CN111093277A

CN111093277A - BWP switching method, apparatus and storage medium

Info

Publication number: CN111093277A
Application number: CN201911090406.2A
Authority: CN
Inventors: 梁春丽; 郝鹏; 魏兴光; 李剑; 李儒岳
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-05-01
Also published as: CN117042161A

Abstract

The application provides a BWP switching method, a device and a storage medium, the BWP switching method comprises the following steps: determining at least two kinds of BWPs of a secondary serving cell of a first communication node, wherein the at least two kinds of BWPs comprise a first BWP; and performing BWP handover on the secondary serving cell according to the received secondary serving cell dormancy indication, wherein the active BWP of the secondary serving cell of which the secondary serving cell dormancy indication is the first BWP.

Description

BWP switching method, apparatus and storage medium

Technical Field

The present application relates to wireless communication networks, and for example, to a BWP handover method, apparatus, and storage medium.

Background

A fifth Generation mobile communication (5th Generation, 5G) system supports a larger system bandwidth than a conventional mobile communication system. For example, the current 5G system supports a system bandwidth of 400MHz at maximum, but for a User Equipment (UE), if such a large system bandwidth is to be supported, not only the cost of the UE is increased, but also the power consumption of the UE is increased.

Therefore, a partial Bandwidth (Bandwidth Part) is introduced in the 5G system. BWP is a continuous bandwidth, and the UE does not need to support data transceiving within the entire system bandwidth, but only needs to support data transceiving within the bandwidth of BWP. In the 5G system, multiple uplink BWPs and multiple downlink BWPs may be configured in the whole system bandwidth, and at the same time, the UE may only have one activated uplink BWP and one activated downlink BWP, and the configuration on each BWP may be different, and the UE may dynamically adjust the activated BWP according to the service condition, thereby saving the power of the UE.

After the BWP mechanism is introduced, a Primary serving cell (PCell) and a Secondary serving cell (SCell) of the UE may use different BWPs, where the SCell may be in an inactive state, and then transition from the inactive state to an active state when needed. While the SCell may need to undergo a certain time delay (SCell activation delay) for switching from the inactive state to the active state. The SCell handover delay mainly includes an activation start-up delay and an activation processing delay, wherein the influence of the activation processing delay is the greatest. Therefore, how to determine the BWP handover mode of the SCell is an urgent problem to be solved at present.

Disclosure of Invention

The application provides a BWP handover method, device and storage medium, which are used for performing BWP handover of a secondary serving cell.

In a first aspect, an embodiment of the present application provides a BWP handover method, including:

determining at least two kinds of BWPs of a secondary serving cell of a first communication node, wherein the at least two kinds of BWPs comprise a first BWP;

and performing BWP handover on the secondary serving cell according to the received secondary serving cell dormancy indication, wherein the active BWP of the secondary serving cell of which the secondary serving cell dormancy indication is the first BWP.

In a second aspect, an embodiment of the present application provides a BWP switching method, including:

determining at least two BWPs of a secondary serving cell of the first communication node, the at least two BWPs including a first BWP,

and sending a secondary serving cell dormancy indication to the first communication node, wherein the secondary serving cell dormancy indication is used for enabling the first communication node to perform BWP switching on the secondary serving cell, and the active BWP of the secondary serving cell of which the secondary serving cell dormancy indication is the first BWP.

In a third aspect, an embodiment of the present application provides a user equipment, including: processor and memory, the processor being configured to execute program instructions stored in the memory to perform a BWP switching method according to the first aspect

In a fourth aspect, an embodiment of the present application provides a base station, including: comprising a processor and a memory, characterized in that the processor is adapted to execute program instructions stored in the memory for performing the BWP switching method according to the second aspect.

In a fifth aspect, an embodiment of the present application provides a storage medium storing a computer program, which when executed by a processor implements the BWP switching method according to the first aspect or the second aspect.

Drawings

Fig. 1 is a schematic diagram of Scell activation delay;

fig. 2 is a flowchart illustrating a BWP handover method according to an embodiment of the present invention;

fig. 3 is a schematic switching diagram of a BWP switching method according to an embodiment of the present application;

fig. 4 is a schematic switching diagram of another BWP switching method according to an embodiment of the present application;

fig. 5 is a schematic switching diagram of another BWP switching method according to an embodiment of the present application;

fig. 6 is a schematic switching diagram of another BWP switching method according to an embodiment of the present application;

fig. 7 is a flowchart of another BWP switching method according to an embodiment;

fig. 8 is a schematic diagram illustrating frame boundary alignment of the BWP switching method according to this embodiment;

fig. 9 is a schematic diagram illustrating frame boundary alignment of another BWP switching method according to this embodiment;

fig. 10 is a schematic diagram illustrating frame boundary alignment in another BWP switching method according to this embodiment;

fig. 11 is a schematic diagram illustrating frame boundary alignment in another BWP switching method according to this embodiment;

fig. 12 is a schematic structural diagram of a UE according to an embodiment;

fig. 13 is a schematic structural diagram of a base station according to an embodiment.

Detailed Description

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

In the current 5G system, each UE configures at most 4 uplink bwps (ul bwps) and 4 downlink bwps (dl bwps) on each carrier. At the same time, each UE can only have one active uplink BWP and one active downlink BWP. The configuration on each BWP may be different, and the UE may dynamically adjust to activate BWP according to traffic conditions. For example, the UE configures 2 downlink BWPs: BWP1 has a large bandwidth and BWP2 has a small bandwidth. When the downlink traffic volume of the UE is large, the UE may activate BWP1 for downlink traffic transmission; and when the downlink traffic of the UE is small, the UE may switch to BWP2 to save power.

There are three main ways to switch BWP:

1. downlink Control Information (DCI) is switched, and the UE determines a target uplink BWP and a target Downlink BWP to be switched according to a Downlink Control Information DCI format 0_1 for scheduling uplink data and a partial Bandwidth indicator (Bandwidth part indicator) in a Downlink Control Information DCI format1_1 for scheduling Downlink data.

2. Radio Resource Control (RRC) information switching, wherein the UE determines a target uplink BWP and a target downlink BWP to be switched according to a first activated uplink BWP identifier (first activeuplink BWP-Id) and a first activated downlink BWP identifier (first activedownlink BWP-Id) in the RRC information;

3. switching between BWP activation timing (BWP inactivity timer), when the BWP inactivity timer of the UE is overtime, switching the downlink BWP to a default downlink BWP by the UE, namely the downlink BWP corresponding to the defaultDownlinkBWP-Id in the configuration parameters of the serving cell.

For TDD systems, DL BWP and UL BWP are bundled to form a BWP Pair (BWP Pair) (BWP-index equals). The central frequency points of the uplink BWP and the downlink BWP of the same BWP pair are the same, but the bandwidth and the subcarrier interval can be different, so once the DL BWP is switched, the UL BWP is also switched; upon UL BWP handover, DL BWP is also handed over.

For the SCell of the UE, when the traffic is small and there is no need to continuously monitor the PDCCH, the BWP of the SCell may be switched to an inactive state, and then activated when it needs to be used. When the SCell is activated, there is a certain SCell activation delay (SCell activation delay), which mainly includes the following 2 parts:

activating starting time delay, namely n to n + k;

and (5) activating processing time delay, n + k-n + M.

If the UE receives an SCell activation command in slot (slot) n, the UE formally starts an SCell activation procedure in slot n + k and ends the SCell activation procedure in the slot where effective Channel State Information (CSI) is reported.

The above k means

k1 is used to indicate a slot where a Hybrid Automatic Repeat reQuest (HARQ) feedback (PUCCH) corresponding to a Physical Downlink Shared Channel (PDSCH) carrying an SCell activation command is located. The k value is calculated based on the Sub-Carrier Space (SCS) where the PUCCH is located. Wherein k1 may correspond to physical layer (L1) processing delay, 3ms->1ms, 3ms corresponds to Media Access Control (MAC) layer (L2) processing delay and RF warm-up delay, 4ms of LTE->3ms。

To ensure that the SCell is activated, the UE may not activate the SCell later than n + [ T ]_HARQ+T_{activation_time}+T_{CSI_Reporting}]Wherein THARQ means k1, T_{activation_time}Indicating MAC-CE analysis delay, RF_{warm up}Time delays, T, for AGC adjustment and time-frequency offset synchronization_{CSI_reporting}Representing the time delay of the UE for acquiring the CSI-RS and the time delay of the CSI-RS processingAnd obtaining the uncertainty time delay of the first CSI report resource. As shown in fig. 1, fig. 1 is a schematic diagram of Scell activation delay.

In current 5G systems, the minimum SCell activation latency is around 12ms, where the time for CSI acquisition is about 8 ms. Therefore, the SCell activation performance is improved, and the processing delay of the SCell is mainly reduced. Currently, a processing of a dormancy-like behavior (i.e., the UE does not turn off the RF on the SCell in this state is proposed, which is equivalent to reducing the activation processing delay, thereby greatly reducing the activation delay of the SCell. However, there is no specific method for how the SCell specifically performs BWP handover, and embodiments of the present application provide a method for SCell dormant state (dormant) and Normal state (Normal) handover on BWP.

Fig. 2 is a flowchart of a BWP switching method according to an embodiment, where as shown in fig. 2, the method according to this embodiment includes the following steps.

Step S1010, determining at least two BWPs of the secondary serving cell of the first communication node, where the at least two BWPs include the first BWP.

The BWP handover method provided in this embodiment is applied to a first communication node in a wireless communication system, where the first communication node is, for example, a UE. In addition, the wireless communication system further includes a second communication node, and the second communication node is, for example, a base station. A UE in a wireless communication system generally uses a battery as a power supply module, and since the battery has a limited power, it is necessary to give priority to the power saving problem of the UE. In a 5G communication system applying BWP, BWP of the SCell may be in a dormant state, and no PDCCH monitoring is performed or PDCCH monitoring is performed in a larger period. And when the UE needs to perform data transmission, the BWP in the dormant state can be switched to the BWP in the other normal state.

In order to implement BWP switching of the first communication node, in the present embodiment, at least two BWPs are defined, wherein the two BWPs include the first BWP. The first BWP is an active BWP of the first communication node in the dormant state, and the first BWP may be the BWP with the least power consumption among the BWPs configured for the first communication node, or the BWP configured specifically for the first communication node in the dormant state.

The first BWP comprises any one of the following BWPs;

the radio resource control RRC signaling is used for configuring a special BWP of the auxiliary service cell and is special for the dormant state;

configuring BWP which does not need PDCCH monitoring in BWP of a secondary serving cell;

the PDCCH configured in the BWP of the secondary serving cell monitors the BWP with the longest period;

a BWP with a longest transmission cycle of a Channel state information Reference Signal (CSI-RS) configured in the BWP of the secondary serving cell;

configuring a BWP with a minimum bandwidth in the BWPs of the secondary serving cell;

a default BWP of a secondary serving cell;

when the secondary serving cell is not configured with the dedicated dormant BWP, the default BWP of the secondary serving cell is the BWP corresponding to the configuration parameter defaultDownlinkBWP-Id of the secondary serving cell.

In one embodiment, the second communication node adds a BWP corresponding to the dormant state when configuring the parameters of the secondary serving cell, that is, adds a parameter of dormant downlink BWP-Id to the RRC configuration parameters, where the parameter points to a BWP-Id. In addition to the dormancoylink BWP-Id parameter, other parameters are shown. When this parameter is not configured (absent), the first communication node will use default BWP as the dormant BWP.

When the first BWP is any of the BWPs described above, the first communication node may be placed in a state of lower power consumption, thereby saving power consumption of the first communication node.

In an embodiment, the at least two BWPs further include a second BWP, where the second BWP is different from the first BWP, and the second BWP at least needs to monitor a physical downlink control channel PDCCH. Or the second BWP is the first active BWP (firstActiveDownlinkBWP-Id/firstactiveuplinkbpp-Id) of the secondary serving cell. The PDCCH to be monitored may be transmitted in the secondary serving cell (self-scheduling), or may be transmitted in other serving cells (cross-carrier scheduling).

In an embodiment, the at least two BWPs include a first BWP and a non-first BWP, wherein the non-first BWP is other BWPs except the first BWP.

Step S1020, performing BWP handover on the secondary serving cell according to the received secondary serving cell dormancy indication, where the activated BWP of the secondary serving cell for which the secondary serving cell dormancy indication is the first BWP.

After configuring at least two BWPs, the first communication node may perform BWP handover on the secondary serving cell according to the secondary serving cell dormancy indication sent by the second communication node. The secondary serving cell dormant indication may be carried in DCI sent by the second communication node, where the DCI is sent on the serving cell in the normal BWP, and the first communication node receives the DCI on the serving cell in the normal BWP and performs BWP handover according to the received dormant indication of the secondary serving cell. The secondary serving cell dormant indication may include a first indication, wherein the secondary serving cell dormant indication is the first indication indicating that the active BWP of the secondary serving cell is the first BWP. That is, if the dormant indication received by the first communication node corresponding to a certain secondary serving cell is the first indication, the activated BWP of the first communication node on the secondary serving cell should be the first BWP.

In an embodiment, if the at least two BWPs include a first BWP and a second BWP, the handover is performed to the first BWP when the indication of dormancy of the secondary serving cell is the first indication, and the handover is performed to the second BWP when the indication of dormancy of the secondary serving cell is the second indication. If the currently activated BWP of the first communication node is the first BWP, that is, the first communication node is in the dormant state, the BWP of the secondary serving cell of the first communication node is switched to the second BWP when the dormant indication of the secondary serving cell is the second indication, so that the first communication node can quickly switch to the normal BWP for subsequent data transmission.

In an embodiment, when the dormant indication of the secondary serving cell is the first indication and the active BWP of the current secondary serving cell is a BWP outside the first BWP, switching to the first BWP, otherwise not switching to the BWP; and switching to the second BWP when the dormant indication of the secondary serving cell is the second indication and the active BWP of the current secondary serving cell is the first BWP, and not switching the BWP otherwise. That is, when the currently activated BWP of the secondary serving cell is a BWP other than the first BWP, when the secondary serving cell dormant indication corresponding to the secondary serving cell is received as the second indication, the handover is not required, and when the received secondary serving cell dormant indication corresponding to the secondary serving cell is received as the first indication, the handover is performed to the first BWP. And when the currently activated BWP of the secondary serving cell is the first BWP, switching to the second BWP when the received secondary serving cell dormancy indication corresponding to the secondary serving cell is the second indication, and not switching when the received secondary serving cell dormancy indication corresponding to the secondary serving cell is the first indication.

In an embodiment, the secondary serving cell dormant indication comprises X bits, each bit for indicating BWP handover of one or a group of secondary serving cells. For example, 0 for each bit represents a first indication and 1 represents a second indication, or vice versa.

In an embodiment, if the at least two BWPs include the first BWP and the non-first BWP, switching to the target BWP when the dormant indication of the secondary serving cell is the second indication and when the active BWP of the current secondary serving cell is the first BWP, otherwise not switching the BWP; when the active BWP of the previous secondary serving cell is a BWP outside the first BWP, the BWP is not handed over. The non-first BWP is a BWP other than the first BWP.

Wherein the target BWP comprises any one of the following BWPs:

the first communication node is at a BWP before the secondary serving cell enters the first BWP;

a first communication node monitors a PDCCH (physical downlink control channel) monitoring period and/or a BWP with the shortest CSI-RS sending period in the BWPs configured on a secondary serving cell;

the first communication node is configured in the BWP with the largest bandwidth in the BWPs on the secondary serving cell;

a first active BWP of the first communication node on the serving cell;

BWP indicated by BWP index in the downlink control information.

In an embodiment, when the currently activated BWP of the secondary serving cell is the first BWP, when the secondary serving cell dormancy indication of the corresponding secondary serving cell is received as the second indication, the target BWP is handed over, and when the received secondary serving cell dormancy indication of the corresponding secondary serving cell is the first indication, the BWP handover is not performed. When the currently activated BWP of the secondary serving cell is a BWP other than the first BWP, the BWP handover is not performed.

The BWP handover method provided in this embodiment first determines at least two BWPs of the secondary serving cell of the first communication node, where the at least two BWPs include the first BWP, and then performs BWP handover on the secondary serving cell according to the received secondary serving cell dormancy indication, where the active BWP of the secondary serving cell indicated as the first dormant serving cell is the first BWP, so that the first communication node can perform BWP handover according to the secondary serving cell dormancy indication.

In an embodiment, the secondary serving cell dormant indication is included in downlink control information of scheduling data, where the downlink control information of the scheduling data includes the downlink control information of scheduling downlink data or the downlink control information of scheduling uplink data. That is, an extra bit is added to the downlink control information of the scheduling data for carrying the secondary serving cell dormant indication.

In an embodiment, the secondary serving cell dormant indication is included in the downlink control information of the non-scheduled data, and the downlink control information is divided into two types, namely downlink control information (DCI format 0_1) for scheduling uplink data and downlink control information (DCI format1_ 1) for scheduling downlink data, so that the first communication node needs to perform special configuration on the downlink control information of the non-scheduled data in order to correctly receive and analyze the downlink control information of the non-scheduled data.

In an embodiment, the secondary serving cell dormant indication is included in downlink control information for not scheduling data, and the length of the downlink control information for not scheduling data is the same as the length of the downlink control information for scheduling downlink data. That is, new downlink control information of non-scheduling data is configured for the secondary serving cell dormant indication, the downlink control information of the non-scheduling data is only used for transmitting the secondary serving cell dormant indication, and the length of the downlink control information of the non-scheduling data is the same as that of the downlink control information of the scheduling downlink data.

The downlink control information of the non-scheduling data and the downlink control information of the scheduling downlink data have different format zone bits, and the format zone bits are used for carrying the auxiliary service cell dormancy indication; or the downlink control information of the non-scheduling data is different from a preset value in a preset control domain of the downlink control information of the scheduling downlink data, and the preset control domain comprises at least one of the following: a Modulation and Coding Scheme (MCS), a New Data Indication (NDI), a Redundancy Version Indication (RV), a process number Indication (HPN), a Physical Uplink Control Channel (PUCCH) Resource Indication (PRI), a transmission power Control Indication (TPC), a time domain Resource allocation Indication (TDRA), and a frequency domain Resource allocation Indication (FDRA).

In an embodiment, when the value in the preset control field is the first preset value, it is indicated that the downlink control information is a DCI dedicated to carry the secondary serving cell dormancy indication, and is not used for scheduling downlink data.

In an embodiment, the downlink control information that is not used for scheduling data and includes the secondary serving cell dormancy indication includes a control field of the secondary serving cell dormancy indication, where the control field of the secondary serving cell dormancy indication is formed by other control fields except a preset control field existing in the downlink control information for scheduling downlink data, and the size of the control field is X bits, and X preferably takes a value of 15.

In an embodiment, the downlink control information that includes the secondary serving cell dormancy indication and is not used for scheduling data only includes a format flag bit and an X-bit secondary serving cell dormancy indication control field, and the remaining bits are padding bits (padding bits) whose size is guaranteed to be the same as that of the dci format1_ 1.

In an embodiment, the secondary serving cell dormant indication is included in downlink control information for not scheduling data, and the length of the downlink control information for not scheduling data is the same as the length of the downlink control information for scheduling uplink data. That is, new downlink control information of non-scheduling data is configured for the secondary serving cell dormant indication, the downlink control information of the non-scheduling data is only used for transmitting the secondary serving cell dormant indication, and the length of the downlink control information of the non-scheduling data is the same as that of the downlink control information of the scheduling uplink data. The downlink control information of the non-scheduling data is different from a preset value in a preset control domain of the downlink control information of the scheduling uplink data, and the preset control domain comprises at least one of the following: an uplink shared channel indication domain UL-SCH, and a channel state information request indication domain CSI-Req first communication node st.

In an embodiment, the value of the predetermined control field is a first predetermined value, the preferred UL-SCH is 0, and the CSI-Req first communication node st is 0.

In an embodiment, the downlink control information that is not used for scheduling data and includes the secondary serving cell dormancy indication includes a control field of the secondary serving cell dormancy indication, where the control field of the secondary serving cell dormancy indication is formed by other control fields except a preset control field existing in the downlink control information for scheduling uplink data, and the size of the control field is X bits, and X preferably takes a value of 15.

In an embodiment, the downlink control information that includes the secondary serving cell dormancy indication and is not used for scheduling data only includes a preset control field and an X-bit secondary serving cell dormancy indication control field, and the remaining bits are padding bits (padding bits) whose size is guaranteed to be the same as that of the DCIformat 0_ 1.

In an embodiment, the downlink control information carrying the dormant indication of the secondary serving cell is only sent on the allowed primary serving cell; or allowed to transmit on the primary serving cell and the secondary serving cell.

In an embodiment, when the secondary serving cell dormant indication is included in the downlink control information of the scheduling data, the control domain corresponding to the secondary serving cell dormant indication is a control domain newly added to the downlink control information, and the bit number of the control domain corresponding to the secondary serving cell dormant indication is determined according to the configured number of secondary serving cells/cell groups. And the mapping relation of the bits corresponding to the auxiliary service cell/cell group and the auxiliary service cell dormancy indication is configured by a high layer.

In an embodiment, performing BWP handover on a secondary serving cell according to a received secondary serving cell dormancy indication includes: and when the auxiliary serving cell dormancy indication is contained in the downlink control information of the scheduling data, performing BWP switching on the auxiliary serving cell according to the auxiliary serving cell dormancy indication, and ignoring the auxiliary serving cell dormancy indication in the downlink control information.

There are three cases, respectively:

1. when the scell dormant indication is included in the downlink control information of the scheduled data, and the downlink control information schedules a scell for data transmission at BWP1 (not the first BWP, indicated by the BWP index control field) while the scell/cell group corresponding to the scell dormant indication control field in the downlink control information includes the scell, the first communication node receives data according to the BWP indicated by the BWP index control field, and disregards the indication of the scell dormant indication. As shown in fig. 3, fig. 3 is a schematic switching diagram of a BWP switching method according to an embodiment of the present application, where in a control domain for scheduling downlink data transmission, a CIF is indicated as SCell1, and a BWP indicated by a BWP index control domain is BWP1, then an indication in a SCell dormant indication is ignored.

2. When the secondary serving cell dormant indication is included in the downlink control information of the scheduled data, and the downlink control information schedules a secondary serving cell to perform data transmission at the first BWP (indicated by the BWP index control field) and the secondary serving cell/cell group corresponding to the secondary serving cell dormant indication control field in the downlink control information includes the secondary serving cell, the first communication node performs data reception according to the BWP indicated by the BWP index control field, but disregards the indication of the secondary serving cell dormant indication. As shown in fig. 4, fig. 4 is a schematic switching diagram of another BWP switching method provided in this embodiment of the present application, where in a control domain for scheduling downlink data transmission, a CIF is indicated as SCell1, and a BWP indicated by a BWP index control domain is a first BWP, an indication in an SCell dormant indication is ignored.

3. When the first communication node receives downlink control information DCI-1 which contains a secondary serving cell dormancy indication and is used for indicating a PCell to perform data transmission and downlink control information DCI-2 which schedules a secondary serving cell SCell1 to perform data transmission, and a secondary serving cell/cell group corresponding to a secondary serving cell dormancy indication control domain in the DCI-1 contains a secondary serving cell SCell1, the first communication node performs data reception according to BWP indicated by a BWP index control domain, and ignores the indication of the secondary serving cell dormancy indication. (BWP index control field has higher priority than the secondary serving cell dormancy indication control field). As shown in fig. 5, fig. 5 is a schematic switching diagram of another BWP switching method provided in this embodiment of the present application, where DCI-1 is downlink control information for scheduling PCell, DCI-2 is downlink control information for scheduling SCell downlink transmission, and BWP indicated by BWP index control field in DCI-2 is first BWP, then the indication in the SCell dormant indication in DCI-1 is ignored.

That is, when the downlink control information of the scheduling data received by the first communication node includes the scell dormant indication and the BWP indicated in the control field for scheduling data transmission does not match the BWP indicated in the scell dormant indication, the first communication node will take the BWP indicated in the control field for scheduling data transmission as the criterion, regardless of whether the control field for scheduling transmission and the scell dormant indication control field are in the same DCI.

In an embodiment, when each bit of the secondary serving cell dormant indication corresponds to 1 secondary serving cell, the first communication node does not expect the BWP indicated by the secondary serving cell dormant indication to be inconsistent with the BWP indicated in the control field in which the data transmission is scheduled.

In the above embodiment, when the secondary serving cell dormant indication is included in the downlink control information of the scheduled data, and the scheduled data is limited to the primary serving cell only, if it is to be guaranteed that the downlink control information for scheduling the secondary serving cell for data transmission is the same size as the downlink control information for scheduling the primary serving cell for data transmission, assuming that both DCI are transmitted on the primary serving cell, when the value corresponding to the CIF control field of the DCI is 0 (indicating that the DCI schedules the primary serving cell), the secondary serving cell dormant indication control field indicates BWP handover of the secondary serving cell/cell group, and when the value corresponding to the CIF control field of the DCI is greater than 0 (indicating that the DCI schedules the secondary serving cell), the bit corresponding to the secondary serving cell dormancy indication control field is an add bit (padding bit), and is not used for indicating the switching of the secondary serving cell/cell group.

In an embodiment, the secondary serving cell/cell group to be BWP handed over, which is indicated by the secondary serving cell dormancy indication field in the downlink control information, is handed over to the BWP indicated by the BWP index control field in the downlink control information.

As shown in fig. 6, fig. 6 is a switching diagram of another BWP switching method provided in this embodiment of the present application, where in a downlink control information including scheduling data of a secondary serving cell dormancy indication, a secondary serving cell dormancy indication control field includes 4 bits, and corresponds to 4 higher-layer configured secondary serving cell groups, respectively, where it is assumed that an SCell Group1 includes an SCell1 and an SCell2, and an SCell Group2 includes an SCell3 and an SCell4, and the terminal may have the following explanations for this control field of the BWP index: (1) indicating the BWP where the downlink transmission is located; (2) indicating an index of a target BWP to which a secondary serving cell to be subjected to BWP handover is to be handed over in the SCell dormancy indication control domain; (3) the above (1) and (2) are indicated at the same time.

Assuming the explanation according to (2) above, the DCI shown in fig. 6 will indicate that secondary serving cells SCell1, SCell2, SCell3, and SCell4 are all handed over to BWP 1. One premise assumed here is that SCell1, SCell2, SCell3, and SCell4 are all in the first BWP, and if these serving cells are in non-BWP, then BWP handover is not needed.

Fig. 7 is a flowchart of another BWP switching method according to an embodiment of the present invention, where as shown in fig. 7, the method according to the present embodiment includes the following steps.

Step S7010, at least two BWPs of the secondary serving cell of the first communication node are determined, where the at least two BWPs include the first BWP.

The BWP handover method provided by the present embodiment is applied to the second communication node in the wireless communication system. The first communication node performs BWP handover in the wireless communication system according to the indication information transmitted by the second communication node.

The first BWP comprises any one of the following BWPs;

a default BWP of a secondary serving cell;

Step S7020 is to send an auxiliary serving cell dormant indicator to the first communication node, where the auxiliary serving cell dormant indicator is used to enable the first communication node to perform BWP handover on the auxiliary serving cell, and the activated BWP of the auxiliary serving cell for which the auxiliary serving cell dormant indicator is the first BWP.

After configuring at least two BWPs, the second communication node may send the secondary serving cell dormant indication to the first communication node, so that the first communication node performs BWP handover on the secondary serving cell according to the secondary serving cell dormant indication. The secondary serving cell dormant indication may be carried in DCI sent by the second communication node, where the DCI is sent on the serving cell in the normal BWP, and the first communication node receives the DCI on the serving cell in the normal BWP and performs BWP handover according to the received dormant indication of the secondary serving cell. The secondary serving cell dormant indication may include a first indication, wherein the secondary serving cell dormant indication is the first indication indicating that the active BWP of the secondary serving cell is the first BWP. That is, if the dormant indication received by the first communication node corresponding to a certain secondary serving cell is the first indication, the activated BWP of the first communication node on the secondary serving cell should be the first BWP.

In a carrier aggregation scenario, a Primary serving Cell (PCell) and a secondary serving Cell (SCell) require frame boundary alignment. Under the condition that the frame boundaries are aligned, NR determines the slot where the PDSCH scheduled by PDCCH is located according to the following formula,

where n denotes a slot index, μ, at which the first communication node receives the PDCCH_PDSCHAnd mu_PDCCHDenotes Numerology corresponding to PDSCH and PDCCH, respectively. K₀Is an offset between PDCCH and PDSCH indicated in DCI, and K₀Is calculated based on the Numerology of the PDSCH.

Similarly, under the condition of frame boundary alignment, NR determines the slot where PUSCH scheduled by PDCCH is located according to the following formula,

where n denotes a slot index, μ, at which the first communication node receives the PDCCH_PUSCHAnd mu_PDCCHThe Numerology corresponding to the PUSCH and PDCCH are respectively indicated. K₂Is an offset between PDCCH and PUSCH indicated in DCI, and K₂Is calculated based on the Numerology of PUSCH.

Taking the scheduling of PDSCH as an example, as shown in fig. 8, fig. 8 is a schematic diagram of frame boundary alignment of the BWP handover method provided in this embodiment. Suppose PDCCH is above slot 2, i.e. n is 2, μ_PDSCH＝0，μ_PDCCHK indicated in DCI ═ 2₀If 1, the slot index of the PDSCH is calculated according to the formula as

As shown in fig. 7.

Currently in a CA scenario, the frame boundaries of PCell and SCell may not be aligned, i.e., there may be an integer number of slot offsets between PCell and SCell. The network informs the first communication node of a frame offset between each SCell and the PCell, and the unit of the offset is determined according to all uplink and downlink BWP numerologies configured on the SCell and the PCell. Assume all M (M) s configured on the PCell>0 and M<M is an integer) is mu_{DL BWP,P1},μ_DL _BWP,P2,……,μ_DL _BWP,PW,

All N (N) configured on PCell>0 and N<N is an integer) is mu_{UL BWP,P1},μ_{UL BWP,P2},……,μ_{UL BWP,PN}，

Similarly, it is assumed that Numerology corresponding to all X (X >0 and X < ═ 4, X is an integer) downlink BWPs configured on the SCell is

μ_{DL BWP,S1,}μ_{DL BWP,S2},……,μ_{DL BWP,SX},

Numeriology corresponding to all Y uplink BWPs configured on SCell is

μ_UL _BWP,S1,μ_UL _BWP,S2,……,μ_UL _BWP,SY,

The unit of frame offset count of the SCell and the PCell is

[ equation 1]

Under the condition that the frame boundaries of the PCell and the SCell are not aligned, the above formula for determining the PDSCH scheduled by the PDCCH or the slot where the PUSCH is located cannot work, and the updated formula needs to consider the frame offset μ between the SCell and the PCell_SCell,ref。

Example 1

The frame offset is assumed as follows:

if the SCell is aligned with the frame boundary of the PCell, the frame offset is 0;

if the starting point of the frame 0 of the SCell is later than the starting point of the frame Pcell 0, the frame offset is greater than 0;

if the start of frame 0 of SCell is earlier than the start of frame 0 of PCell, the frame offset is less than 0.

As shown in fig. 9 and 10, fig. 9 is a schematic diagram of frame boundary alignment of another BWP switching method provided in this embodiment, and fig. 10 is a schematic diagram of frame boundary alignment of another BWP switching method provided in this embodiment.

Suppose that PDCCH corresponds to Numerology mu_PDCCHPDSCH corresponds to Numerology μ_PDSCHThe frame offset between the Cell and the PCell in which the PDCCH is located is O_PDCCHAnd O is_PDCCHIn μ_PDCCH,refCounting for a unit, and the frame offset between the Cell and the PCell where the PDSCH is located is O_PDSCHAnd O is_PDSCHIn μ_PDSCH,refCounting for a unit, the first communication node receives the PDCCH on a slot index n, and the slot offset between the PDCCH and the PDSCH indicated in the DCI is K₀Then, the slot index where the scheduled PDSCH is located is determined according to the following formula:

wherein, mu_PDCCH,refFor the frame offset between the PCell and the Cell where the PDCCH is located, according to [ equation 1]]Calculating to obtain; mu.s_PDSCH,refFor the frame offset between the PCell and the Cell where the PDSCH is located, according to [ equation 1]]And (4) calculating.

Similarly, suppose the Numerology corresponding to PDCCH is μ_PDCCHPUSCH corresponds to Numerology mu_PUSCHThe frame offset between the Cell and the PCell in which the PDCCH is located is O_PDCCHAnd O is_PCCHIn μ_PDCCH,refCounting by unit, and the frame offset between the Cell and the PCell where the PUSCH is positioned is O_PUSCHAnd O is_PUSCHIn μ_PUSCH,refCounting for a unit, the first communication node receives the PDCCH on a slot index n, and the slot offset between the PDCCH and the PUSCH indicated in the DCI is K₂If the slot index of the scheduled PUSCH is determined according to the following formula:

wherein, mu_PDCCH,refFor the frame offset between the PCell and the Cell where the PDCCH is located, according to [ equation 1]]Calculating to obtain; mu.s_PUSCH,refFor the frame offset between the Cell and the PCell where the PUSCH is located, according to [ equation 1]]And (4) calculating.

Taking fig. 11 as an example, fig. 11 is a schematic diagram of frame boundary alignment of another BWP switching method provided in this embodiment, assuming that

PDCCH corresponds to Numerology mu _PDCCH2, the frame offset between the Cell and the PCell where the PDCCH is located is O _PDCCH2 and O_PDCCHIn μ_PDCCH,refCounting in units of 2, namely, the starting point of the frame 0 of the Cell where the PDCCH is located is 2 mu 2 slots later than the starting point of the frame 0 of the PCell;

PDSCH corresponding to Numerology μ _PDSCH0, the frame offset between the Cell and the PCell where the PDSCH is located is O _PDSCH2 and O_PDSCHIn μ_PDSCH,refCounting in units of 1, that is, the starting point of frame 0 of Cell in which PDSCH is located is more than frame 0 of PCellThe frame starting point is 2 mu-1 slot length later;

the slot index where the PDCCH is located is n, and n is 2;

indicating K in DCI₀＝1，

Then the slot index where the PDSCH is located is 1 according to the following formula.

Example 2

The frame offset is assumed as follows:

if the starting point of the frame 0 of the SCell is later than the starting point of the frame Pcell 0, the frame offset is less than 0;

if the start of frame 0 of SCell is earlier than the start of frame 0 of PCell, the frame offset is greater than 0.

Similarly, suppose the Numerology corresponding to PDCCH is μ_PDCCHPUSCH corresponds to Numerology mu_PUSCHPDCCH stationFrame offset between Cell and PCell of O_PDCCHAnd O is_PCCHIn μ_PDCCH,refCounting by unit, and the frame offset between the Cell and the PCell where the PUSCH is positioned is O_PUSCHAnd O is_PUSCHIn μ_PUSCH,refCounting for a unit, the first communication node receives the PDCCH on a slot index n, and the slot offset between the PDCCH and the PUSCH indicated in the DCI is K₂If the slot index of the scheduled PUSCH is determined according to the following formula:

Example 3

The newly introduced parameter q is used to indicate the direction of the offset between SCell and PCell. The protocol or system will default to one of the following specifications.

If the system is specified as follows, q is 1;

when the starting point of the frame No. 0 of the SCell is later than the starting point of the frame No. 0 of the Pcell, the frame offset is greater than 0;

when the start of the frame No. 0 of the SCell is earlier than the start of the frame No. 0 of the Pcell, the frame offset is less than 0;

when the start of SCell frame No. 0 aligns with the start of Pcell frame No. 0, the frame offset equals 0.

If the system is specified as follows, q is-1;

when the starting point of the frame No. 0 of the SCell is later than the starting point of the frame No. 0 of the Pcell, the frame offset is less than 0;

when the start of the SCell frame No. 0 is earlier than the start of the Pcell frame No. 0, the frame offset is greater than 0;

Suppose that PDCCH corresponds to Numerology mu_PDCCHPDSCH corresponds to Numerology μ_PDSCH，PThe frame offset between the Cell and the PCell of the DCCH is O_PDCCHAnd O is_PDCCHIn μ_PDCCH,refCounting for a unit, and the frame offset between the Cell and the PCell where the PDSCH is located is O_PDSCHAnd O is_PDSCHIn μ_PDSCH,refCounting for a unit, the first communication node receives the PDCCH on a slot index n, and the slot offset between the PDCCH and the PDSCH indicated in the DCI is K₀Then, the slot index where the scheduled PDSCH is located is determined according to the following formula:

Example 4

The frame offset is assumed as follows:

Example 5

The frame offset is assumed as follows:

Suppose that PDCCH corresponds to Numerology mu_PDCCHPDSCH corresponds to Numerology μ_PDSCHThe frame offset between the Cell and the PCell in which the PDCCH is located is O_PDCCHAnd O is_PDCCHIn μ_PDCCH，refCounting for a unit, and the frame offset between the Cell and the PCell where the PDSCH is located is O_PDSCHAnd O is_PDSCHIn μ_PDSCH,refCounting for a unit, the first communication node receives the PDCCH on a slot index n, and the slot offset between the PDCCH and the PDSCH indicated in the DCI is K₀Then, the slot index where the scheduled PDSCH is located is determined according to the following formula:

Example 6

If the system is specified as follows, q is 1;

If the system is specified as follows, q is-1;

Fig. 12 is a schematic structural diagram of a UE according to an embodiment, as shown in fig. 12, the UE includes a processor 121, a memory 122, a transmitter 123, and a receiver 124; the number of the processors 121 in the UE may be one or more, and one processor 121 is taken as an example in fig. 12; a processor 121 and memory 122 in the UE; the connection may be via a bus or other means, such as via a bus as illustrated in FIG. 12.

The memory 122, which is a computer-readable storage medium, may be configured to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the BWP switching method in the embodiment of fig. 2. The processor 121 implements the BWP handover method by executing the software programs, instructions and modules stored in the memory 122, thereby implementing at least one functional application and data processing of the UE.

The memory 122 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the UE, and the like. Further, the memory 122 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.

The transmitter 123 is a module or a combination of devices capable of transmitting radio frequency signals into space, including, for example, a radio frequency transmitter, an antenna, and other devices. The receiver 124 is a module or a combination of devices capable of receiving radio frequency signals from the space, including, for example, a radio frequency receiver, an antenna, and other devices.

Fig. 13 is a schematic structural diagram of a base station according to an embodiment, as shown in fig. 13, the base station includes a processor 131, a memory 132, a transmitter 133, and a receiver 134; the number of the processors 131 in the base station may be one or more, and one processor 131 is taken as an example in fig. 13; a processor 131 and a memory 132 in the base station; the connection may be via a bus or other means, such as via a bus as illustrated in FIG. 13.

The memory 132, which is a computer-readable storage medium, may be configured to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the BWP switching method in the embodiment of fig. 7 in the present application. The processor 131 implements the BWP handover method by executing software programs, instructions and modules stored in the memory 132 to perform at least one of the functions of the base station, application and data processing.

The memory 132 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the base station, and the like. Further, the memory 132 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.

The transmitter 133 is a module or combination of devices capable of transmitting radio frequency signals into space, including, for example, a radio frequency transmitter, an antenna, and other devices. The receiver 134 is a module or combination of devices capable of receiving radio frequency signals from space, including, for example, a radio frequency receiver, an antenna, and other devices.

Embodiments of the present application also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a BWP switching method, the method including: determining at least two kinds of BWPs of a secondary serving cell of a first communication node, wherein the at least two kinds of BWPs comprise a first BWP; and performing BWP handover on the secondary serving cell according to the received secondary serving cell dormancy indication, wherein the active BWP of the secondary serving cell of which the secondary serving cell dormancy indication is the first BWP.

Embodiments of the present application also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a BWP switching method, the method including: determining at least two kinds of BWPs of a secondary serving cell of the first communication node, wherein the at least two kinds of BWPs comprise the first BWP, and sending a secondary serving cell dormancy indication to the first communication node, wherein the secondary serving cell dormancy indication is used for enabling the first communication node to perform BWP handover on the secondary serving cell, and the active BWP of the secondary serving cell indicated as the first indication is the first BWP.

The above are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application.

It will be clear to a person skilled in the art that the term user terminal covers any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser or a car mounted mobile station.

In general, the various embodiments of the application may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the application is not limited thereto.

Embodiments of the application may be implemented by a data processor of a mobile device executing computer program instructions, for example in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions may be assembly instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages.

Any logic flow block diagrams in the figures of this application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored on a memory. The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, Read-Only Memory (ROM), Random-Access Memory (RAM), optical storage devices and systems (Digital versatile disks (DVD) or Compact Disks (CD)), etc., the computer-readable medium can comprise a non-transitory storage medium, the data processor can be of any type suitable to the local technical environment, such as, but not limited to, general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Programmable logic devices (FGPAs), and processors based on a multi-core processor architecture.

Claims

1. A BWP switching method, comprising:

determining at least two kinds of partial bandwidth BWPs of a secondary serving cell of a first communication node, the at least two kinds of BWPs including a first BWP;

2. The method according to claim 1, wherein the first BWP comprises any one of the following;

the radio resource control RRC signals a special BWP configured by the secondary serving cell;

a BWP with the longest sending period of a channel state information reference signal CSI-RS configured in the BWP of a secondary serving cell;

a default BWP of a secondary serving cell;

when the secondary serving cell is not configured with a proprietary BWP, it is the default BWP of the secondary serving cell.

3. The method of claim 2, wherein the at least two BWPs further comprise a second BWP, and wherein the second BWP is different from the first BWP, and wherein the second BWP requires at least monitoring of a physical downlink control channel PDCCH.

4. The method of claim 3, wherein the second BWP is a first active BWP of the first communication node.

5. The method of claim 3, wherein the PDCCH to be monitored is a PDCCH transmitted by a serving cell of the cell, or the PDCCH to be monitored is a PDCCH transmitted by another serving cell.

6. The method of claim 3, wherein performing BWP handover for the secondary serving cell based on the received secondary serving cell dormancy indication comprises:

and switching to a first BWP when the dormancy indication of the secondary serving cell is a first indication, and switching to a second BWP when the dormancy indication of the secondary serving cell is a second indication.

7. The method of claim 3, wherein performing BWP handover for the secondary serving cell based on the received secondary serving cell dormancy indication comprises:

when the dormancy indication of the secondary serving cell is a first indication and the active BWP of the current secondary serving cell is a BWP outside the first BWP, switching to the first BWP, otherwise, not switching to the BWP;

and when the dormancy indication of the secondary serving cell is a second indication and the active BWP of the current secondary serving cell is the first BWP, switching to a second BWP, and otherwise, not switching the BWP.

8. The method of claim 2, wherein performing BWP handover on the secondary serving cell according to the received secondary serving cell dormant indication comprises:

when the dormancy indication of the secondary serving cell is a second indication and when the active BWP of the current secondary serving cell is a first BWP, switching to a target BWP, otherwise, not switching to the BWP;

when the active BWP of the current secondary serving cell is a BWP outside the first BWP, not switching the BWP;

the target BWP comprises any one of the following BWPs:

the first communication node is in a first BWP before the secondary serving cell enters the BWP;

the first communication node monitors BWP with the shortest PDCCH monitoring period and/or CSI-RS sending period in BWP configured on a secondary serving cell;

the first communication node is configured to determine a bandwidth of a BWP configured on the secondary serving cell;

a first active BWP on the serving cell for the first communication node;

BWP indicated by BWP index in the downlink control information.

9. The method of any of claims 1 to 8, wherein the secondary serving cell dormant indication comprises X bits, each bit for indicating BWP handover of one or a group of secondary serving cells.

10. The method according to any of claims 1 to 8, wherein the secondary serving cell dormant indication is included in downlink control information of scheduling data, and the downlink control information of the scheduling data comprises the downlink control information of scheduling downlink data or the downlink control information of scheduling uplink data.

11. The method of claim 10, wherein the secondary serving cell dormant indication is included in downlink control information of non-scheduled data, and wherein the downlink control information of non-scheduled data is the same as the downlink control information of scheduled downlink data in length;

the downlink control information of the non-scheduling data and the downlink control information of the scheduling downlink data have different format zone bits; or the downlink control information of the non-scheduling data is different from a preset value in a preset control domain of the downlink control information of the scheduling downlink data, and the preset control domain includes at least one of the following: the method comprises a coding modulation scheme indication domain MCS, a new data indication domain NDI, a redundancy version indication domain RV, a process number indication domain HPN, a physical uplink control channel PUCCH resource indication domain PRI, a transmission power control indication domain TPC, a time domain resource allocation indication domain TDRA and a frequency domain resource allocation indication domain FDRA.

12. The method of claim 11, wherein the secondary serving cell dormant indication in the downlink control information without scheduling data is formed by a control field other than a preset control field of the downlink control information with scheduling downlink data.

13. The method of claim 11, wherein the downlink control information for non-scheduled data has the same length as the downlink control information for scheduled downlink data by adding bits.

14. The method of claim 10, wherein the downlink control information for non-scheduled data has a same length as the downlink control information for scheduled uplink data, and the downlink control information for non-scheduled data is different from a preset value in a preset control field of the downlink control information for scheduled uplink data, and the preset control field comprises at least one of: an uplink shared channel indication domain UL-SCH, and a channel state information request indication domain CSI-Req first communication node st.

15. The method of claim 14, wherein the secondary serving cell dormant indication in the downlink control information without scheduling data is formed by a control field other than a preset control field for scheduling downlink control information with uplink data.

16. The method of claim 14, wherein the downlink control information for not scheduling data has the same length as the downlink control information for scheduling uplink data by adding bits.

17. The method according to any of claims 1 to 8, wherein the performing BWP handover on the secondary serving cell according to the received secondary serving cell dormant indication comprises:

and when the auxiliary service cell dormancy indication is contained in the downlink control information of the scheduling data, performing BWP switching on the auxiliary service cell according to the auxiliary service cell dormancy indication, and ignoring the auxiliary service cell dormancy indication in the downlink control information.

18. A BWP switching method, comprising:

determining at least two partial bandwidths, BWPs, of a secondary serving cell of the first communication node, the at least two BWPs comprising a first BWP,

sending a secondary serving cell dormancy indication to the first communication node, where the secondary serving cell dormancy indication is used for enabling the first communication node to perform BWP handover on a secondary serving cell, and an active BWP of the secondary serving cell of which the secondary serving cell dormancy indication is the first BWP.

19. The method according to claim 18, wherein the first BWP comprises any one of the following;

a default BWP of a secondary serving cell;

20. The method of claim 19, wherein the at least two BWPs further comprise a second BWP, and wherein the second BWP is different from the first BWP, and wherein the second BWP requires at least monitoring of a physical downlink control channel PDCCH.

21. The method of claim 20, wherein the second BWP is the first active BWP of the first communication node.

22. The method of claim 20, wherein the PDCCH needing to be monitored is a PDCCH sent by a secondary serving cell, or wherein the PDCCH needing to be monitored is a PDCCH sent by another serving cell.

23. The method of any of claims 18 to 22, wherein the secondary serving cell dormant indication comprises X bits, each bit for indicating BWP handover of one or a group of secondary serving cells.

24. The method according to any of claims 18 to 22, wherein the secondary serving cell dormant indication is included in downlink control information of scheduling data, and the downlink control information of the scheduling data comprises downlink control information of scheduling downlink data or downlink control information of scheduling uplink data.

25. The method of claim 24, wherein the secondary serving cell dormant indication is included in downlink control information of non-scheduled data, and wherein the downlink control information of non-scheduled data is the same as the downlink control information of scheduled downlink data in length;

26. The method of claim 25, wherein the secondary serving cell dormant indication in the downlink control information without scheduling data is formed by a control field other than a preset control field for scheduling downlink control information with downlink data.

27. The method of claim 25, wherein the downlink control information for non-scheduled data has the same length as the downlink control information for scheduled downlink data by adding bits.

28. The method of claim 24, wherein the downlink control information for non-scheduled data has a same length as the downlink control information for scheduled uplink data, and the downlink control information for non-scheduled data is different from a preset value in a preset control field of the downlink control information for scheduled uplink data, and the preset control field comprises at least one of: an uplink shared channel indication domain UL-SCH, and a channel state information request indication domain CSI-Req first communication node st.

29. The method of claim 28, wherein the secondary serving cell dormant indication in the downlink control information without scheduling data is formed by a control field other than a preset control field for scheduling downlink control information with downlink data.

30. The method of claim 28, wherein the downlink control information for non-scheduled data has the same length as the downlink control information for scheduled downlink data by adding bits.

31. A user equipment, comprising: processor and memory, characterized in that the processor is configured to execute program instructions stored in the memory to perform the BWP switching method according to any one of claims 1-17.

32. A base station, comprising: comprising a processor and a memory, wherein the processor is configured to execute program instructions stored in the memory to perform the BWP switching method according to any one of claims 18-30.

33. A storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the BWP switching method according to any one of claims 1-30.