconfigured by higher layer signaling.

[0156] According to another aspect of the embodiments of the present application, there is provided a method executed by a base station in a communication system, the method including:

[0157] Sending a first signaling, where the first signaling includes information related to at least two activated bandwidth parts (BWPs), where the at least two activated BWPs are respectively on different carriers, and the carriers where the at least two activated BWPs are located are configured in the same serving cell;

[0158] Performing uplink transmission or downlink transmission on the at least two activated BWPs.

[0159] According to still another aspect of the embodiments of the present application, there is provided another method executed by a base station in a communication system, the method including:

[0160] Sending a third signaling, where the third signaling includes information related to switching an activated bandwidth part (BWP) from one BWP on one carrier to another BWP on another carrier, where the carrier before the BWP switching and the carrier after the BWP switching are configured in the same serving cell;

[0161] Performing uplink transmission or downlink transmission on the latest activated BWP.

[0162] According to still another aspect of the embodiments of the present application, there is provided a user equipment, the user equipment including:

[0163] A transceiver configured to send and receive signals; and

[0164] A processor coupled to the transceiver and configured to execute the method executed by the UE provided by the embodiments of the present application.

[0165] According to still another aspect of the embodiments of the present application, there is provided a base station, the base station including:

[0166] A transceiver configured to send and receive signals; and

[0167] A processor coupled to the transceiver and configured to execute the method executed by the base station provided by the embodiments of the present application.

[0168] According to still another aspect of the embodiments of the present application, there is provided a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the method executed by the UE or the base station provided by the embodiments of the present application.

[0169] According to another aspect of the embodiments of the present application, a computer program product is provided, including a computer program, which when executed by a processor implements the method executed by the UE or the base station provided in the embodiments of the present application.

[0170] In the communication method, user equipment, and base station provided in the embodiments of the present application, the user equipment may receive a first signaling, where the first signaling includes information related to at least two activated BWPs. Among them, the at least two activated BWPs are respectively on different carriers, and the carriers where the at least two activated BWPs are located are configured in the same serving cell; on the at least two activated BWPs, perform uplink transmission or downlink transmission. That is, in the embodiments of the present application, the UE can use at least two activated BWPs in a serving cell simultaneously for transmission, which is more flexible than aggregating the activated BWPs of multiple serving cells for transmission, can simplify the system more, and save signaling overhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0171] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description in the embodiments of the present application.

[0172] Figure 1 It is a schematic diagram of the overall structure of the wireless network provided in the embodiments of the present application;

[0173] Figure 2a It is a schematic diagram of the transmission path provided in the embodiments of the present application;

[0174] Figure 2b It is a schematic diagram of the reception path provided in the embodiments of the present application;

[0175] Figure 3a It is a schematic diagram of the structure of the UE provided in the embodiments of the present application;

[0176] Figure 3b It is a schematic diagram of the structure of the base station provided in the embodiments of the present application;

[0177] Figure 4 It is a schematic flowchart of a method executed by the UE provided in the embodiments of the present application;

[0178] Figure 5 It is a schematic flowchart of another method executed by the UE provided in the embodiments of the present application;

[0179] Figure 6 It is a schematic flowchart of a method executed by the base station provided in the embodiments of the present application;

[0180] Figure 7 It is a schematic flowchart of another method executed by the base station provided in the embodiments of the present application;

[0181] Figure 8 A schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0182] The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of various embodiments of the present application defined by the claims and their equivalents. This description includes various specific details to facilitate understanding but should only be considered exemplary. Therefore, those of ordinary skill in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0183] The terms and phrases used in the following specification and claims are not limited to their dictionary meanings but are merely used by the inventors to enable a clear and consistent understanding of the present application. Therefore, it should be apparent to those skilled in the art that the following description of the various embodiments of the present application is for illustrative purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0184] It should be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly indicates otherwise. Thus, for example, a reference to "a component surface" includes a reference to one or more such surfaces.

[0185] The term "comprising" or "may comprise" refers to the presence of the corresponding disclosed functions, operations, or components that can be used in various embodiments of the present application, rather than limiting the presence of one or more additional functions, operations, or features. In addition, the term "comprising" or "having" can be interpreted as indicating certain characteristics, numbers, steps, operations, elements, components, or combinations thereof, but should not be interpreted as excluding the possibility of the presence of one or more other characteristics, numbers, steps, operations, elements, components, or combinations thereof.

[0186] The term "or" used in various embodiments of the present application includes any of the listed terms and all combinations thereof. For example, "A or B" can include A, can include B, or can include both A and B.

[0187] Unless otherwise defined, all terms (including technical or scientific terms) used in the present application have the same meaning as understood by those skilled in the art of the present application. Commonly used terms defined in a dictionary are interpreted as having a meaning consistent with the context in the relevant technical field and should not be interpreted idealistically or overly formally unless clearly defined as such in the present application.

[0188] Figure 1 An example wireless network 100 according to various embodiments of the present application is shown.Figure 1 The embodiment of the wireless network 100 shown is for illustrative purposes only. Other embodiments of the wireless network 100 can be used without departing from the scope of this application.

[0189] The wireless network 100 includes gNodeB (gNB) 101, gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a proprietary IP network, or other data networks.

[0190] Depending on the network type, other well-known terms, such as "base station" or "access point", can be used in place of "gNodeB" or "gNB". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to the network infrastructure components that provide wireless access to remote terminals. Also, depending on the network type, other well-known terms, such as "mobile station", "subscriber station", "remote terminal", "wireless terminal", or "user device", can be used in place of "user equipment" or "UE". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to the remote wireless devices that wirelessly access the gNB, whether the UE is a mobile device (such as a mobile phone or smartphone) or a device that is typically considered fixed (such as a desktop computer or vending machine).

[0191] gNB 102 provides wireless broadband access to the network 130 for a plurality of first user equipment (UE) within the coverage area 120 of gNB 102. The plurality of first UEs include: UE 111, which can be located in a small business (SB); UE 112, which can be located in an enterprise (E); UE 113, which can be located in a WiFi hotspot (HS); UE 114, which can be located in a first residence (R); UE 115, which can be located in a second residence (R); UE 116, which can be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. gNB 103 provides wireless broadband access to the network 130 for a plurality of second UEs within the coverage area 125 of gNB 103. The plurality of second UEs include UE 115 and UE 116. In some embodiments, one or more of gNBs 101 - 103 can communicate with each other and with UEs 111 - 116 using 5G, Long Term Evolution (LTE), LTE - A, WiMAX, or other advanced wireless communication technologies.

[0192] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, shown as approximately circular merely for purposes of illustration and explanation. It should be clearly understood that the coverage areas associated with a gNB, such as coverage areas 120 and 125, can have other shapes, including irregular shapes, depending on the configuration of the gNB and changes in the radio environment associated with natural and man-made obstacles.

[0193] As described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present application. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook designs and structures for systems having a 2D antenna array.

[0194] Although Figure 1 an example of a wireless network 100 is shown, various changes can be made Figure 1 thereto. For example, wireless network 100 can include any number of gNBs and any number of UEs arranged in any suitable manner. Also, gNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each of gNBs 102 - 103 can communicate directly with network 130 and provide the UEs with direct wireless broadband access to network 130. Additionally, gNBs 101, 102, and / or 103 can provide access to other or additional external networks, such as an external telephone network or other types of data networks.

[0195] Figure 2a and Figure 2b illustrates an example wireless transmit and receive path according to the present application. In the following description, transmit path 200 can be described as being implemented in a gNB, such as gNB 102, while receive path 250 can be described as being implemented in a UE, such as UE 116. However, it should be understood that receive path 250 can be implemented in a gNB and transmit path 200 can be implemented in a UE. In some embodiments, receive path 250 is configured to support codebook designs and structures for systems having a 2D antenna array as described in embodiments of the present application.

[0196] The transmit path 200 includes a channel coding and modulation block 205, a serial-to-parallel (S-to-P) block 210, an N-point inverse fast Fourier transform (IFFT) block 215, a parallel-to-serial (P-to-S) block 220, a cyclic prefix addition block 225, and an upconverter (UC) 230. The receive path 250 includes a downconverter (DC) 255, a cyclic prefix removal block 260, a serial-to-parallel (S-to-P) block 265, an N-point fast Fourier transform (FFT) block 270, a parallel-to-serial (P-to-S) block 275, and a channel decoding and demodulation block 280.

[0197] In the transmit path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as low-density parity-check (LDPC) coding), and modulates the input bits (such as using quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. The serial-to-parallel (S-to-P) block 210 converts (such as demultiplexes) the serial modulated symbols into parallel data to generate N parallel symbol streams, where N is the number of IFFT / FFT points used in gNB 102 and UE 116. The N-point IFFT block 215 performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial block 220 converts (such as multiplexes) the parallel time-domain output symbols from the N-point IFFT block 215 to generate a serial time-domain signal. The cyclic prefix addition block 225 inserts a cyclic prefix into the time-domain signal. The upconverter 230 modulates (such as upconverts) the output of the cyclic prefix addition block 225 to an RF frequency for transmission via the wireless channel. The signal can also be filtered at baseband before being upconverted to the RF frequency.

[0198] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through the wireless channel, and operations opposite to those at gNB 102 are performed at UE 116. The downconverter 255 downconverts the received signal to baseband frequency, and the cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. The serial-to-parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. The N-point FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. The parallel-to-serial block 275 converts the parallel frequency-domain signals into a sequence of modulated data symbols. The channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0199] Each of gNBs 101-103 may implement a transmission path 200 similar to transmitting to UEs 111-116 in the downlink, and may implement a reception path 250 similar to receiving from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmission path 200 for transmitting to gNBs 101-103 in the uplink, and may implement a reception path 250 for receiving from gNBs 101-103 in the downlink.

[0200] Figure 2a and Figure 2b each of the components in can be implemented using only hardware, or using a combination of hardware and software / firmware. As a specific example, Figure 2a and Figure 2b at least some of the components in can be implemented in software, while other components can be implemented by configurable hardware or a mix of software and configurable hardware. For example, FFT block 270 and IFFT block 215 can be implemented as configurable software algorithms, where the value of the number of points N can be modified according to the implementation.

[0201] Furthermore, although described as using FFT and IFFT, this is merely illustrative and should not be construed as limiting the scope of this application. Other types of transforms can be used, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of the variable N can be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of the variable N can be any integer that is a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0202] Although Figure 2a and Figure 2b show examples of wireless transmission and reception paths, various changes can be made to Figure 2a and Figure 2b . For example, Figure 2a and Figure 2b the various components in can be combined, further subdivided, or omitted, and additional components can be added according to specific needs. Moreover, Figure 2a and Figure 2b are intended to show examples of the types of transmission and reception paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0203] Figure 3a shows an example UE 116 according to the present application. Figure 3a The embodiment of UE 116 shown in is for illustrative purposes only, and Figure 1The UEs 111-115 can have the same or similar configurations. However, UEs have a wide variety of configurations, and Figure 3a does not limit the scope of this application to any particular implementation of the UE.

[0204] UE 116 includes antenna 305, radio frequency (RF) transceiver 310, transmit (TX) processing circuitry 315, microphone 320, and receive (RX) processing circuitry 325. UE 116 also includes speaker 330, processor / controller 340, input / output (I / O) interface (IF) 345, input device(s) 350, display 355, and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0205] RF transceiver 310 receives incoming RF signals transmitted by the gNB of the wireless network 100 from antenna 305. RF transceiver 310 down-converts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, where RX processing circuitry 325 generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 325 sends the processed baseband signal to speaker 330 (such as for voice data) or to processor / controller 340 (such as for web browsing data) for further processing.

[0206] TX processing circuitry 315 receives analog or digital voice data from microphone 320, or other outgoing baseband data (such as network data, email, or interactive video game data) from processor / controller 340. TX processing circuitry 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 310 receives the outgoing processed baseband or IF signal from TX processing circuitry 315 and up-converts the baseband or IF signal to an RF signal transmitted via antenna 305.

[0207] Processor / controller 340 can include one or more processors or other processing devices and execute OS 361 stored in memory 360 to control the overall operation of UE 116. For example, processor / controller 340 can control the reception of forward channel signals and the transmission of reverse channel signals through RF transceiver 310, RX processing circuitry 325, and TX processing circuitry 315 according to well-known principles. In some embodiments, processor / controller 340 includes at least one microprocessor or microcontroller.

[0208] The processor / controller 340 is also capable of executing other processes and programs residing in the memory 360, such as operations for channel quality measurement and reporting for a system with a 2D antenna array as described in embodiments of the present application. The processor / controller 340 can move data into or out of the memory 360 as needed for executing processes. In some embodiments, the processor / controller 340 is configured to execute the application 362 based on the OS 361 or in response to signals received from the gNB or the operator. The processor / controller 340 is also coupled to the I / O interface 345, where the I / O interface 345 provides the UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. The I / O interface 345 is a communication path between these accessories and the processor / controller 340.

[0209] The processor / controller 340 is also coupled to the input device(s) 350 and the display 355. The operator of the UE 116 can use the input device(s) 350 to input data into the UE 116. The display 355 can be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). The memory 360 is coupled to the processor / controller 340. A portion of the memory 360 can include random access memory (RAM), while another portion of the memory 360 can include flash memory or other read-only memory (ROM).

[0210] Although Figure 3a an example of the UE 116 is shown, various changes can be made to Figure 3a it. For example, Figure 3a the various components in Figure 3a can be combined, further subdivided, or omitted, and additional components can be added according to specific needs. As a specific example, the processor / controller 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Moreover, although

[0211] Figure 3b the UE 116 is shown configured as a mobile phone or a smart phone, the UE can be configured to operate as other types of mobile or fixed devices. Figure 3b The embodiment of the gNB 102 shown in Figure 1 is for illustration only, and Figure 3b other gNBs can have the same or similar configurations. However, gNBs have a wide variety of configurations, and

[0212] As shown Figure 3b in FIG. 1, gNB 102 includes a plurality of antennas 370a-370n, a plurality of RF transceivers 372a-372n, a transmit (TX) processing circuit 374, and a receive (RX) processing circuit 376. In some embodiments, one or more of the plurality of antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0213] The RF transceivers 372a-372n receive incoming RF signals from the antennas 370a-370n, such as signals transmitted by a UE or another gNB. The RF transceivers 372a-372n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to the RX processing circuit 376, where the RX processing circuit 376 generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. The RX processing circuit 376 sends the processed baseband signal to the controller / processor 378 for further processing.

[0214] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 378. The TX processing circuit 374 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceivers 372a-372n receive the outgoing processed baseband or IF signal from the TX processing circuit 374 and up-convert the baseband or IF signal to an RF signal transmitted via the antennas 370a-370n.

[0215] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceivers 372a-372n, the RX processing circuit 376, and the TX processing circuit 374 according to well-known principles. The controller / processor 378 can also support additional functions, such as more advanced wireless communication functions. For example, the controller / processor 378 can perform a BIS process, such as through a blind interference sensing (BIS) algorithm, and decode the received signal from which the interference signal has been subtracted. The controller / processor 378 can support any one of a variety of other functions in the gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0216] The controller / processor 378 is also capable of executing programs and other processes resident in the memory 380, such as a basic OS. The controller / processor 378 is also capable of supporting channel quality measurement and reporting for a system with a 2D antenna array as described in embodiments of the present application. In some embodiments, the controller / processor 378 supports communication between entities such as web RTC. The controller / processor 378 can move data into or out of the memory 380 as needed for the execution of processes.

[0217] The controller / processor 378 is also coupled to a backhaul or network interface 382. The backhaul or network interface 382 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or via a network. The backhaul or network interface 382 can support communication via any suitable wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A), the backhaul or network interface 382 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow the gNB 102 to communicate with a larger network (such as the Internet) via a wired or wireless local area network or via a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0218] The memory 380 is coupled to the controller / processor 378. A portion of the memory 380 can include RAM, while another portion of the memory 380 can include flash memory or other ROM. In certain embodiments, multiple instructions such as the BIS algorithm are stored in the memory. The multiple instructions are configured such that the controller / processor 378 performs the BIS process and decodes the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0219] As described in more detail below, the transmit and receive paths of the gNB 102 (implemented using the RF transceivers 372a - 372n, the TX processing circuitry 374, and / or the RX processing circuitry 376) support communication aggregated with FDD cells and TDD cells.

[0220] Although Figure 3b an example of the gNB 102 is shown, various changes can be made to Figure 3b it. For example, the gNB 102 can include any number of Figure 3aEach component shown in [description]. As a specific example, an access point can include a number of backhaul or network interfaces 382, and a controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of TX processing circuitry 374 and a single instance of RX processing circuitry 376, gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0221] To make the objectives, technical solutions, and advantages of this application more clear, the embodiments of this application will be described in further detail below in conjunction with the accompanying drawings.

[0222] In an existing communication system, a serving cell is configured with at most four UE-specific BWPs (Bandwidth Parts), and only one of these BWPs can be activated. The UE transmits signals or channels based on the activated BWP. In a CA / DC system, each carrier where an activated BWP is located corresponds to a serving cell, and multiple carriers and multiple activated BWPs are aggregated by aggregating multiple serving cells.

[0223] However, the embodiments of this application provide a method performed by a UE in a communication system and a method performed by a base station in a communication system. This method is an enhancement of existing multi-carrier technologies, enabling multi-carrier configuration within a serving cell and supporting simultaneous transmission by the UE on multiple carriers within a serving cell. Specifically, in the embodiments of this application, a serving cell is configured with multiple carriers, and the UE can transmit simultaneously on these multiple carriers to obtain a bandwidth gain and significantly increase the peak rate, achieving a similar effect to CA.

[0224] One feasible implementation is that multiple BWPs can be activated within a serving cell, and these multiple activated BWPs are located on different carriers respectively; another feasible implementation is that cross-carrier activation BWP switching can be supported within a serving cell, and the UE obtains diversity gain through cross-carrier dynamic switching transmission.

[0225] The technical solutions of the embodiments of this application and the technical effects produced by the technical solutions of this application will be described below through the description of several exemplary embodiments. It should be noted that the following embodiments can refer to, draw on, or combine with each other. For the same terms, similar features, and similar implementation steps in different embodiments, they will not be described repeatedly.

[0226] In the embodiments of this application, a method performed by a UE in a communication system is provided, as shown in Figure 4 and includes:

[0227] Step S101: Receive a first signaling, where the first signaling includes information related to at least two activated bandwidth parts (BWPs), where the at least two activated BWPs are respectively on different carriers, and the carriers where the at least two activated BWPs are located are configured in the same serving cell;

[0228] Step S102: Perform uplink transmission or downlink transmission on the at least two activated BWPs.

[0229] For example, the performed downlink transmission includes Physical Downlink Shared Channel (PDSCH) transmission, Physical Downlink Control Channel (PDCCH) transmission, and / or Channel State Information Reference Signal (CSI-RS) transmission, etc., and the performed uplink transmission includes Physical Uplink Shared Channel (PUSCH) transmission, Physical Uplink Control Information (PUCCH) transmission, and / or Sounding Reference Signal (SRS) transmission, etc., but is not limited thereto.

[0230] Optionally, the first signaling is indicated by at least one of UE-specific Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE), and Downlink Control Information (DCI).

[0231] That is, for the embodiments of this application, in a serving cell, multiple BWPs can be activated simultaneously, and the multiple activated BWPs are respectively located on different carriers. A transport block (i.e., a PDSCH or a PUSCH) is jointly transmitted by multiple activated carriers (or activated BWPs) in a serving cell, or respective transport blocks (i.e., respective PDSCHs or PUSCHs) are transmitted on each activated carrier (or activated BWP), so as to obtain frequency diversity gain and / or improve the peak rate.

[0232] Optionally, the at least two activated BWPs are respectively located in different frequency bands.

[0233] In the embodiments of the present application, when the operator has more spectrum resources, the transmission rate of the terminal can be improved by aggregating the transmissions of multiple carriers.

[0234] With the method of aggregating multiple active carriers provided in the embodiments of the present application, the UE can activate at least two BWPs in one serving cell for transmission simultaneously, which is more flexible than aggregating the active BWPs of multiple serving cells for transmission, can simplify the system more, and save signaling overhead.

[0235] Specifically, aggregating multiple carriers in one serving cell by aggregating multiple active BWPs has at least one of the following advantages compared with aggregating multiple carriers by the CA method of aggregating multiple serving cells:

[0236] 1. Save broadcast signaling overhead: For example, in a CA system, each serving cell needs to transmit some necessary broadcast signaling such as SSB (Synchronization Signal Block) and SIB1 (System Information Block 1); while for the system of aggregating multiple active BWPs in one serving cell provided in the embodiments of the present application, only the broadcast signaling needs to be transmitted on one carrier.

[0237] 2. Simplify the signaling for carrier activation and carrier aggregation: For example, in a CA system, a secondary cell can be activated through RRC or MAC CE signaling; while for the system of aggregating multiple active BWPs in one serving cell provided in the embodiments of the present application, a BWP can be activated / deactivated through physical layer signaling.

[0238] 3. Simplify mobility measurement and management: For example, in a CA system, mobility measurement and management need to be performed on each serving cell; while for the system of aggregating multiple active BWPs in one serving cell provided in the embodiments of the present application, only mobility measurement and management need to be performed on one carrier (such as an anchor carrier or a pre-configured carrier, etc., but not limited to this) in the serving cell.

[0239] It can be seen from the above analysis that aggregating multiple active BWPs in one serving cell is more flexible than CA / DC, can simplify the system more, and save signaling overhead.

[0240] In addition, in the existing 5G NR (New Radio) communication system, a serving cell can be configured with one downlink carrier and at most two uplink carriers. When a serving cell is configured with two uplink carriers, one of the uplink carriers is called the Normal Uplink (NUL), and the other uplink carrier is called the Supplement Uplink (SUL). The SUL is usually located in a lower frequency band and is used to enhance the coverage of the uplink. The SUL configuration is optional. Although the SUL and the NUL belong to the same serving cell, that is, a serving cell is configured with multiple uplink carriers and the UE can dynamically switch the uplink transmission between the SUL and the NUL, it cannot perform uplink transmission on the SUL and the NUL simultaneously. Therefore, the SUL can only improve the coverage of the uplink, but cannot increase the peak rate of the uplink transmission.

[0241] The embodiments of the present application support a serving cell being configured with multiple downlink carriers and more than two uplink carriers. In addition, the biggest difference between the method of activating multiple carriers in a serving cell provided by the embodiments of the present application and the SUL is that it is possible to use multiple activated carriers in a serving cell to simultaneously perform the transmission of PDSCH or PUSCH, that is, it is possible to transmit a Transport Block (TB) across multiple carriers in a serving cell, that is, a PDSCH or PUSCH is transmitted across multiple carriers in a cell, or, the respective transport blocks are transmitted on multiple carriers in a serving cell, that is, the respective PDSCHs or PUSCHs are transmitted on multiple carriers in a serving cell, so as to obtain frequency diversity gain and / or increase the peak rate.

[0242] In the embodiments of the present application, a BWP essentially refers to a continuous frequency-domain resource, and the BWP can be replaced by other technical terms with the same meaning. For example, the BWP can be replaced by a subband.

[0243] In the embodiments of the present application, a serving cell may also be simply referred to as a cell.

[0244] In an embodiment of the present application, a serving cell may be configured with multiple carriers, and the multiple carriers may be aggregated through physical layer signaling for transmission. Among these multiple carriers, the carrier with system information transmission function and / or initial random access function may be referred to as an anchor carrier, and other carriers are referred to as non-anchor carriers. The base station transmits synchronization information and cell system information on the anchor carrier, such as Cell Defining SynchornizationSignal Block (CD-SSB), and cell system information, where the cell system information includes the first system information block and / or other system information blocks. The base station configures the information of other non-anchor carriers through the anchor carrier. When the anchor carrier is a TDD carrier, the anchor downlink carrier and the anchor uplink carrier are the same anchor carrier; when the anchor carrier is an FDD carrier, the anchor carrier includes an anchor downlink carrier and its paired anchor uplink carrier. On the anchor downlink carrier, the initial downlink BWP is configured, and on the anchor uplink carrier, the PRACH resource pool for accessing the network and the initial uplink BWP are configured. Based on these configuration parameters, the UE can access the network through the anchor carrier.

[0245] In an embodiment of the present application, the UE is configured with multiple carriers, and at least one downlink BWP and / or at least one uplink BWP are configured on each carrier, where these multiple carriers belong to the same serving cell, and the channel transmission of the UE can be dynamically switched among the BWPs of these multiple carriers, that is, the BWP on each carrier can be dynamically activated for channel transmission to achieve the effect of quickly offloading the UE on multiple carriers. The main process includes:

[0246] Step S201: Receive the configuration information of multiple BWPs (downlink BWP or uplink BWP), where these multiple BWPs may be located on different carriers, and these multiple carriers belong to the same serving cell;

[0247] Step S202: Receive DCI, and according to the indication of the DCI, switch the active BWP from one BWP on one carrier to another BWP on another carrier;

[0248] Step S203: Perform PDSCH or PUSCH transmission based on the switched active BWP.

[0249] Optionally, the other BWP to be switched to may be a default BWP. As an example, the DCI may include information related to switching the active BWP from one carrier to another carrier, and the UE performs cross-carrier switching according to the indication of the DCI and switches to the default BWP of another carrier, but it is not limited to this.

[0250] Alternatively, step S102 may specifically include: If at least one of the activated at least two BWPs indicated by the first signaling is different from the previous activated BWP and is not on the same carrier, perform a cross-carrier BWP handover, and perform uplink transmission or downlink transmission on the at least two activated BWPs obtained after performing the BWP handover.

[0251] Optionally, perform a cross-carrier BWP handover for the at least one activated BWP.

[0252] That is, for the embodiments of the present application, the UE can activate at least two BWPs for transmission, and can also, based on the indication of the base station, switch the activated BWP from the first BWP on the first carrier to the second BWP on the second carrier, that is, the first BWP and the second BWP are on different carriers. This kind of BWP handover can be called cross-carrier BWP handover. For the embodiments of the present application, the indication of the base station can be carried by MAC CE and / or DCI.

[0253] In the embodiments of the present application, both cross-carrier BWP handover or aggregated transmission of BWPs require the UE to have corresponding capability support. In order to realize the various benefits of configuring multiple carriers for one serving cell, the UE may report at least one of the following capabilities to the base station:

[0254] (1) The capability to support BWP handover, where the BWP before handover and the BWP after handover are on different carriers, that is, the capability to support cross-carrier BWP handover;

[0255] (2) The capability to support BWP handover, where the BWP before handover and the BWP after handover are in different frequency bands, that is, the capability to support cross-band BWP handover;

[0256] (3) The capability to support transmission on at least two activated BWPs, where at least two BWPs are on different carriers, that is, the capability to support simultaneous activation of BWPs on multiple carriers, and multiple BWPs in one serving cell can be simultaneously activated on different carriers, and the multiple activated BWPs can be used for transmission simultaneously;

[0257] (4) The capability to support transmission on at least two activated BWPs, where at least two BWPs are in different frequency bands, that is, the capability to support simultaneous activation of BWPs in different frequency bands, and multiple BWPs in different frequency bands can be simultaneously activated, and the multiple activated BWPs can be used for transmission simultaneously.

[0258] In the embodiments of the present application, the cross-carrier BWP handover needs to meet preset conditions. Optionally, switching the activated BWP from one BWP on one carrier to another BWP on another carrier includes at least one of the following conditions:

[0259] (1) The frequency-domain interval between the carrier before handover and the carrier after handover does not exceed a first preset bandwidth, where the frequency-domain interval between the carrier before handover and the carrier after handover may refer to the interval between the lowest frequency positions of the two carriers.

[0260] (2) Both the carrier before handover and the carrier after handover are included within a second preset bandwidth, that is, the interval between the lowest frequency position of the lower-frequency carrier and the highest frequency position of the higher-frequency carrier among the two carriers does not exceed the second preset bandwidth.

[0261] (3) The frequency-domain interval between the BWP before handover and the BWP after handover does not exceed a third preset bandwidth, where the frequency-domain interval between the BWP before handover and the BWP after handover may refer to the interval between the lowest frequency positions of the two BWPs.

[0262] (4) Both the BWP before handover and the BWP after handover are included within a fourth preset bandwidth, that is, the interval between the lowest frequency position of the lower-frequency BWP and the highest frequency position of the higher-frequency BWP among the two BWPs does not exceed the fourth preset bandwidth.

[0263] The above preset bandwidths may be related to the frequency band range. Optionally, for each of the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth, the size of each preset bandwidth is different in the FR1 and FR2 scenarios. For example, for the FR1 frequency band, the above preset bandwidth may use a first preset bandwidth (such as 100 MHz), and for the FR2 frequency band, the above preset bandwidth may use a second preset bandwidth (such as 400 MHz). And / or, for UEs with different capabilities, the size of each preset bandwidth is different. In addition, the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth may be the same or different, and the sizes of these preset bandwidths are predefined.

[0264] In the embodiments of the present application, when the UE performs cross-carrier BWP handover, a certain processing delay is required.

[0265] Optionally, when the subcarrier spacing of the two BWPs during handover remains unchanged, performing cross-carrier BWP handover may specifically include: performing BWP handover within a first preset duration, where the first preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier to another BWP on another carrier (i.e., cross-carrier BWP handover); among them, the length of the first preset duration is different from the length of the second preset duration, and the second preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier to another BWP on the same carrier (i.e., in-carrier BWP handover). That is, the processing delay size of cross-carrier BWP handover is different from the processing delay size of in-carrier BWP handover. Optionally, the former is larger.

[0266] Optionally, for cross-carrier BWP switching, according to whether the two carriers for switching belong to the same Band (frequency band), it can be further divided into cross-carrier BWP switching across Bands and cross-carrier BWP switching within a Band. When the subcarrier spacing of the two BWPs for switching remains unchanged, cross-carrier BWP switching is performed, which may specifically include at least one of the following situations:

[0267] If the BWP before switching and the BWP after switching are respectively located in different frequency bands, cross-carrier BWP switching is performed within a third preset duration, and the third preset duration corresponds to the switching delay for switching the active BWP from one BWP of one carrier within one frequency band to another BWP of another carrier within another frequency band (i.e., cross-carrier BWP switching across Bands);

[0268] If the BWP before switching and the BWP after switching are located in the same frequency band, BWP switching is performed within a fourth preset duration, and the fourth preset duration corresponds to the switching delay for switching the active BWP from one BWP of one carrier within one frequency band to another BWP of another carrier within the same frequency band (i.e., cross-carrier BWP switching within a Band).

[0269] Among them, the length of the third preset duration is different from the length of the fourth preset duration.

[0270] Optionally, the length of the third preset duration is greater than the length of the fourth preset duration. That is, the processing delay for cross-carrier switching across Bands is also different from the processing delay for cross-carrier switching within a Band. Optionally, the former is larger.

[0271] In addition, for each of the first preset duration, the third preset duration, and the fourth preset duration (which may refer to the BWP switching gap duration), the length of each preset duration is different for UEs with different capabilities (specifically, the BWP switching capabilities). That is, different UE capabilities can correspond to different BWP switching delays.

[0272] In practical applications, when the subcarrier spacing of the two BWPs for switching remains unchanged, the in-carrier BWP switching delay can correspond to a first preset value, the cross-carrier BWP switching delay within a Band corresponds to a second preset value, and the cross-carrier BWP switching delay across Bands corresponds to a third preset value. Different UE capabilities then correspond to different cross-carrier BWP switching delays, that is, multiple cross-carrier BWP switching delays of different magnitudes can be specified.

[0273] In the embodiments of the present application, the cross-carrier BWP switching can be controlled by a timer. Optionally, after the timer bwp-inactivitytimer expires, if the currently active BWP is not on a preset carrier, then the UE can perform BWP switching. If the UE receives data scheduling or receives a MAC PDU (Protocol Data Unit), then the UE restarts the timer bwp-inactivitytimer. In other words, within the fifth preset duration (i.e., the duration of bwp-inactivitytimer), if the UE has not monitored data scheduling or received a MAC PDU all the time, that is, the bwp-inactivitytimer expires, then the UE performs BWP switching.

[0274] In the embodiments of the present application, the UE monitors data scheduling or receives a MAC PDU on the active BWP, including at least one of the following situations:

[0275] 1) Monitoring, on the active BWP, a PDCCH scrambled with a C-RNTI (Cell-Radio Network Tempory Identity) or a CSI-RNTI (Channel State Information-Radio Network TemporyIdentity) for scheduling a downlink assignment or an uplink grant;

[0276] 2) Monitoring, on the active BWP, a PDCCH scrambled with a G-RNTI (Group common Radio Network TemporyIdentity) or a G-CS-RNTI (Group Configured SchedulingNetwork Tempory Identity) for scheduling a multicast downlink assignment;

[0277] 3) Monitoring a PDCCH scrambled with a C-RNTI or a CSI-RNTI corresponding to the active BWP for scheduling a downlink assignment or an uplink grant;

[0278] 4) Sending, on the active BWP, a MAC PDU corresponding to a preconfigured uplink grant;

[0279] 5) Receiving, on the active BWP, a MAC PDU corresponding to a preconfigured downlink assignment.

[0280] Specifically, if the timer associated with the activated BWP (i.e., bwp-InactivityTimer) expires, the UE may perform at least one of the following BWP switches:

[0281] (1) If the carrier where the activated BWP is located is not the preset carrier, switch the activated BWP to the first preset BWP on the preset carrier; if the first preset BWP is not configured, switch the activated BWP to the initial BWP on the preset carrier.

[0282] (2) If the activated BWP is not the second preset BWP on its carrier, switch the activated BWP to the second preset BWP on its carrier; if the second preset BWP is not configured, switch the activated BWP to the initial BWP on its carrier, or switch the activated BWP to the first preset BWP on the preset carrier.

[0283] (3) If the activated BWP is not the third preset BWP on its carrier group, switch the activated BWP to the third preset BWP on its carrier group; if the third preset BWP is not configured, switch the activated BWP to the first preset BWP on the preset carrier.

[0284] Among them, the first preset BWP is configured by UE-specific RRC signaling; and / or, the second preset BWP is configured by UE-specific RRC signaling, and the second preset BWP is configured separately for each carrier; and / or, the third preset BWP is configured by UE-specific RRC signaling, and the third preset BWP is configured separately for each carrier group.

[0285] As an example, when the timer bwp-inactivitytimer expires, if the currently activated BWP is not located on the default carrier (i.e., the preset carrier), the UE shall switch the activated BWP from the non-default carrier to the default BWP of the default carrier (if the default BWP has been configured by UE-specific RRC signaling), and if the default BWP is not configured, the UE shall switch the activated BWP from the non-default carrier to the initial BWP of the default carrier, and the initial BWP is the first activated BWP on the default carrier.

[0286] As another example, the UE is configured with multiple downlink carriers, and at least one downlink BWP can be configured on each downlink carrier. Among these multiple downlink BWPs, one downlink BWP can be configured as the default downlink BWP for this carrier, which is used for BWP fallback of this carrier. For example, if the bwp-inactivitytimer associated with the active BWP expires and the current active BWP is not the default downlink BWP on its carrier, then the UE will switch the active BWP to the default downlink BWP of the carrier where this downlink BWP is located. If there is no corresponding default downlink BWP configured on the carrier where this downlink BWP is located, then the UE will switch the active BWP to the default downlink BWP of the default carrier (such as the anchored carrier). If there is no default downlink BWP configured on the default carrier (such as the anchored carrier), then the UE will switch the active BWP to the initial downlink BWP of the default carrier (such as the anchored carrier).

[0287] In the embodiments of the present application, the UE can perform BWP switching in the following manner: If the timer associated with the active BWP expires and the active BWP is not the second preset BWP on its carrier, then switch the active BWP to the second preset BWP on its carrier; and / or, if the timer associated with the active BWP expires and the active BWP is the second preset BWP on its carrier, and the carrier where the active BWP is located is not the preset carrier, then switch the active BWP to the first preset BWP on the preset carrier.

[0288] Optionally, the BWP switching process can correspond to at least two timers. If the first timer bwp-InactivityTimer-1 associated with the active BWP expires and the active BWP is not the default BWP (second preset BWP) on its carrier, then switch the active BWP to the default BWP (second preset BWP) on its carrier; and, if the second timer bwp-InactivityTimer-2 associated with the BWP expires, and the active BWP is the second preset BWP on its carrier, the active BWP is the default BWP of its carrier, and the carrier where the active BWP is located is not the preset carrier, then switch the active BWP to the first preset BWP on the preset carrier; where the first timer and the second timer are the same timer, or the first timer and the second timer are different timers, that is, their sizes are configured separately, and their sizes can be different.

[0289] In an embodiment of the present application, if multiple BWPs are configured for the carrier after handover, the UE may switch the active BWP to a fourth preset BWP among the multiple BWPs. The fourth preset BWP may also refer to the default BWP, which is preconfigured through UE-specific RRC signaling. That is, for cross-carrier BWP handover, when switching from one carrier to another, it is necessary to first switch to the default BWP of the other carrier. For example, if the base station instructs the UE to switch from one carrier to another, then the UE switches to the fourth preset BWP of this carrier.

[0290] In the above embodiments, the preset carrier (i.e., the default carrier) includes at least one of the following: the anchored carrier; the carrier with the smallest index number; the carrier preconfigured through higher layer signaling; the first preset BWP, the second preset BWP, the third preset BWP, and / or the fourth preset BWP (all can be understood as the default BWP) includes at least one of the following: the initial BWP; the BWP with the smallest index number; the BWP preconfigured through higher layer signaling.

[0291] In an embodiment of the present application, within a serving cell, the UE may be configured with multiple carriers, and one or more downlink BWPs and / or one or more uplink BWPs may be configured on each carrier. Among them, these multiple carriers belong to the same serving cell, and the uplink BWPs on these multiple carriers can be aggregated for PUSCH transmission, that is, the transmission bandwidth of PUSCH can span the uplink BWPs on multiple carriers, or PUSCH is transmitted separately on the uplink BWPs of these multiple carriers. Both transmission methods can significantly improve the uplink rate of the UE; and / or, the downlink BWPs on these multiple carriers can be aggregated for PDSCH transmission, that is, the transmission bandwidth of PDSCH can span the downlink BWPs on multiple carriers, or PDSCH is transmitted separately on the downlink BWPs of these multiple carriers. Both transmission methods can significantly improve the downlink rate of the UE. The above transmission methods can be implemented by activating multiple BWPs within a serving cell. The main process includes:

[0292] Step S301: Receive the configuration information of one or more BWPs (downlink BWP or uplink BWP) on multiple carriers, where the multiple carriers belong to the same serving cell;

[0293] Step S302: Receive the relevant signaling for activating the BWPs on multiple carriers, where the activated multiple BWPs are located on different carriers respectively;

[0294] Step S303: Perform PDSCH or PUSCH transmission based on the activated multiple BWPs.

[0295] In an embodiment of the present application, a serving cell may be configured with at least two carriers, and at least one BWP may be activated on each carrier. One of the at least two activated BWPs may be referred to as the first BWP, and the other activated BWPs may be referred to as the second activated BWPs, that is, the at least two activated BWPs include one first activated BWP and at least one second activated BWP. Optionally, the at least two activated BWPs include at least one of the following cases:

[0296] (1) The first activated BWP is located on the anchor carrier;

[0297] Among them, the anchor carrier has a system information transmission function and / or an initial random access function; the activated BWP on the anchor carrier may be used as the first activated BWP, and may also be referred to as a normal BWP or a primary BWP, and the BWP on the non-anchor carrier is used as the second activated BWP, and may also be referred to as a supplementary BWP or a secondary BWP.

[0298] Optionally, the first carrier is the carrier with the smallest index number among the carriers where multiple activated BWPs are located; or the first carrier is a carrier pre-configured by higher layer signaling among the carriers where multiple activated BWPs are located.

[0299] (2) The PDSCH or PUSCH transmitted on the second activated BWP uses the relevant channel transmission configuration on the first activated BWP;

[0300] Optionally, the first activated BWP can be independently used for channel transmission, while the second activated BWP cannot be independently used for channel transmission. The second activated BWP is mainly used to supplement the bandwidth of the first activated BWP, that is, the second activated BWP must be attached to the first activated BWP to be used, so as to achieve the purpose of expanding the bandwidth of the first activated BWP. Therefore, the configuration information of the second activated BWP may only include the bandwidth size and frequency domain position information, and does not need to include the relevant information of channel transmission. For example, it does not need to include subcarrier spacing, CORESET (control resource set), PDCCH search space, PDSCH configuration, PUSCH configuration, PUCCH (Physical Uplink Control Channel) configuration and other relevant information. The PDSCH or PUSCH transmitted on the second activated BWP can use the relevant channel transmission configuration on the first activated BWP.

[0301] Optionally, both the first active BWP and the second active BWP can be independently used for channel transmission, that is, the configurations of the first active BWP and the second active BWP can both reuse the existing BWP configurations. If a PDSCH or PUSCH is transmitted on the second active BWP, then the PDSCH or PUSCH uses the relevant channel transmission configuration on the second active BWP; if a PDSCH or PUSCH is transmitted across the first active BWP and the second active BWP, then the PDSCH or PUSCH uses the relevant channel transmission configuration on the first active BWP.

[0302] (3) The PDCCH and / or PUCCH are transmitted only on one of at least two active BWPs, where the BWP for transmitting the PDCCH and / or PUCCH is fixed as the first active BWP, or pre-configured as one of at least two active BWPs;

[0303] Optionally, the UE listens for the PDCCH and / or sends the PUCCH only on the first active BWP, where the PDCCH on the first active BWP can schedule the first active BWP and the second active BWP, and the PUCCH on the first active BWP can transmit the uplink control information related to the first active BWP and the second active BWP; or, the UE listens for the PDCCH and / or sends the PUCCH only on one of multiple active BWPs, where the BWP for listening for the PDCCH and / or sending the PUCCH is a pre-configured BWP among the multiple active BWPs, and the PDCCH listened on this BWP can schedule all active BWPs, and the PUCCH transmitted on this BWP can transmit the uplink control information related to all active BWPs.

[0304] (4) The frequency band interval between the first active BWP and the second active BWP does not exceed the fifth preset bandwidth;

[0305] The transmission of the data channel across multiple BWPs can also be referred to as BWP aggregation transmission. BWP aggregation means the aggregation of a first active BWP and at least one second active BWP, and the transmission of the data channel can be based on the total bandwidth after BWP aggregation. For example, a PDSCH or a PUSCH can be transmitted across the first active BWP and at least one second active BWP. Optionally, the first active BWP aggregates with at most two second active BWPs for channel transmission, and the two second active BWPs are respectively located on both sides of the frequency band of the first active BWP, that is, the first active BWP aggregates with at most one second active BWP above the frequency band, and the first active BWP also aggregates with at most one second active BWP below the frequency band.

[0306] Optionally, only when the frequency band interval between the first active BWP and the second active BWP is less than or equal to a fifth preset bandwidth, which is a standard predefined value, are the first active BWP and the second active BWP allowed to be aggregated together for channel transmission.

[0307] (5) Both the first active BWP and the second active BWP are included within a sixth preset bandwidth.

[0308] Optionally, only when the overall bandwidth of the first active BWP and the second active BWP is less than or equal to a sixth preset bandwidth, which is a standard predefined value, are the first active BWP and the second active BWP allowed to be aggregated together for channel transmission.

[0309] In the embodiments of this application, the first signaling may include a first DCI, and the first DCI includes the index number of the first active BWP and / or the index number of the second active BWP. Optionally, the first DCI may include a first indication field and at least one second indication field. The first indication field is used to indicate the first active BWP, and may also be referred to as the first active BWP indication field. The second indication field is used to indicate the second active BWP, and may also be referred to as the second active BWP indication field;

[0310] That is, both the first active BWP and the second active BWP can be dynamically activated through the first DCI signaling. For example, the first indication field included in the first DCI is used to indicate the index number of the first active BWP, and the second indication field included in the first DCI is used to indicate the index number of the second active BWP.

[0311] Optionally, whether the first DCI includes the index number of the second active BWP and / or the number of included second active BWPs is pre-configured by higher-layer signaling. For example, whether the first DCI includes a second indication field and / or the number of second indication fields included in the DCI is pre-configured by higher-layer signaling.

[0312] Optionally, all BWPs on all carriers within the serving cell of the UE are uniformly numbered. The first indication field included in the first DCI indicates one as the first active BWP from all BWPs, and one or more second indication fields included in the first DCI respectively indicate one or more as the second active BWP from all BWPs. The first DCI can switch between BWPs on different carriers by indicating the index number of the BWP. Among them, the BWPs are numbered in sequence according to the index number of the carrier. For example, the UE is configured with at most Nc carriers, and at most Nb BWPs are configured on each carrier. Then, the UE is configured with a total of Nc * Nb BWPs.

[0313] In an alternative embodiment, the first indication field or the second indication field in the first DCI includes {log2(Nc*Nb)} bits for indicating one BWP from all Nc*Nb BWPs.

[0314] In another alternative embodiment, the base station configures a BWP set including Nt BWPs from Nc*Nb downlink BWPs through RRC signaling or MAC CE signaling, and the first indication field or the second indication field in the first DCI includes {log2(Nt)} bits for indicating one BWP from the pre-configured BWP set.

[0315] As an example, assume Nt = 4. Then the first indication field or the second indication field in the first DCI includes 2 bits for indicating the active BWP. When the indication value of the BWP field is "00", the first BWP in the pre-configured BWP set is activated. When the indication value of the BWP field is "01", the second BWP in the pre-configured BWP set is activated. When the indication value of the BWP field is "10", the third BWP in the pre-configured BWP set is activated. When the indication value of the BWP field is "11", the fourth BWP in the pre-configured BWP set is activated.

[0316] Optionally, only the BWP on the preset carrier (such as the anchor carrier) can be indicated as the first active BWP, and only the BWP on the non-preset carrier (such as the non-anchor carrier) can be indicated as the second active BWP. For example, the BWPs on multiple non-anchor carriers are numbered uniformly. Assume two BWPs are configured on the first non-anchor carrier and two BWPs are configured on the second non-anchor carrier. Then there are a total of 4 BWPs on the non-anchor carriers. The second indication field included in the above first DCI can use 2 bits to indicate one of the 4 BWPs as the second active BWP.

[0317] In the embodiments of the present application, in addition to including the index number of the first active BWP and / or the index number of the second active BWP, the first DCI may further include the index number of the carrier where the first active BWP is located and / or the index number of the carrier where the second active BWP is located. Optionally, the first DCI may further include a third indication field and / or at least one fourth indication field. The third indication field is used to indicate the carrier where the first active BWP is located (such as indicating the index number of the carrier where the first active BWP is located), and the fourth indication field is used to indicate the carrier where the second active BWP is located (such as indicating the index number of the carrier where the second active BWP is located).

[0318] For example, a UE is configured with at most Nc carriers, and at most Nb BWPs are configured on each carrier. The third or fourth indication field in the first DCI includes {log2(Nc)} bits for indicating the index number of the carrier, and the first or second indication field in the first DCI includes {log2(Nb)} bits for indicating the index number of the BWP on the corresponding carrier. Here, {.} represents rounding up. The index number of the anchor carrier can be fixed as #0, and the index numbers of non-anchor carriers start from #1, but this is not limited thereto.

[0319] Optionally, in addition to being configured by higher-layer signaling (RRC signaling and / or MAC CE), the first active BWP can also be dynamically switched through DCI, while the second active BWP cannot be dynamically switched through DCI and can only be configured by higher-layer signaling, that is, the DCI may only include the first active BWP indication field and not include the second active BWP indication field.

[0320] Optionally, there may be a binding relationship between two BWPs. When one of the BWPs (the first BWP) is activated, the other BWP (the second BWP) is also default activated. For example, the corresponding relationship between the first BWP and the second BWP can be configured semi-statically, and the second BWP corresponding to the first BWP is pre-configured by higher-layer signaling. If the first signaling indicates that the first BWP is activated as the first active BWP, the second BWP corresponding to the first BWP is also default activated as the second active BWP.

[0321] In at least one of the above embodiments, BWP aggregation transmission (i.e., one PDSCH or PUSCH is transmitted across multiple active BWPs) can be configured by higher-layer signaling. In addition, the DCI may further include one bit for indicating whether the BWP aggregation transmission configured by higher-layer signaling is applied, that is, the DCI signaling can override the higher-layer signaling. For example, in the case where BWP aggregation transmission is configured by higher-layer signaling, if the DCI indicates that BWP aggregation transmission is applied, the frequency-domain resource allocation field in this DCI is indicated based on the aggregated BWP bandwidth, that is, based on the total bandwidth of the multiple active BWPs; if the DCI indicates that BWP aggregation transmission is not applied, the frequency-domain resource allocation field in this DCI is indicated based on the bandwidth of the first active BWP.

[0322] In the embodiments of the present application, the first signaling can be used to indicate that a BWP group is activated, and all BWPs within the BWP group are activated, where the BWP group is pre-configured by higher-layer signaling.

[0323] Each BWP group includes a first active BWP and at least one second active BWP. The BWP group can also be referred to as a virtual BWP, or a BWP combination, or a BWP aggregation.

[0324] Optionally, the first signaling includes a second DCI, and the second DCI includes an index number of an activated BWP set. Optionally, the second DCI includes a fifth indication field for indicating the activated BWP set (such as indicating the index number of the activated BWP set). That is, the first signaling (such as the second DCI) can activate all BWPs in a BWP set by indicating the index number of the BWP set. For example, two BWP combinations can be configured through higher layer signaling, including a first BWP set with an index number of #0 and a second BWP set with an index number of #1, and the fifth indication field in the second DCI indicates one of the two BWP combinations with 1 bit.

[0325] In addition, the fifth indication field in the second DCI can be used to indicate activating a BWP set or activating a BWP. For example, the second DCI includes the index number of the activated BWP set and the index number of the activated BWP, and the index number of the activated BWP set and the index number of the activated BWP are indicated by different state values of the same indication field. Optionally, a part of the state values of the fifth indication field in the second DCI is used to indicate the activated BWP set (such as indicating the index number of the activated BWP set), and another part of the state values of the fifth indication field is used to indicate the activated BWP (such as indicating the index number of the activated BWP). In other words, the second DCI can dynamically switch between activating multiple BWPs and activating one BWP by indicating the index number of the BWP set or the BWP. For example, the fifth indication field in the second DCI includes 2 bits. When the indication value is "00" or "01", one BWP is activated from two pre-configured BWPs. When the indication value is "10" or "11", one BWP combination is activated from two pre-configured BWP combinations.

[0326] In the embodiments of the present application, a virtual BWP can be defined as a set of discontinuous PRBs across carriers, that is, the virtual BWP can span multiple carriers. The virtual BWP includes a continuous segment of PRBs in each carrier, but the PRBs between adjacent carriers are discontinuous. The virtual BWP and the existing BWP can have similar characteristics. For example, the virtual BWP can reuse the configuration of the existing BWP. The difference is that the PRBs included in the existing BWP are located in one carrier and are continuous, while the PRBs included in the virtual BWP are located in multiple carriers and are discrete between carriers. This difference will affect the way of frequency domain resource allocation. Essentially, the virtual BWP can be understood as the aggregation of segments of frequency domain resources on multiple carriers, that is, the virtual BWP can be understood as the aggregation of multiple BWPs. Therefore, the virtual BWP can also be referred to as BWP aggregation or BWP combination.

[0327] Optionally, the resource scheduling on the virtual BWP can use existing resource allocation types. For example, in the frequency-domain resource allocation type (RA Type) 0, the scheduling DCI indicates the allocated RBG through a bitmap, which can support continuous or discrete RBG resource allocation. One RBG includes X consecutive PRBs. Here, it is necessary to divide all the PRBs across multiple carriers within the virtual BWP into RBGs. To coexist with other scheduled UEs on each carrier (where these other scheduled UEs may only operate on one carrier), the virtual BWP uses different RBG sizes to slice the RBG on each carrier. For example, the RBG size used on each carrier is determined based on the number of PRBs included in the virtual BWP on each carrier; or, the virtual BWP uses the same RBG size to slice the RBG on all carriers. For example, this RBG size is determined based on the total number of PRBs included in the virtual BWP.

[0328] In addition, considering compatibility with other UEs transmitting based on one active carrier, the RBG slicing on each carrier of the virtual BWP should be aligned with the starting position of the first carrier resource block (CRB) of the carrier, that is, the RBG slicing on each carrier of the virtual BWP should be aligned based on the starting position of the CRB0 (i.e., the first CRB) of the carrier; or, the RBG slicing on each carrier of the virtual BWP should be aligned with the starting position of the CRB0 of a reference carrier, and the reference carrier can be the anchored carrier, the carrier with the lowest frequency, the carrier with the smallest index number, or a pre-configured carrier, etc.

[0329] Optionally, the scheduling on the virtual BWP can reuse the existing RA Type 1, that is, the scheduling DCI jointly indicates the starting virtual resource block (VRB) position and the number of consecutive VRBs in the way of the Start and Length Indicator Value (SLIV). There are two mapping methods between VRBs and physical resource blocks (PRBs). The first mapping method is non-interleaved mapping, that is, a group of consecutive VRBs correspond to a group of consecutive PRBs one by one, and resource scheduling only supports the allocation of consecutive PRBs. The second mapping method is interleaved mapping, that is, a group of consecutive VRBs may correspond to a group of discrete PRBs, and resource scheduling can support the allocation of consecutive or discrete PRBs. For the interleaved mapping between VRBs and PRBs, within the virtual BWP, in order to better be compatible with other UEs transmitting based on one carrier service, the VRBs and PRBs within the virtual BWP can be segmented and interleaved mapped. For example, the segmented area can be the PRBs within one carrier, that is, there is an interleaved mapping relationship between a group of consecutive PRBs and the corresponding group of consecutive VRBs within each carrier.

[0330] For example, assume that the virtual BWP is jointly composed of one segment of consecutive PRBs on each of three carriers. The PRBs of the virtual BWP on the first carrier are numbered #0 to #(N1 - 1), that is, the virtual BWP includes a total of N1 PRBs on the first carrier. The PRBs of the virtual BWP on the second carrier are numbered #N1 to #(N2 + N1 - 1), that is, the virtual BWP includes a total of N2 PRBs on the second carrier. The PRBs of the virtual BWP on the third carrier are numbered #(N1 + N2) to #(N3 + N2 + N1 - 1), that is, the virtual BWP includes a total of N3 PRBs on the third carrier. The VRBs and PRBs can be segmented and interleaved mapped. For example, the VRBs numbered within #0 to #(N1 - 1) are mapped to the PRBs numbered within #0 to #(N1 - 1) in an interleaved manner, the VRBs numbered within #N1 to #(N2 + N1 - 1) are mapped to the PRBs numbered within #N1 to #(N2 + N1 - 1) in an interleaved manner, and the VRBs numbered within #(N1 + N2) to #(N3 + N2 + N1 - 1) are mapped to the PRBs numbered within #(N1 + N2) to #(N3 + N2 + N1 - 1) in an interleaved manner. However, the VRB numbered #m does not necessarily correspond to the PRB numbered #m, that is, the VRBs and PRBs are segmented and interleaved mapped, and the segmented interval is within the carrier. Within each carrier, the interleaved mapping rule used can reuse the interleaved mapping rule of the existing system.

[0331] In the embodiments of the present application, the method performed by the UE in the above communication system may further include:

[0332] Step S105: Receive a second signaling, where the second signaling includes information on whether at least one second active BWP is in a dormant state;

[0333] Among them, the second signaling is indicated by at least one of MAC CE and DCI.

[0334] That is to say, among multiple active BWPs, except for a specific active BWP (i.e., the first active BWP), other active BWPs can be indicated as being in a dormant state. Once an active BWP is indicated as being in a dormant state, many signals or channels on that BWP are prohibited from being transmitted. For example, if the second active BWP is in a dormant state, the behaviors performed by the UE include at least one of the following:

[0335] (1) Stop the timer bwp-InactivityTimer associated with the second active BWP;

[0336] (2) Do not monitor the PDCCH on the second active BWP;

[0337] (3) Do not monitor the PDCCH for scheduling the second active BWP;

[0338] (4) Do not report CSI (Channel State Information) on the second active BWP;

[0339] (5) Do not send UL-SCH (Uplink Shared Channel) on the second active BWP;

[0340] (6) Do not send RACH (Random Access Channel) on the second active BWP;

[0341] (7) Do not send PUCCH on the second active BWP;

[0342] (8) Clear the preconfigured downlink authorization and preconfigured type 2 uplink authorization on the second active BWP;

[0343] (9) Suspend (abort) the preconfigured type 1 uplink authorization on the second active BWP.

[0344] Among them, a specific activated BWP (the first activated BWP) includes, but is not limited to, at least one of the following: the activated BWP on the anchor carrier; the activated BWP on the carrier with the smallest index number; the activated BWP on the carrier with an index number of zero; the activated BWP with the lowest frequency; the activated BWP on a pre-configured (such as pre-configured by higher layer signaling) carrier; the activated BWP configured with PDCCH and / or PUCCH transmission; these BWPs cannot be indicated as the dormant state after being activated.

[0345] In the embodiments of the present application, the activated BWP is instructed to enter or leave the dormant state through MAC CE or DCI. In one example, a 1-bit in DCI indicates whether the activated BWP is in the dormant state. For example, when the indication value is "1" (or "0"), it indicates that the corresponding activated BWP does not enter the dormant state (i.e., the normal activated BWP state), and when the indication value is "0" (or "1"), it indicates that the corresponding activated BWP enters the dormant state. If the current state of the activated BWP is different from the state indicated by DCI to enter, then the UE needs to switch the state of the activated BWP. If the current state of the activated BWP is the same as the state indicated by DCI to enter, then the UE only needs to maintain the state of the activated BWP.

[0346] In addition, the second signaling may include a third DCI, and the third DCI includes at least one of the following information:

[0347] Whether each second activated BWP is in the dormant state;

[0348] The duration length of the dormant state of each second activated BWP;

[0349] Whether each second activated BWP indicated for multiple UEs respectively is in the dormant state, and / or the duration length of the dormant state.

[0350] Optionally, the above information may be used alone or in combination. As an example, the third DCI may include at least one of the following indication fields:

[0351] (1) The sixth indication field, and the sixth indication field includes at least one bit, and each bit is used to respectively indicate whether each second activated BWP is in the dormant state;

[0352] As an example, the third DCI may also include multiple (such as N, N>1) bits for respectively indicating whether different activated BWPs are in the dormant state. For example, multiple bits indicate whether the activated BWPs other than a specific activated BWP (i.e., the first activated BWP) are in the dormant state, where each information bit corresponds to an activated BWP.

[0353] (2) The seventh indication field, the seventh indication field includes at least one information block, each information block includes at least two bits, and each information block is used to respectively indicate whether each second active BWP is in a dormant state and the duration length of the dormant state;

[0354] As an example, the base station indicates whether the active BWP enters the dormant state through the third DCI, and after entering the dormant state, it lasts for a preset duration. After the preset duration, the active BWP can exit the dormant state. For example, it is indicated whether the corresponding active BWP enters the dormant state lasting for a preset duration through 1 bit. When the indication value is "1" (or "0"), it indicates that the corresponding active BWP enters the dormant state and lasts for the preset time length. When the indication value is "0" (or "1"), it indicates that the corresponding active BWP does not enter the dormant state (i.e., the normal active BWP state). Among them, the preset time length can be pre-configured through high-layer signaling or indicated through the third DCI.

[0355] Optionally, the third DCI includes an indication field (such as the seventh indication field). One state value of the indication field indicates that the second active BWP does not enter the dormant state, and other state values of the indication field indicate that the second active BWP enters the dormant state and lasts for a preset time length corresponding to the state value. Different state values correspond to different preset time lengths, and the preset time lengths are configured through UE-specific RRC signaling.

[0356] (3) The eighth indication field, the eighth indication field includes at least one information block, and each information block is used to respectively indicate whether at least one second active BWP of different UEs is in a dormant state and / or the duration length of the dormant state;

[0357] The third DCI may also include multiple (for example, M, M>1) information blocks for respectively indicating the dormant states of the active BWPs of different UEs. Each information block includes N bits for respectively indicating whether different active BWPs are in the dormant state and / or indicating that the dormant state will last for a preset time length after entering the dormant state. Among them, each information block corresponds to one UE or UE group, and the UE determines the starting position of its corresponding information block in the third DCI according to the indication of high-layer signaling.

[0358] For the above at least one embodiment, the third DCI is transmitted on the first active BWP. Since the transmission of the third DCI for carrying the BWP dormant state indication information should not be affected by the dormant BWP, the third DCI can be transmitted only on the above-mentioned specific active BWP (i.e., the first active BWP), that is, it cannot be transmitted on those second active BWPs that may be indicated to be in the dormant state. For example, the third DCI is transmitted on the first active BWP of the anchored carrier to indicate the dormant states of the active BWPs on other carriers.

[0359] Alternatively, the third DCI for carrying BWP inactivity status indication information may be transmitted on any active BWP that has not entered the inactivity state (i.e., is in the non-inactivity state). For example, for an active BWP, if PDCCH is configured on the active BWP, the PDCCH for scheduling PDSCH or PUSCH may carry information for indicating whether the active BWP where it is located and / or other active BWPs enter the inactivity state and / or enter the inactivity state for a preset duration.

[0360] In the embodiments of the present application, for each second active BWP, if the timer associated with the second active BWP (i.e., bwp-inactivitytimer) expires, the second active BWP is switched to the inactivity state. Specifically, whether an active BWP enters the inactivity state can be controlled by a timer. For example, multiple BWPs are simultaneously activated, and each second active BWP has a corresponding timer (such as bwp-inactivitytimer or bwp-dormanttimer) for controlling whether to enter the inactivity state. After the timer associated with an active BWP expires, the UE should switch the active BWP to the inactivity state. Here, if the UE receives data scheduling or receives a MAC PDU on an active BWP, then the timer associated with this active BWP is restarted. In other words, within a preset duration (the length of the duration is the size of the timer), if the UE has not detected data scheduling or received a MAC PDU on the active BWP all the time, that is, the timer associated with the active BWP (such as bwp-inactivitytimer or bwp-dormanttimer) expires, then the UE switches the active BWP to the inactivity state.

[0361] In the embodiments of the present application, in order to facilitate the base station to dynamically indicate that a dormant BWP leaves the inactivity state according to the channel state on the dormant BWP, that is, to indicate that a dormant BWP exits the inactivity state (i.e., re-enters the normal active BWP state), the base station may configure or trigger the reporting of the channel state information (Channel Status Information, CSI) of the dormant BWP. Optionally, the CSI on the second active BWP in the inactivity state is reported on other active BWPs that are not in the inactivity state. For example, the base station may configure periodic CSI measurement reporting and / or trigger aperiodic CSI reporting for the dormant BWP, where the PUCCH or PUSCH resources for CSI reporting are configured on other active BWPs.

[0362] In the embodiments of the present application, if BWP switching is performed on any second active BWP in the inactivity state, the switched second active BWP continues to remain in the inactivity state or exits the inactivity state.

[0363] That is, when the activated BWP is indicated to be in the dormant state, the base station can still, through signaling, such as DCI, instruct the dormant activated BWP to switch to another BWP. For example, if the UE has multiple activated BWPs located on different carriers, assuming that the activated BWP on a non-anchor carrier is indicated to be in the dormant state, the UE can receive the signaling for instructing the dormant activated BWP to switch to another BWP from other activated BWPs. In one example, after the UE switches the activated BWP on this non-anchor carrier to another BWP, the other activated BWP should exit the dormant state, that is, be in the normal activated BWP state, that is, when the activated BWP switches, the original dormant state no longer applies; in another example, after the UE switches the activated BWP on this non-anchor carrier to another BWP, the other activated BWP should continue to remain in the dormant state until it receives signaling to indicate leaving the dormant state, or leaves the dormant state after the expiration of the ninth preset duration.

[0364] In the embodiments of the present application, the UE is configured with multiple carriers in a serving cell, and one or more BWPs can be configured on each carrier. The BWPs on multiple carriers can be activated, and at most only one BWP on each carrier is activated. The PDSCH / PUSCH of the activated BWP on the second carrier can be scheduled by the PDCCH of the activated BWP on the first carrier, and this scheduling method is called cross-carrier scheduling.

[0365] In an alternative embodiment, the UE has multiple activated BWPs in a serving cell, and these multiple activated BWPs are located on different carriers respectively. Only one of these multiple activated BWPs is configured with PDCCH transmission, that is, the UE only listens for PDCCH on one of the activated BWPs, and there is no need to listen for PDCCH on all activated BWPs. The PDSCH / PUSCH on the activated BWPs without PDCCH configuration are all scheduled by this PDCCH. That is, listen for the PDCCH for scheduling all activated BWPs on one of the at least two activated BWPs; among them, the BWP that listens for PDCCH is fixed as the first activated BWP, then the activated BWP configured with PDCCH can be the above-mentioned first activated BWP, that is, listen for the PDCCH for scheduling all activated BWPs on the first activated BWP. Among them, the first activated BWP can be the primary activated BWP, the activated BWP with the smallest index number, the activated BWP on the anchor carrier, the activated BWP on the carrier with index number #0, the activated BWP on the carrier with the smallest index number among multiple carriers, the activated BWP on the carrier with the lowest frequency, or a pre-configured activated BWP. Or, the BWP that listens for PDCCH can be pre-configured as one of the at least two activated BWPs.

[0366] Among them, the DCI carried by the PDCCH may include scheduling information related to multiple PDSCHs or multiple PUSCHs, that is, it is used to schedule the transmission of multiple PDSCHs or multiple PUSCHs. These multiple PDSCHs or multiple PUSCHs are scheduled on different active BWPs, that is, the UE can transmit multiple PDSCHs or multiple PUSCHs respectively on the allocated resources of each of the multiple scheduled active BWPs; and / or, the DCI carried by the PDCCH includes scheduling information related to one PDSCH or one PUSCH, that is, it is used to schedule the transmission of one PDSCH or one PUSCH. The PDSCH or PUSCH is scheduled on one active BWP, or the PDSCH or PUSCH is scheduled on multiple active BWPs, that is, the UE can transmit one PDSCH or one PUSCH on the total allocated resources of the multiple scheduled active BWPs.

[0367] Optionally, the monitored PDCCH includes information related to the scheduled active BWP and / or the carrier where the scheduled active BWP is located. Since the scheduling DCI and the scheduled PDSCH or PUSCH may not be on the same carrier, the scheduling DCI may include indication information related to the scheduled active BWP and / or the carrier where the scheduled active BWP is located. The number of scheduled active BWPs may be less than the number of active BWPs. For example, assuming there are a total of 4 active BWPs, for the case of scheduling only one active BWP, the scheduling DCI may include a 2-bit indication field for indicating one of the 4 active BWPs; or, for the case of scheduling one or more active BWPs, the scheduling DCI may include a 4-bit indication field to indicate which of the 4 active BWPs are scheduled by means of a bitmap, that is, each bit corresponds to an active BWP. When the indication value is "1", it means the corresponding active BWP is scheduled, and when the indication value is "0", it means the corresponding active BWP is not scheduled; or, for the case of scheduling one or more active BWPs, the scheduling DCI may include an indication field for indicating the index number of the set of scheduled BWPs, where the set of BWPs is pre-configured by higher-layer signaling.

[0368] In an embodiment of the present application, a UE has multiple activated BWPs within a serving cell, and these multiple activated BWPs are located on different carriers respectively. The HARQ (Hybrid Automatic Repeat Request)-ACK (ACKnowledge Character) feedback corresponding to the PDSCH on the second carrier can be fed back on the first carrier, and this situation is referred to as cross-carrier HARQ-ACK feedback. In addition, other uplink control information can also operate in a similar manner to HARQ-ACK, that is, cross-carrier uplink control information transmission.

[0369] In an alternative embodiment, the HARQ-ACK feedback corresponding to the PDSCH on all activated BWPs can be transmitted on one of the at least two activated BWPs; wherein, the BWP for transmitting the HARQ-ACK feedback is fixed as the first activated BWP, or pre-configured as one of the at least two activated BWPs. That is, the HARQ-ACK corresponding to the PDSCH on multiple activated downlink BWPs can be configured to be transmitted on the same activated uplink BWP.

[0370] Optionally, the HARQ-ACK information corresponding to the PDSCH on all activated BWPs is included in the same codebook for feedback, that is, the HARQ-ACK corresponding to the PDSCH on these multiple activated downlink BWPs can be fed back to the base station based on the same codebook, and the order of the HARQ-ACK information in the codebook is determined in at least one of the following ways:

[0371] (1) Arrange the corresponding HARQ-ACK information bits in the order of the index numbers of the activated BWPs where the PDSCH is located.

[0372] (2) Arrange the corresponding HARQ-ACK information bits in the order of the index numbers of the carriers where the PDSCH is located.

[0373] (3) Arrange the corresponding HARQ-ACK information bits in the order of the frequencies of the activated BWPs where the PDSCH is located from high to low.

[0374] (4) Arrange the corresponding HARQ-ACK information bits in the order before and after the starting symbol of the PDSCH.

[0375] In an embodiment of the present application, a method executed by a UE in a communication system is further provided, as Figure 5 shown, the method includes:

[0376] Step S501: Receive a third signaling, where the third signaling includes information related to switching an active bandwidth part (BWP) from one BWP on one carrier to another BWP on another carrier, and the carrier before switching and the carrier after switching are configured within the same serving cell;

[0377] Step S502: Perform cross-carrier BWP switching, and on the active BWP after switching, perform uplink transmission or downlink transmission;

[0378] Optionally, the third signaling is indicated by at least one of UE-specific RRC signaling, MAC CE, and DCI.

[0379] Optionally, the BWP before switching and the BWP after switching are located in different frequency bands respectively.

[0380] That is, in the embodiment of the present application, the UE only activates one BWP for transmission. Based on the indication of the base station, the UE can perform cross-carrier BWP switching within one serving cell.

[0381] For the embodiment of the present application, the UE obtains diversity gain through cross-carrier dynamic switching transmission, which is also more flexible than aggregating active BWPs of multiple serving cells for transmission, can simplify the system more, and save signaling overhead. For specific advantage analysis, refer to the introduction above and will not be elaborated here.

[0382] In the embodiment of the present application, the UE can also report at least one of the following capabilities to the base station:

[0383] (1) The ability to support BWP switching, where the BWP before switching and the BWP after switching are on different carriers, that is, the ability to support cross-carrier BWP switching;

[0384] (2) The ability to support BWP switching, where the BWP before switching and the BWP after switching are in different frequency bands, that is, the ability to support cross-frequency-band BWP switching;

[0385] (3) The ability to support transmission on at least two active BWPs, where at least two BWPs are on different carriers, that is, the ability to support simultaneous activation of BWPs on multiple carriers, and multiple BWPs in the same serving cell on different carriers can be simultaneously activated, and the activated multiple BWPs can be simultaneously used for transmission;

[0386] (4) The ability to support transmission on at least two active BWPs, where at least two BWPs are in different frequency bands, that is, the ability to support simultaneous activation of BWPs in different frequency bands, and multiple BWPs in different frequency bands can be simultaneously activated, and the activated multiple BWPs can be simultaneously used for transmission.

[0387] In the embodiments of the present application, the cross-carrier BWP switching needs to meet preset conditions. Optionally, switching the active BWP from one BWP on one carrier to another BWP on another carrier includes at least one of the following conditions:

[0388] (1) The frequency domain interval between the carrier before switching and the carrier after switching does not exceed the first preset bandwidth. Herein, the frequency domain interval between the carrier before switching and the carrier after switching may refer to the interval between the lowest frequency positions of the two carriers.

[0389] (2) Both the carrier before switching and the carrier after switching are included within the second preset bandwidth, that is, the interval between the lowest frequency position of the lower-frequency carrier and the highest frequency position of the higher-frequency carrier among the two carriers does not exceed the second preset bandwidth.

[0390] (3) The frequency domain interval between the BWP before switching and the BWP after switching does not exceed the third preset bandwidth. Herein, the frequency domain interval between the BWP before switching and the BWP after switching may refer to the interval between the lowest frequency positions of the two BWPs.

[0391] (4) Both the BWP before switching and the BWP after switching are included within the fourth preset bandwidth, that is, the interval between the lowest frequency position of the lower-frequency BWP and the highest frequency position of the higher-frequency BWP among the two BWPs does not exceed the fourth preset bandwidth.

[0392] The above preset bandwidths may be related to the frequency band range. Optionally, each of the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth has different sizes in the FR1 and FR2 scenarios. For example, for the FR1 frequency band, the above preset bandwidth may use the first preset bandwidth (such as 100 MHz), and for the FR2 frequency band, the above preset bandwidth may use the second preset bandwidth (such as 400 MHz). And / or, each of the preset bandwidths has different sizes for UEs with different capabilities. In addition, the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth may be the same or different, and the sizes of these preset bandwidths are predefined.

[0393] In the embodiments of the present application, the UE needs a certain processing delay to perform cross-carrier BWP switching.

[0394] Optionally, when the subcarrier spacings of the two BWPs for the handover remain unchanged, cross-carrier BWP handover is performed, which may specifically include: performing BWP handover within a first preset duration, where the first preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier to another BWP on another carrier (i.e., cross-carrier BWP handover); wherein, the length of the first preset duration is different from the length of the second preset duration, and the second preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier to another BWP on the same carrier (i.e., intra-carrier BWP handover). That is, the processing delay for cross-carrier BWP handover is different from the processing delay for intra-carrier BWP handover. Optionally, the former is larger.

[0395] Optionally, for cross-carrier BWP handover, according to whether the two carriers for the handover belong to the same Band (frequency band), it can be further divided into cross-Band cross-carrier BWP handover and intra-Band cross-carrier BWP handover. When the subcarrier spacings of the two BWPs for the handover remain unchanged, cross-carrier BWP handover is performed, which may specifically include at least one of the following situations:

[0396] If the BWP before the handover and the BWP after the handover are located in different frequency bands respectively, perform cross-carrier BWP handover within a third preset duration, where the third preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within another frequency band (i.e., cross-Band cross-carrier BWP handover);

[0397] If the BWP before the handover and the BWP after the handover are located in the same frequency band, perform BWP handover within a fourth preset duration, where the fourth preset duration corresponds to the handover delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within the same frequency band (i.e., intra-Band cross-carrier BWP handover).

[0398] Among them, the length of the third preset duration is different from the length of the fourth preset duration.

[0399] Optionally, the length of the third preset duration is greater than the length of the fourth preset duration. That is, the processing delay for cross-Band cross-carrier handover is also different from the processing delay for intra-Band cross-carrier handover. Optionally, the former is larger.

[0400] In addition, for each of the first preset duration, the third preset duration, and the fourth preset duration, the length of each preset duration is different for UEs with different capabilities. That is, different UE capabilities may correspond to different BWP handover delays of different magnitudes.

[0401] In practical applications, when the subcarrier spacing of the two BWPs to be switched remains unchanged, the in-carrier BWP switching delay can correspond to a first preset value, the cross-carrier BWP switching delay within a band corresponds to a second preset value, and the cross-carrier BWP switching delay across bands corresponds to a third preset value. Different UE capabilities correspond to different sizes of cross-carrier BWP switching delays, that is, multiple sizes of cross-carrier BWP switching delays can be specified.

[0402] In the embodiments of the present application, the cross-carrier BWP switching can be controlled by a timer. Optionally, after the timer bwp-inactivitytimer expires, if the currently active BWP is not on the preset carrier, then the UE can perform BWP switching. If the UE receives data scheduling or receives a MAC PDU, then the UE restarts the timer bwp-inactivitytimer. In other words, within the fifth preset duration (i.e., the duration of bwp-inactivitytimer), if the UE has not monitored data scheduling or received a MAC PDU all the time, that is, the bwp-inactivitytimer expires, then the UE performs BWP switching.

[0403] Specifically, if the timer associated with the active BWP (i.e., bwp-InactivityTimer) expires, the UE can perform at least one of the following BWP switches:

[0404] (1) If the carrier where the active BWP is located is not the preset carrier, then switch the active BWP to the first preset BWP on the preset carrier; if the first preset BWP is not configured, then switch the active BWP to the initial BWP on the preset carrier.

[0405] (2) If the active BWP is not the second preset BWP on its carrier, then switch the active BWP to the second preset BWP on its carrier; if the second preset BWP is not configured, then switch the active BWP to the initial BWP on its carrier, or switch the active BWP to the first preset BWP on the preset carrier.

[0406] (3) If the active BWP is not the third preset BWP on its carrier group, then switch the active BWP to the third preset BWP on its carrier group; if the third preset BWP is not configured, then switch the active BWP to the first preset BWP on the preset carrier.

[0407] Among them, the first preset BWP is configured by UE-specific RRC signaling; and / or, the second preset BWP is configured by UE-specific RRC signaling, and the second preset BWP is configured separately for each carrier; and / or, the third preset BWP is configured by UE-specific RRC signaling, and the third preset BWP is configured separately for each carrier group.

[0408] As an example, when the timer bwp-inactivitytimer expires, if the currently active BWP is not on the default carrier (i.e., the preset carrier), then the UE shall switch the active BWP from the non-default carrier to the default BWP of the default carrier (if the default BWP has been configured by UE-specific RRC signaling). If the default BWP is not configured, the UE shall switch the active BWP from the non-default carrier to the initial BWP of the default carrier, and the initial BWP is the first active BWP on the default carrier.

[0409] As another example, the UE is configured with multiple downlink carriers, and at least one downlink BWP can be configured on each downlink carrier. Among these multiple downlink BWPs, one downlink BWP can be configured as the default downlink BWP of this carrier for BWP fallback of this carrier. For example, if the bwp-inactivitytimer associated with the active BWP expires and the current active BWP is not the default downlink BWP on its carrier, then the UE switches the active BWP to the default downlink BWP of the carrier where this downlink BWP is located. If there is no corresponding default downlink BWP configured on the carrier where this downlink BWP is located, then the UE switches the active BWP to the default downlink BWP of the default carrier (such as the anchor carrier). If there is no default downlink BWP configured on the default carrier (such as the anchor carrier), then the UE switches the active BWP to the initial downlink BWP of the default carrier (such as the anchor carrier).

[0410] In the embodiments of the present application, the UE may perform BWP switching in the following manner: If the timer associated with the active BWP expires and the active BWP is not the second preset BWP on its serving carrier, then switch the active BWP to the second preset BWP on its serving carrier; and / or, if the timer associated with the active BWP expires and the active BWP is the second preset BWP on its serving carrier and the serving carrier of the active BWP is not the preset carrier, then switch the active BWP to the first preset BWP on the preset carrier. Optionally, the BWP switching process may correspond to at least two timers. If the first timer bwp-InactivityTimer-1 associated with the active BWP expires and the active BWP is not the default BWP (the second preset BWP) on its serving carrier, then switch the active BWP to the default BWP (the second preset BWP) on its serving carrier; and, if the second timer bwp-InactivityTimer-2 associated with the BWP expires and the active BWP is the second preset BWP on its serving carrier, the active BWP is the default BWP of its serving carrier, and the serving carrier of the active BWP is not the preset carrier, then switch the active BWP to the first preset BWP on the preset carrier; where the first timer and the second timer are the same timer, or the first timer and the second timer are different timers, that is, their sizes are configured separately and can be different.

[0411] In the embodiments of the present application, if multiple BWPs are configured for the serving carrier after the handover, the UE may switch the active BWP to the fourth preset BWP among the multiple BWPs. The fourth preset BWP may also refer to the default BWP and is preconfigured by UE-specific RRC signaling. That is, for cross-carrier BWP switching, when switching from one carrier to another carrier, it is necessary to first switch to the default BWP of the other carrier. For example, if the base station instructs the UE to switch from one carrier to another carrier, then the UE switches to the fourth preset BWP of this carrier.

[0412] In the above embodiments, the preset carrier (i.e., the default carrier) includes at least one of the following: the anchored carrier; the carrier with the smallest index number; the carrier preconfigured by higher layer signaling; the first preset BWP, the second preset BWP, the third preset BWP, and / or the fourth preset BWP (all of which can be understood as the default BWP) includes at least one of the following: the initial BWP; the BWP with the smallest index number; the BWP preconfigured by higher layer signaling.

[0413] The method performed by the UE provided in the embodiments of the present application enables the UE to activate at least two BWPs in one serving cell for transmission simultaneously, or to obtain diversity gain through cross-carrier dynamic switching transmission, which is more flexible than aggregating the active BWPs of multiple serving cells for transmission, can simplify the system more, and save signaling overhead.

[0414] In an embodiment of the present application, a method executed by a base station in a communication system is further provided. As Figure 6 shown, the method includes:

[0415] Step S601: Transmit a first signaling, where the first signaling includes information related to at least two activated bandwidth parts (BWPs), where the at least two activated BWPs are respectively on different carriers, and the carriers where the at least two activated BWPs are located are configured in the same serving cell;

[0416] Step S602: Perform uplink transmission or downlink transmission on the at least two activated BWPs;

[0417] Wherein, the first signaling is indicated by at least one of UE-specific RRC signaling, MAC CE, and downlink DCI.

[0418] Optionally, each of the at least two activated BWPs is located in a different frequency band.

[0419] Optionally, performing uplink transmission or downlink transmission on the at least two activated BWPs includes: If at least one of the at least two activated BWPs indicated by the first signaling is different from the previous activated BWP and not on the same carrier, the first signaling is used to instruct the UE to perform cross-carrier BWP switching, and the base station performs uplink transmission or downlink transmission on the latest activated BWP.

[0420] Optionally, performing cross-carrier BWP switching includes at least one of the following conditions:

[0421] The frequency domain interval between the carrier before BWP switching and the carrier after BWP switching does not exceed a first preset bandwidth;

[0422] Both the carrier before BWP switching and the carrier after BWP switching are included within a second preset bandwidth;

[0423] The frequency domain interval between the BWP before switching and the BWP after switching does not exceed a third preset bandwidth;

[0424] Both the BWP before switching and the BWP after switching are included within a fourth preset bandwidth.

[0425] Optionally, for each of the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth, the size of each preset bandwidth is different in FR1 and FR2 scenarios, and / or, the size of each preset bandwidth is different for UEs with different capabilities.

[0426] Optionally, performing cross-carrier BWP switching includes:

[0427] Perform BWP switching within a first preset duration, where the first preset duration corresponds to the switching delay for switching the active BWP from one BWP on one carrier to another BWP on another carrier;

[0428] Wherein, the length of the first preset duration is different from the length of the second preset duration, and the second preset duration corresponds to the switching delay for switching the active BWP from one BWP on one carrier to another BWP on the same carrier.

[0429] Optionally, performing cross-carrier BWP switching includes at least one of the following:

[0430] If the BWP before switching and the BWP after switching are located in different frequency bands respectively, perform cross-carrier BWP switching within a third preset duration, where the third preset duration corresponds to the switching delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within another frequency band;

[0431] If the BWP before switching and the BWP after switching are in the same frequency band, perform cross-carrier BWP switching within a fourth preset duration, where the fourth preset duration corresponds to the switching delay for switching the active BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within the same frequency band;

[0432] Optionally, the length of the third preset duration is different from the length of the fourth preset duration.

[0433] Optionally, the length of the third preset duration is greater than the length of the fourth preset duration.

[0434] Optionally, for each of the first preset duration, the third preset duration, and the fourth preset duration, the length of each preset duration is different for UEs with different capabilities.

[0435] Optionally, the preset carrier includes at least one of the following:

[0436] Anchored carrier;

[0437] The carrier with the smallest index number;

[0438] A carrier pre-configured by higher layer signaling;

[0439] The first preset BWP, the second preset BWP, the third preset BWP, and / or the fourth preset BWP include at least one of the following:

[0440] Initial BWP;

[0441] The BWP with the smallest index number;

[0442] A BWP preconfigured by high-layer signaling.

[0443] Optionally, at least two activated BWPs include a first activated BWP and at least one second activated BWP, and at least two activated BWPs include at least one of the following cases:

[0444] The first activated BWP is located on the anchor carrier;

[0445] The PDSCH or PUSCH transmitted on the second activated BWP uses the transmission configuration of the relevant channel on the first activated BWP;

[0446] The PDCCH and / or PUCCH are only transmitted on one BWP among at least two activated BWPs, where the BWP transmitting the PDCCH and / or PUCCH is fixed as the first activated BWP, or preconfigured as one of at least two activated BWPs;

[0447] The frequency band interval between the first activated BWP and the second activated BWP does not exceed the fifth preset bandwidth;

[0448] Both the first activated BWP and the second activated BWP are included within the sixth preset bandwidth.

[0449] Optionally, the first signaling includes a first DCI, and the first DCI includes the index number of the first activated BWP and / or the index number of the second activated BWP;

[0450] Among them, whether the first DCI includes the index number of the second activated BWP and / or the number of included second activated BWPs is preconfigured by high-layer signaling.

[0451] Optionally, all BWPs on all carriers of the serving cell where the UE is located are uniformly numbered.

[0452] Optionally, the first DCI further includes the index number of the carrier where the first activated BWP is located and / or the index number of the carrier where the second activated BWP is located.

[0453] Optionally, there is a corresponding relationship between the first BWP and the second BWP, and the second BWP corresponding to the first BWP is preconfigured by high-layer signaling. If the first signaling indicates that the first BWP is activated as the first activated BWP, the second BWP corresponding to the first BWP is also default-activated as the second activated BWP.

[0454] Optionally, if the first signaling is used to indicate that a BWP group is activated, all BWPs within the BWP group are activated;

[0455] Among them, the BWP group is preconfigured by high-layer signaling.

[0456] Optionally, the first signaling includes a second DCI, and the second DCI includes a fifth indication field for indicating an active BWP set.

[0457] Optionally, the second DCI includes the index number of the active BWP set and the index number of the active BWP, and the index number of the active BWP set and the index number of the active BWP are indicated by different status values of the same indication field.

[0458] Optionally, the method further includes:

[0459] sending a second signaling, where the second signaling includes information on whether at least one second active BWP is in a dormant state;

[0460] wherein the second signaling is indicated by at least one of a MAC CE and a DCI.

[0461] Optionally, the second signaling includes a third DCI, and the third DCI includes at least one of the following information:

[0462] whether each second active BWP is in a dormant state;

[0463] the duration length of the dormant state of each second active BWP;

[0464] whether each second active BWP indicated for multiple UEs is in a dormant state and / or the duration length of the dormant state.

[0465] Optionally, the third DCI includes an indication field, where one status value of the indication field indicates that the second active BWP does not enter the dormant state, and other status values of the indication field indicate that the second active BWP enters the dormant state and lasts for a preset time length corresponding to the status value. Different status values correspond to different preset time lengths, and the preset time lengths are configured by UE-specific RRC signaling.

[0466] Optionally, the third DCI is transmitted on the first active BWP.

[0467] Optionally, for each second active BWP, the method further includes:

[0468] if the timer associated with the second active BWP expires, switching the second active BWP to the dormant state.

[0469] Optionally, if the second active BWP is in the dormant state, the behaviors performed by the UE include at least one of the following:

[0470] stopping the timer associated with the second active BWP;

[0471] not listening for PDCCH on the second active BWP;

[0472] Do not monitor the PDCCH for scheduling the second active BWP;

[0473] Do not report CSI on the second active BWP;

[0474] Do not send UL-SCH on the second active BWP;

[0475] Do not send RACH on the second active BWP;

[0476] Do not send PUCCH on the second active BWP;

[0477] Clear the preconfigured downlink grant and preconfigured type 2 uplink grant on the second active BWP;

[0478] Suspend the preconfigured type 1 uplink grant on the second active BWP.

[0479] Optionally, the method further includes: receiving CSI on an active BWP that is not in the dormant state from the second active BWP that is in the dormant state.

[0480] Optionally, the method further includes: if BWP switching is performed for any second active BWP in the dormant state, the switched second active BWP continues to remain in the dormant state or exits the dormant state.

[0481] Optionally, the method further includes:

[0482] Send the PDCCH for scheduling all active BWPs on one of the at least two active BWPs;

[0483] Wherein, the BWP for sending the PDCCH is fixed as the first active BWP, or preconfigured as one of the at least two active BWPs.

[0484] Optionally, the sent PDCCH includes information related to the scheduled active BWP and / or the carrier where the scheduled active BWP is located.

[0485] Optionally, the DCI carried by the above PDCCH includes scheduling information related to multiple PDSCHs or multiple PUSCHs, and the method further includes:

[0486] Transmit multiple PDSCHs or multiple PUSCHs respectively on the allocated resources of the respective multiple scheduled active BWPs;

[0487] And / or, the DCI carried by the PDCCH includes scheduling information related to one PDSCH or one PUSCH, and the method further includes:

[0488] Transmit one PDSCH or one PUSCH on the total allocated resources of the multiple scheduled active BWPs.

[0489] Optionally, the first active BWP includes at least one of the following:

[0490] The active BWP on the anchor carrier;

[0491] The active BWP on the carrier with the smallest index number;

[0492] The active BWP on the carrier with an index number of zero;

[0493] The active BWP with the lowest frequency;

[0494] The active BWP on a pre-configured carrier;

[0495] The active BWP configured with PDCCH and / or PUCCH transmission.

[0496] Optionally, the method further includes:

[0497] Receiving HARQ-ACK feedback corresponding to PDSCHs on all active BWPs on one of the at least two active BWPs;

[0498] wherein the BWP for transmitting the HARQ-ACK feedback is fixed to the first active BWP or pre-configured as one of the at least two active BWPs.

[0499] Optionally, the HARQ-ACK information corresponding to PDSCHs on all active BWPs is included in the same codebook for feedback, wherein the order of the HARQ-ACK information in the codebook is determined according to at least one of the following:

[0500] Arranging the corresponding HARQ-ACK information bits in the order of the index numbers of the active BWPs where the PDSCHs are located;

[0501] Arranging the corresponding HARQ-ACK information bits in the order of the index numbers of the carriers where the PDSCHs are located;

[0502] Arranging the corresponding HARQ-ACK information bits in the order of the frequencies of the active BWPs where the PDSCHs are located;

[0503] Arranging the corresponding HARQ-ACK information bits in the order of the start symbols of the PDSCHs.

[0504] Optionally, the method further includes:

[0505] Accepting at least one of the following capabilities reported by the UE:

[0506] The capability to support BWP switching, where the BWP before switching and the BWP after switching are on different carriers;

[0507] The ability to support BWP switching, where the BWP before switching and the BWP after switching are in different frequency bands;

[0508] The ability to support transmission on at least two active BWPs, where at least two BWPs are on different carriers;

[0509] The ability to support transmission on at least two active BWPs, where at least two BWPs are in different frequency bands.

[0510] In the embodiments of this application, another method executed by a base station in a communication system is also provided, as Figure 7 shown, this method includes:

[0511] Step S701: Transmit a third signaling, where the third signaling includes information related to switching the active bandwidth part BWP from one BWP on one carrier to another BWP on another carrier, where the carrier before BWP switching and the carrier after BWP switching are configured in the same serving cell;

[0512] Step S702: Perform uplink transmission or downlink transmission on the latest active BWP.

[0513] Optionally, the third signaling is indicated by at least one of UE-specific RRC signaling, MAC CE, and DCI.

[0514] Optionally, the BWP before switching and the BWP after switching are in different frequency bands respectively.

[0515] Optionally, switching the active BWP from one BWP on one carrier to another BWP on another carrier includes at least one of the following conditions:

[0516] The frequency-domain interval between the carrier before BWP switching and the carrier after BWP switching does not exceed a first preset bandwidth;

[0517] Both the carrier before BWP switching and the carrier after BWP switching are included within a second preset bandwidth;

[0518] The frequency-domain interval between the BWP before switching and the BWP after switching does not exceed a third preset bandwidth;

[0519] Both the BWP before switching and the BWP after switching are included within a fourth preset bandwidth.

[0520] Optionally, each of the first preset bandwidth, the second preset bandwidth, the third preset bandwidth, and / or the fourth preset bandwidth has different sizes in FR1 and FR2 scenarios, and / or, for UEs with different capabilities, the sizes of each preset bandwidth are different.

[0521] In the method implemented by the base station provided in the embodiments of the present application, the UE can activate at least two BWPs in one serving cell for transmission simultaneously, or obtain diversity gain through cross-carrier dynamic switching transmission, which is more flexible than aggregating the activated BWPs of multiple serving cells for transmission, can simplify the system more, and save signaling overhead.

[0522] In the embodiments of the present application, an electronic device is provided, including a transceiver configured to send and receive signals, and a processor coupled to the transceiver and configured to implement the steps of the foregoing method embodiments. Optionally, the electronic device may refer to the UE, and the processor is configured to implement the steps of the method embodiments executed by the UE. For the detailed function description and the beneficial effects produced, reference may specifically be made to the descriptions in the method embodiments executed by the UE in the foregoing text, and details are not described herein again. Optionally, the electronic device may refer to the base station, and the processor is configured to implement the steps of the method embodiments executed by the base station. For the detailed function description and the beneficial effects produced, reference may specifically be made to the descriptions in the method embodiments executed by the base station in the foregoing text, and details are not described herein again. In practical applications, the UE or the base station may be understood as different network nodes.

[0523] In the embodiments of the present application, an electronic device is further provided. The electronic device includes a processor, and optionally, may further include a transceiver and / or a memory coupled to the processor. The processor is configured to execute the steps of the method provided in any optional embodiment of the present application.

[0524] Figure 8 The structural schematic diagram of an electronic device applicable to the embodiments of the present invention is shown, as Figure 8 shown, Figure 8 As shown, the electronic device 4000 includes a processor 4001 and a memory 4003. Among them, the processor 4001 and the memory 4003 are connected, such as through a bus 4002. Optionally, the electronic device 4000 may further include a transceiver 4004, and the transceiver 4004 may be used for data interaction between the electronic device and other electronic devices, such as sending and / or receiving data, etc. It should be noted that in practical applications, the transceiver 4004 is not limited to one, and the structure of the electronic device 4000 does not constitute a limitation to the embodiments of the present application. Optionally, the electronic device may be a first network node, a second network node, or a third network node.

[0525] The processor 4001 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in connection with the disclosure of this application. The processor 4001 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0526] The bus 4002 may include a path for transmitting information between the above components. The bus 4002 may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 4002 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 only a thick line is used to represent it here, but it does not mean that there is only one bus or one type of bus.

[0527] The memory 4003 may be a ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, a RAM (Random Access Memory) or other type of dynamic storage device that can store information and instructions, or it may also be an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, other magnetic storage devices, or any other medium that can be used to carry or store computer programs and can be read by a computer, which is not limited here.

[0528] The memory 4003 is used to store the computer program for implementing the embodiments of the present application, and is controlled by the processor 4001 to execute. The processor 4001 is used to execute the computer program stored in the memory 4003 to implement the steps shown in the foregoing method embodiments.

[0529] The embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps and corresponding contents of the foregoing method embodiments can be implemented.

[0530] The embodiments of the present application further provide a computer program product, including a computer program. When the computer program is executed by a processor, the steps and corresponding contents of the foregoing method embodiments can be implemented.

[0531] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the specification, claims and the above drawings of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than that shown or described in words.

[0532] It should be understood that although the flowchart of the embodiments of the present application indicates each operation step by an arrow, the execution order of these steps is not limited to the order indicated by the arrow. Unless there is a clear description in this article, in some implementation scenarios of the embodiments of the present application, the implementation steps in each flowchart can be executed in other orders according to requirements. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage of these sub-steps or stages can also be executed at different times. In the scenario where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and the embodiments of the present application do not limit this.

[0533] The above text and drawings are only provided as examples to help the reader understand the present application. They are not intended and should not be construed as limiting the scope of the present application in any way. Although certain embodiments and examples have been provided, it is obvious to those skilled in the art based on the content disclosed herein that the shown embodiments and examples can be changed without departing from the scope of the present application, and other similar implementation means based on the technical idea of the present application can be adopted, which also belong to the protection scope of the embodiments of the present application.

Claims

1. A method performed by a User Equipment (UE) in a communication system, characterized in that, Comprising: Receiving a first signaling, where the first signaling includes information related to at least two activated bandwidth parts (BWPs), and among them, the at least two activated BWPs are respectively on different carriers, and the carriers where the at least two activated BWPs are located are configured within the same serving cell; Performing uplink transmission or downlink transmission on the at least two activated BWPs.

2. The method according to claim 1, wherein Performing uplink transmission or downlink transmission on the at least two activated BWPs includes: If at least one of the at least two activated BWPs indicated by the first signaling is different from the previous activated BWP and not on the same carrier, performing a cross-carrier BWP handover, and performing uplink transmission or downlink transmission on the at least two activated BWPs obtained after performing the BWP handover.

3. The method according to claim 2, characterized in that, The performing of the cross-carrier BWP handover includes at least one of the following conditions: The frequency-domain interval between the carrier before handover and the carrier after handover does not exceed a first preset bandwidth; Both the carrier before handover and the carrier after handover are included within a second preset bandwidth; The frequency-domain interval between the BWP before handover and the BWP after handover does not exceed a third preset bandwidth; Both the BWP before handover and the BWP after handover are included within a fourth preset bandwidth.

4. The method according to claim 2, wherein The performing of the cross-carrier BWP handover includes: Performing the BWP handover within a first preset duration, where the first preset duration corresponds to the handover delay for switching the activated BWP from one BWP on one carrier to another BWP on another carrier; Among them, the length of the first preset duration is different from the length of a second preset duration, and the second preset duration corresponds to the handover delay for switching the activated BWP from one BWP on one carrier to another BWP on the same carrier.

5. The method according to claim 2, characterized in that, The performing of the cross-carrier BWP handover includes at least one of the following: If the BWP before handover and the BWP after handover are respectively in different frequency bands, performing the cross-carrier BWP handover within a third preset duration, where the third preset duration corresponds to the handover delay for switching the activated BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within another frequency band; If the BWP before handover and the BWP after handover are in the same frequency band, performing the cross-carrier BWP handover within a fourth preset duration, where the fourth preset duration corresponds to the handover delay for switching the activated BWP from one BWP on one carrier within one frequency band to another BWP on another carrier within the same frequency band; Among them, the length of the third preset duration is different from the length of the fourth preset duration.

6. The method according to any one of claims 1-5, characterized in that, Further comprising: If the timer associated with the activated BWP expires, performing at least one of the following BWP handovers: If the carrier where the activated BWP is located is not the preset carrier, switching the activated BWP to the first preset BWP on the preset carrier; If the first preset BWP is not configured, switching the activated BWP to the initial BWP on the preset carrier. If the active BWP is not the second preset BWP on its serving carrier, switch the active BWP to the second preset BWP on its serving carrier; If the second preset BWP is not configured, switch the active BWP to the initial BWP on its serving carrier, or switch the active BWP to the first preset BWP on the preset carrier; If the active BWP is not the third preset BWP on its serving carrier group, switch the active BWP to the third preset BWP on its serving carrier group; If the third preset BWP is not configured, switch the active BWP to the first preset BWP on the preset carrier.

7. The method according to claim 6, wherein The preset carrier includes at least one of the following: Anchored carrier; The carrier with the smallest index number; A carrier pre-configured by higher layer signaling; The first preset BWP, second preset BWP, third preset BWP, and / or fourth preset BWP includes at least one of the following: Initial BWP; The BWP with the smallest index number; A BWP pre-configured by higher layer signaling.

8. The method according to any one of claims 1-7, characterized in that, The at least two active BWPs include a first active BWP and at least one second active BWP. The at least two active BWPs include at least one of the following cases: The first active BWP is located on an anchored carrier; The PDSCH or PUSCH transmitted on the second active BWP uses the relevant channel transmission configuration on the first active BWP; The physical downlink control channel PDCCH and / or the physical uplink control channel PUCCH are only transmitted on one BWP among the at least two active BWPs. Among them, the BWP transmitting the PDCCH and / or PUCCH is fixed as the first active BWP, or pre-configured as one of the at least two active BWPs; The frequency band interval between the first active BWP and the second active BWP does not exceed the fifth preset bandwidth; Both the first active BWP and the second active BWP are included within the sixth preset bandwidth.

9. The method according to claim 8, wherein The first signaling includes a first DCI, and the first DCI includes the index number of the first active BWP and / or the index number of the second active BWP.

10. The method according to claim 9, wherein The first DCI further includes the index number of the carrier where the first active BWP is located and / or the index number of the carrier where the second active BWP is located.

11. The method according to claim 8, wherein There is a corresponding relationship between the first BWP and the second BWP. The second BWP corresponding to the first BWP is pre-configured by higher layer signaling. If the first signaling indicates that the first BWP is activated as the first active BWP, the second BWP corresponding to the first BWP is also default-activated as the second active BWP.

12. The method according to claim 8, wherein If the first signaling is used to indicate that a BWP group is activated, all BWPs within the BWP group are activated; Among them, the BWP group is pre-configured by higher layer signaling.

13. The method according to any one of claims 8-12, characterized in that, The method further includes: Receiving a second signaling, where the second signaling includes information on whether the at least one second active BWP is in a dormant state; Among them, the second signaling is indicated by at least one of MAC CE and DCI.

14. The method according to claim 13, wherein The second signaling includes a third DCI, and the third DCI includes at least one of the following information: Whether each second active BWP is in a dormant state; The duration length of the dormant state of each second active BWP; Whether each second active BWP indicated for multiple UEs is in a dormant state and / or the duration length of the dormant state.

15. The method according to any one of claims 8-14, characterized in that, It further includes: Listening for the PDCCH for scheduling all active BWPs on one of the at least two active BWPs; Wherein, the BWP for listening for the PDCCH is fixed as the first active BWP, or pre-configured as one of the at least two active BWPs.

16. The method according to any one of claims 8-15, characterized in that, The first active BWP includes at least one of the following: The active BWP on the anchored carrier; The active BWP on the carrier with the smallest index number; The active BWP on the carrier with an index number of zero; The active BWP with the lowest frequency; The active BWP on the pre-configured carrier; The active BWP configured for PDCCH and / or PUCCH transmission.

17. The method according to any one of claims 1 to 16, characterized in that It further includes: Transmitting the hybrid automatic repeat request acknowledgement character HARQ-ACK feedback corresponding to the PDSCH on all active BWPs on one of the at least two active BWPs; Wherein, the BWP for transmitting the HARQ-ACK feedback is fixed as the first active BWP, or pre-configured as one of the at least two active BWPs.

18. The method according to claim 17, wherein The HARQ-ACK information corresponding to the PDSCH on all active BWPs is included in the same codebook for feedback, and the order of the HARQ-ACK information in the codebook is determined according to at least one of the following methods: Arranging the corresponding HARQ-ACK information bits in the order of the index numbers of the active BWPs where the PDSCH is located; Arranging the corresponding HARQ-ACK information bits in the order of the index numbers of the carriers where the PDSCH is located; Arranging the corresponding HARQ-ACK information bits in the order of the frequency levels of the active BWPs where the PDSCH is located; Arranging the corresponding HARQ-ACK information bits in the order of the front and back of the starting symbol of the PDSCH.

19. The method according to any one of claims 1-18, characterized in that, The method further includes: Reporting at least one of the following capabilities to the base station: The capability to support BWP switching, wherein the BWP before switching and the BWP after switching are on different carriers; The capability to support BWP switching, wherein the BWP before switching and the BWP after switching are in different frequency bands; The capability to support transmission on at least two active BWPs, wherein the at least two BWPs are on different carriers; The capability to support transmission on at least two active BWPs, wherein the at least two BWPs are in different frequency bands.

20. A method performed by a base station in a communication system, characterized in that, It includes: Sending first signaling, and the first signaling includes information related to at least two active bandwidth parts BWPs, wherein the at least two active BWPs are respectively on different carriers, and the carriers where the at least two active BWPs are located are configured in the same serving cell; Performing uplink transmission or downlink transmission on the at least two active BWPs.

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