WO2024207374A1 - Data receiving method and apparatus, and data sending method and apparatus - Google Patents

Abstract

Provided in the embodiments of the present application are a data receiving method and apparatus, and a data sending method and apparatus. The data receiving method comprises: a terminal device receiving first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell; and when a first CORESET of the first target cell is not configured with a first TCI state pool, or when the first CORESET is configured with the first TCI state pool but a TCI state in the first TCI state pool is not activated, according to a first QCL assumption, receiving a PDCCH or not receiving the PDCCH.

Description

Data receiving and data sending method and device Technical Field

The embodiments of the present application relate to the field of communication technologies.

Background Art

During the standardization process of Release 17 (Rel-17), the 3GPP standardization organization has carried out standardization work on the unified transmission configuration indication (TCI). Among them, the unified TCI in Rel-17 is mainly designed for the single transmission and reception point (sTRP) scenario.

It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology part of the present application.

Summary of the invention

Rel-17 standardizes unified TCI (transmission configuration indication). Rel-17 unified TCI is for sTRP scenarios, where the transmission configuration indication (TCI) field of downlink control information (DCI) format 1_1 or DCI format 1_2 indicates one or more TCI states. DCI format 1_1 or DCI format 1_2 can schedule downlink data, called DCI format 1_1/1_2 with DL assignment, or can not schedule downlink data, called DCI format 1_1/1_2 without DL assignment. The indication or update of the TCI state actually also includes the indication or update of the beam used by the terminal device. The TCI state includes the joint TCI state, the downlink TCI state (DL TCI state) and the uplink TCI state (UL TCI state). The joint TCI state acts on both the downlink and uplink, that is, there is reciprocity between the uplink and downlink beams or QCL. The downlink TCI state only acts on the downlink. The uplink TCI state only applies to the uplink. The uplink beam is also called the uplink transmit spatial filter. For the unified TCI of Rel-17, a TCI field indicates a joint TCI state, or a downlink TCI state, or an uplink TCI state, or a downlink TCI state and an uplink TCI state. Assuming that the DCI indicates the TCI state, the TCI state begins to be applied after the beam application time. The channels or signals applied by the TCI state include dedicated channels or signals for the terminal device, as well as some common channels or signals. For example, the Physical Downlink Shared Channel (PDSCH), the Physical Uplink Shared Channel (PDSCH), and the Physical Uplink Shared Channel (PDSCH). Shared Channel (PUSCH) and Physical Uplink Control Channel (PUCCH) follow the unified TCI state; some control resource sets (CORESETs) follow the unified TCI state; some CORESETs can be configured to follow the unified TCI state. In order to avoid confusion, TCI state is used to describe a certain transmission direction (downlink or uplink). For downlink transmission, TCI state refers to downlink or joint TCI state; for uplink transmission, TCI state refers to uplink or joint TCI state.

Rel-18 will study Layer 1/Layer 2 Triggered Mobility (LTM). For Rel-18 LTM, the goal is to reduce the time required for handover interruption through cell switching based on Layer 1/Layer 2 signaling (Layer 1/Layer 2 triggered), thereby switching from the serving cell to the target cell faster. The target cell is the cell after switching, which can be a serving cell or a non-serving cell. The handover interruption refers to the time from the terminal device receiving the cell switching command to the first successful uplink or downlink communication between the terminal device and the target cell. Rel-18 LTM is based on the Rel-17 unified TCI framework. Different from the cell switching based on L3 signaling, in the cell switching based on L1/L2 signaling (L1/L2 Triggered Mobility, LTM), the terminal equipment can complete the measurement, reporting, downlink synchronization and uplink synchronization of the candidate cells (including the target cell) before the cell switch command (cell switch command), so that the uplink or downlink transmission with the target cell can be completed faster after receiving the cell switch command, thereby reducing the interruption time.

The inventors found that: the cell switch command at least indicates the target cell and the TCI state applied on the target cell. The indicated TCI state is applied as the unified TCI state. After the cell switch, in order to successfully complete the uplink or downlink transmission with the target cell as soon as possible (i.e., in order to reduce the interruption time), the terminal device needs to be able to quickly apply the appropriate beam to receive PDCCH, PDSCH, and/or send PUSCH, PUCCH on the target cell. However, for a CORESET that does not follow the unified TCI state, if it has not been configured with a TCI state pool, or has been configured with a TCI state pool but has not yet activated the TCI state, then what beam the terminal device should apply to receive PDCCH is still an unresolved problem. If this problem is not solved, the terminal device cannot receive PDCCH in such a CORESET immediately after the cell switch, but needs a longer time (for example, after undergoing TCI state pool configuration and TCI state activation) to complete a successful uplink or downlink transmission, thereby prolonging the interruption time.

In response to at least one of the above problems, an embodiment of the present application provides a method and apparatus for receiving and sending data. After receiving a cell switching command, when the CORESET of the target cell is not configured with a TCI state pool, or is configured with a TCI state pool but the TCI state is not activated, the terminal device receives the PDCCH according to the first QCL assumption, wherein the first QCL assumption is determined according to the SSB or TCI state of the target cell. As a result, the terminal device can quickly achieve reception on all types of CORESETs after the cell switching, thereby reducing the switching interruption time. And, for a specific CORESET within a specific time range after receiving a cell switching command, the network device and the terminal device unify their understanding of user behavior.

According to one aspect of an embodiment of the present application, a data receiving method is provided, which is applied to a terminal device, and the method includes:

Receiving first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell;

In a case where the first CORESET of the first target cell is not configured with the first TCI state pool, or in a case where the first CORESET is configured with the first TCI state pool but the TCI state in the first TCI state pool is not activated, PDCCH is received according to the first QCL assumption, or PDCCH is not received.

According to another aspect of an embodiment of the present application, a data sending method is provided, which is applied to a network device, and the method includes:

Sending first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell;

A PDCCH is sent, wherein, when the first CORESET of the first target cell is not configured with the first TCI state pool, or when the first CORESET is configured with the first TCI state pool but the TCI state is not activated, the terminal device receives the PDCCH according to the first QCL assumption, or does not receive the PDCCH.

According to another aspect of an embodiment of the present application, there is provided a data receiving device, which is configured in a terminal device, wherein the data receiving device includes:

A first receiving unit, which receives first indication information, wherein the first indication information indicates a first target cell and a first transmission configuration indication state (TCI state) of the first target cell;

A second receiving unit, which receives a physical downlink control channel (PDCCH) according to a first quasi co-location (QCL) assumption, or does not receive a physical downlink control channel (PDCCH), when the first control resource set (CORESET) of the first target cell is not configured with the first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated.

According to another aspect of an embodiment of the present application, a data sending device is provided, which is configured in a network device, and the data sending device includes:

A first sending unit is configured to send first indication information, wherein the first indication information indicates a first target cell and a first transmission configuration indication state (TCI state) of the first target cell;

A second sending unit, which sends a physical downlink control channel (PDCCH);

Among them, when the first control resource set (CORESET) of the first target cell is not configured with the first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first TCI state pool is not activated, the terminal device receives the physical downlink control channel (PDCCH) according to the first quasi co-location (QCL) assumption, or does not receive the physical downlink control channel (PDCCH).

According to another aspect of an embodiment of the present application, a communication system is provided, including:

A network device that sends first indication information;

A terminal device, which receives first indication information, wherein the first indication information indicates a first target cell and a first transmission configuration indication state (TCI state) of the first target cell; when a first control resource set (CORESET) of the first target cell is not configured with a first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first TCI state pool is not activated, receives a physical downlink control channel (PDCCH) according to a first quasi-co-location (QCL) assumption, or does not receive a physical downlink control channel (PDCCH).

One of the beneficial effects of the embodiments of the present application is that the terminal device can quickly realize reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time, and for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the spirit and clauses of the appended claims, the embodiments of the present application include many changes, modifications and equivalents.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

It should be emphasized that the term “include/comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components.

BRIEF DESCRIPTION OF THE DRAWINGS

The elements and features described in one figure or one implementation of the present application may be combined with one or more Elements and features shown in multiple other figures or embodiments are combined. In addition, in the drawings, similar reference numerals represent corresponding components in several figures and can be used to indicate corresponding components used in more than one embodiment.

FIG1 is a schematic diagram of a communication system according to an embodiment of the present application;

FIG1A is a schematic diagram of a cell switching of an LTM according to an embodiment of the present application;

FIG2 is a schematic diagram of a signaling sending process according to an embodiment of the present application;

FIG3 is another schematic diagram of a signaling sending process according to an embodiment of the present application;

FIG4 is a schematic diagram of a data receiving method according to an embodiment of the present application;

FIG5 is an example diagram of receiving a PDCCH based on the first QCL assumption according to an embodiment of the present application;

FIG6 is another example diagram of receiving a PDCCH based on the first QCL assumption according to an embodiment of the present application;

FIG7 is an example diagram of determining a first QCL hypothesis according to an embodiment of the present application;

FIG8 is an example diagram indicating the second TCI state according to an embodiment of the present application;

FIG9 is an exemplary diagram of an embodiment of the present application taking the QCL source as SSB as an example;

FIG10 is another exemplary diagram of an embodiment of the present application taking the QCL source as SSB as an example;

FIG11 is a schematic diagram of a data sending method according to an embodiment of the present application;

FIG12 is a schematic diagram of a data receiving device according to an embodiment of the present application;

FIG13 is a schematic diagram of a data sending device according to an embodiment of the present application;

FIG14 is a schematic diagram of the structure of a network device according to an embodiment of the present application;

FIG. 15 is a schematic diagram of a terminal device according to an embodiment of the present application.

DETAILED DESCRIPTION

With reference to the accompanying drawings, the above and other features of the present application will become apparent through the following description. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims.

In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements in terms of title, but do not represent the spatial arrangement or time order of these elements, etc., and these elements should not be limited by these terms. The term "and/or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the existence of the stated features, elements, components or components, but do not exclude the existence or addition of one or more other features, elements, components or components.

In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a" or "a type" rather than being limited to the meaning of "one"; in addition, the term "the" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood to mean "at least in part based on...", and the term "based on" should be understood to mean "at least in part based on...", unless the context clearly indicates otherwise.

In an embodiment of the present application, the term "communication network" or "wireless communication network" may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), and the like.

Furthermore, communication between devices in the communication system may be carried out according to communication protocols of any stage, such as but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), etc., and/or other communication protocols currently known or to be developed in the future.

In the embodiments of the present application, the term "network device" refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device. The network device may include, but is not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

Among them, base stations may include but are not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB) and 5G base station (gNB), etc., and may also include remote radio heads (RRH, Remote Radio Head), remote radio units (RRU, Remote Radio Unit), relays or low-power nodes (such as femeto, pico, etc.). And the term "base station" may include some or all of their functions, and each base station can provide communication coverage for a specific geographical area. The term "cell" can refer to a base station and/or its coverage area, depending on the context in which the term is used.

In the embodiments of the present application, the term "user equipment" (UE) or "terminal equipment" (TE) refers to, for example, a device that accesses a communication network through a network device and receives network services. The terminal device may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and the like.

Among them, the terminal device may include but is not limited to the following devices: cellular phone, personal digital assistant (PDA, Personal Digital Assistant), wireless modem, wireless communication device, handheld device, machine type communication device, laptop computer, cordless phone, smart phone, smart watch, digital camera, etc.

For another example, in scenarios such as the Internet of Things (IoT), the terminal device can also be a machine or device for monitoring or measuring, such as but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device to device (D2D) terminal, machine to machine (M2M) terminal, and so on.

In addition, the term "network side" or "network device side" refers to one side of the network, which may be a base station, or may include one or more network devices as above. The term "user side" or "terminal side" or "terminal device side" refers to one side of the user or terminal, which may be a UE, or may include one or more terminal devices as above. Unless otherwise specified herein, "device" may refer to either a network device or a terminal device.

The following describes the scenarios of the embodiments of the present application through examples, but the present application is not limited thereto.

Figure 1 is a schematic diagram of a communication system of an embodiment of the present application, which schematically illustrates a situation taking a terminal device and a network device as an example. As shown in Figure 1, a communication system 100 may include a first network device 101, a second network device 102 and a terminal device 103; for simplicity, Figure 1 only illustrates two network devices and one terminal device as an example, but the embodiment of the present application is not limited to this.

For example, the first network device 101 is a serving cell of the terminal device 103 , and the second network device 102 is a non-serving cell (target cell) of the terminal device 103 .

FIG1A is a schematic diagram of cell switching of LTM in an embodiment of the present application. As shown in FIG1A , cell C0, cell C1 and cell C2 belong to a serving cell. For example, cell C0, cell C1 and cell C2 are a group of cells aggregated by carriers, cell C0 is a primary cell (Pcell), and cell C1 and cell C2 are secondary cells (Scell). For example, the serving cell is at least one of the following: a special cell (SpCell), an Scell, an activated cell, and a deactivated cell. Cell C3, cell C4, cell C5 and cell C6 belong to a non-serving cell. For example, cell C3, cell C4, cell C5 and cell C6 are a group of cells aggregated by carriers, cell C3 is a Pcell, and cell C4, cell C5 and cell C6 are Scells. Rel-18 LTM supports switching from a cell (e.g., cell C0) to a serving cell, an intra-frequency cell, and an inter-frequency cell. For example, cell C0 can be switched to cell C2 (serving cell), cell C3 (intra-frequency), and cell C6 (inter-frequency cell). For example, the cell to which the terminal device may switch is called a candidate cell, and the cell to which the terminal device actually switches is called a target cell. The candidate cell can be a serving cell or a non-serving cell. The terminal device is provided with a candidate cell configuration, receives a cell switch command and a TCI state indication, switches to the target cell, and applies the indicated TCI state to the target cell. The terminal device can switch to one or more target cells, for example, from a group of carrier-aggregated serving cells (cell C0, cell C1, cell C2, and cell C3). C2) Switch to a group of carrier aggregated non-serving cells (cell C3, cell C4, cell C5, cell C6).

FIG. 2 is a schematic diagram of the signaling sending process of an embodiment of the present application; FIG. 3 is another schematic diagram of the signaling sending process of an embodiment of the present application.

The terminal device is provided with measurement configuration and reporting configuration. According to the measurement configuration, the terminal device measures the measurement reference signal (such as synchronization signal and PBCH block (Synchronization Signal and PBCH block, SSB), such as synchronization information block (SSB) for short) of the candidate cell, and reports the measurement result (such as L1-RSRP) to the serving cell. Based on the above measurements, the terminal device can achieve downlink synchronization with the candidate cell (including the target cell) to a certain extent. The terminal device can be triggered by the physical downlink control channel order (PDCCH order) sent by the serving cell to send a physical random access channel (PRACH) to the candidate cell, thereby achieving uplink synchronization with the candidate cell. The terminal device receives a cell switch command (e.g., carried by a media access control (MAC) control element (CE)), the cell switch command indicates a target cell and a TCI state applied on the target cell, the indicated TCI state is a unified TCI state, at least a signal or channel following the unified TCI state applied on the target cell. The terminal device has completed synchronization with the target cell before receiving the cell switch command, and after switching to the target cell, can perform uplink and downlink transmission with the target cell according to the indicated TCI state.

How the terminal device performs uplink and downlink transmission according to the TCI state can follow the existing technology. For example, when the terminal device receives a signal according to the TCI state, it assumes that the signal is quasi-co-located with the reference signal included in the TCI state, or uses the beam for receiving the reference signal included in the TCI state to receive the signal. For example, when the terminal device sends a signal according to the TCI state, it uses the beam (spatial filter) for sending the reference signal included in the TCI state to send the signal, or uses the reciprocity of the uplink and downlink beams to send the signal using the beam for receiving the reference signal included in the TCI state. The following Table 1 schematically illustrates the reference signal included in the TCI state, taking the downlink or combined TCI state (see Section 6.3.2 of TS 38.331-f40) as an example. For the detailed definition of quasi-co-location, please refer to Section 5.1.5 of TS 38.214-f40, which will not be described in detail in this application.

Table 1

Taking FIG. 2 and FIG. 3 as examples, the process of beam management of a type of CORESET in L1/L2based cell switching in Rel-18 is schematically illustrated.

For a control resource set (CORESET) that does not follow a unified transmission configuration indication state (unified TCI state), as shown in FIG2 , after receiving a cell switching command, the terminal device considers that the CORESET does not follow the TCI state indicated in the cell switching command, and then the terminal device receives configuration information about a transmission configuration indication state pool (TCI state pool) of the CORESET, and then receives activation information of the transmission configuration indication state (TCI state), and after receiving the activation information, receives PDCCH in the CORESET based on the activated TCI state; or As shown in Figure 3, the terminal device receives configuration information about the transmission configuration indication state pool (TCI state pool) of the CORESET, and then receives a cell switching command and believes that the CORESET does not follow the TCI state indicated in the cell switching command, and then receives activation information of the transmission configuration indication state (TCI state), and after receiving the activation information, receives PDCCH in the CORESET based on the activated TCI state.

Then, during the time period from when the terminal device receives the cell switching command to before the TCI state is activated (the T1 time period shown in Figure 2 and the T2 time period shown in Figure 3), since the CORESET does not follow the TCI state indicated in the cell switching command, the problem that needs to be solved is based on which TCI state or based on which QCL assumption the terminal device receives PDCCH within the CORESET.

In response to at least one of the above problems, an embodiment of the present application provides a method and device for receiving and sending data.

Embodiments of the first aspect

An embodiment of the present application provides a data receiving method, which is applied on a terminal device side.

FIG. 4 is a schematic diagram of a data receiving method according to an embodiment of the present application. As shown in FIG. 4 , the method includes:

401, a terminal device receives first indication information, where the first indication information indicates a first target cell and a first transmission configuration indication state (TCI state) of the first target cell;

402. When the first control resource set (CORESET) of the first target cell is not configured with the first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated, the terminal device receives a physical downlink control channel (PDCCH) according to a first quasi co-location (QCL) assumption, or does not receive a physical downlink control channel (PDCCH).

As a result, the terminal device can quickly achieve reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time. In addition, for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

It is worth noting that the above FIG. 4 is only a schematic illustration of the embodiment of the present application, taking the terminal device as an example, but the present application is not limited thereto. For example, the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced. In addition, the objects of the above operations can also be adjusted. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 4.

In some embodiments, terms such as "TCI state" and "beam" may be used interchangeably; "cell" The term “TCI state pool” can be equivalently replaced by “TCI state set” or “TCI state list”; the above is merely an exemplary description, and the embodiments of the present application are not limited thereto.

In some embodiments, the first indication information is a cell switch command.

For example, the cell to which the terminal device belongs before cell switching is called a "service cell", and the cell to which the terminal device belongs after cell switching is called a target cell, wherein the first indication information is sent by the service cell, and at least one target cell may be indicated in the first indication information.

For example, the first indication information is carried by a media access control layer control element (MAC CE), for example, the MAC CE indicates a first target cell and a first TCI state of the first target cell. Thus, the cell switching is indicated by layer 1 or layer 2 signaling, so that the terminal device can quickly switch cells. For example, the MAC CE format corresponding to the first indication information can refer to the prior art, and this application does not limit this.

For example, before receiving the first indication information, the terminal device is configured with one or more candidate cells and is provided with configuration information related to the candidate cells. The first indication information indicates that the terminal device switches to one or more candidate cells (i.e., target cells); the configuration information indicates the necessary information required for the terminal device to be served by the target cell after switching, such as reference to the cell RRC reconfiguration information of the prior art, which is not limited in this application.

In some embodiments, the first control resource set (CORESET) is a control resource set (CORESET) of the first target cell that does not follow a unified transmission configuration indication state (unified TCI state).

The following examples illustrate the signaling process in the time domain of CORESET and cell switch command in accordance with whether to follow the unified TCI state:

For example, a cell switch command indicates one or more target cells, and indicates a TCI state for each target cell. Taking a target cell indicated by the cell switch command as an example, the target cell is recorded as a first target cell, and the TCI state indicated for the first target cell is recorded as a first TCI state.

For example, for the first target cell, some CORESETs follow the unified TCI state by default (predefined), and some CORESETs can be configured as to whether to follow the unified TCI state, that is, they can be configured to follow the unified TCI state or not. For example, in a CORESET that follows the unified TCI state, the terminal device receives the PDCCH based on the first TCI state indicated by the cell switch command, that is, it is assumed that the DMRS of the PDCCH is quasi-co-located with the reference signal included in the first TCI state. For example, in a CORESET that does not follow the unified TCI state (first CORESET), if the first CORESET is configured with a first TCI state pool, after the first CORESET is activated with the TCI state in the first TCI state pool, the terminal device can receive the PDCCH based on the first TCI state indicated by the cell switch command. The activated TCI state receives PDCCH.

In some embodiments, the situation where the first CORESET is configured with the first TCI state pool but the TCI states in the first TCI state pool are not activated includes: the first CORESET is configured with the first TCI state pool including at least two TCI states but the TCI states in the first TCI state pool are not activated.

For example, there are two situations:

Case 1: As shown in FIG3 , for a CORESET (first CORESET) that does not follow the unified TCI state, before the serving cell sends a cell switch command, the candidate cell configuration sent by the serving cell (for example, sent through RRC signaling) configures a first TCI state pool for the first CORESET, and the first TCI state pool includes at least two TCI states; after the cell switch command, the target cell sends a transmission configuration indication state activation (TCI state Activation) indication (for example, sent through MAC CE), activating one or more TCI states in the first TCI state pool; for the specific signaling and corresponding signaling format of "candidate cell configuration" and "TCI state Activation", refer to the prior art, and the present application does not limit this;

Case 2: As shown in Figure 2, for the CORESET that does not follow the unified TCI state (the first CORESET), before the serving cell sends the cell switch command, the first CORESET is not configured with the first TCI state pool. After the serving cell sends the cell switch command, the first CORESET is configured with the first TCI state pool by the target cell.

In the above two cases, for example, in the T1 time period of FIG. 2 or in the T2 time period of FIG. 3 , the terminal device receives the PDCCH based on the first QCL assumption, or the terminal device does not receive the PDCCH.

FIG5 is an example diagram of an embodiment of the present application assuming that PDCCH is received based on the first QCL; FIG6 is another example diagram of an embodiment of the present application assuming that PDCCH is received based on the first QCL.

For example, Figure 5 corresponds to Figure 2. As shown in Figure 5, the situation where the first CORESET is not configured with the first TCI state pool is schematically illustrated. When the terminal device receives a cell switching command (cell switch command), the first CORESET has not been configured with the first TCI state pool. After the cell switch command, the first target cell configures the first TCI state pool for the first CORESET, and performs TCI state activation in the first TCI state pool. Within the time range T3 shown in Figure 5, the terminal device receives the PDCCH based on the first QCL assumption.

For example, FIG. 6 corresponds to FIG. 3. As shown in FIG. 6, a schematic illustration is given of a situation where the first CORESET is configured with the first TCI state pool but the TCI state in the first TCI state pool is not activated. Before the terminal device receives the cell switch command, the first CORESET is configured with the first TCI state pool by the serving cell, wherein the first TCI state pool includes at least two TCI states. After the cell switch command, the first target cell performs TCI state activation in the first TCI state pool. Within the time range T4 shown in FIG. 6, the terminal device receives the cell switch command. The end device receives the PDCCH based on the first QCL hypothesis.

Therefore, it is possible to clarify how the terminal device receives PDCCH in the first CORESET within the above-mentioned T3 or T4 time range.

In some embodiments, the first quasi-co-site (QCL) assumption is determined based on a synchronization information block (SSB) of the first target cell and/or a first transmission configuration indication state (TCI state) and/or a second transmission configuration indication state (TCI state) indicated by the first indication information.

For example, the first target cell is associated with multiple SSBs, which are distinguished by SSB indexes (index), and the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with an SSB of the first target cell. For example, the first target cell is associated with multiple TCI states, which are distinguished by TCI state identifiers (IDs), and the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with a reference signal included in a TCI state (first TCI state or second TCI state) of the first target cell, where a TCI state may include one or more reference signals. Thus, the terminal device may receive the PDCCH using a beam that receives an SSB, or may receive the PDCCH using a beam that receives a reference signal included in a TCI state.

In some embodiments, the first quasi co-location (QCL) assumption includes at least one of the following:

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) indicated by the second indication information;

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) used by the terminal device to determine a timing advance (TA) of the first target cell;

Assume that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) with the maximum layer 1-reference signal received power (L1-RSRP) of the first target cell reported by the terminal device;

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) indicated by the first indication information, wherein the indicated synchronization information block (SSB) is a synchronization information block (SSB) of the first target cell;

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) and a reference signal included in the first transmission configuration indication state (TCI state) indicated by the first indication information are quasi-co-located;

It is assumed that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a reference signal included in a second transmission configuration indication state (TCI state) indicated by the first indication information, wherein the second transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) of the first target cell.

The following are examples of the specific contents of different QCL assumptions:

The following is an example of “assuming that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) and the synchronization information block (SSB) indicated by the second indication information are quasi-co-located”:

In some embodiments, the terminal device receives second indication information before receiving the first indication information, wherein the second indication information indicates a physical downlink control channel order (PDCCH order), and the physical downlink control channel order (PDCCH order) instructs the terminal device to send a physical random access channel (PRACH) to the first target cell.

For example, FIG7 is an example diagram of determining the first QCL assumption in an embodiment of the present application. For example, the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with the SSB indicated by the PDCCH order. FIG7 schematically illustrates this, for example, the second indication information is DCI format 1_0, which is used for random access triggered by PDCCH order, and the second indication information can also be referred to as PDCCH order. For the specific content of DCI format 1_0, please refer to the prior art. For example, before the serving cell (network device 101 shown in FIG. 1 ) sends the first indication information (cell switch command), the serving cell (network device 101 shown in FIG. 1 ) may send the second indication information (PDCCH order) to trigger the terminal device to send PRACH to the first target cell (network device 102 shown in FIG. 1 ), and the network device 102 calculates the timing advance (TA) of the first target cell based on the PRACH. The network device 102 and the network device 101 may exchange information through backhaul, so the network device 102 and/or the network device 101 may notify the terminal device 103 of the TA (for example, by sending a random access response (RAR) or a cell switch command), thereby achieving early uplink synchronization. The second indication information (PDCCH order) indicates an SSB by indicating an SSB index. The terminal device determines the RACH occasion for sending the PRACH based on the indicated SSB index (for example, see the prior art for determining the RACH occasion, which is not limited in this application). The SSB indicated by the PDCCH order is the SSB with the index SSB index. As a result, the terminal device can receive the PDCCH according to the beam corresponding to the SSB indicated by the PDCCH order.

The following is an example of “assuming that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) and the synchronization information block (SSB) used by the terminal device to determine the timing advance (TA) of the first target cell are quasi-co-located”:

In some embodiments, the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with the SSB used by the terminal device to determine the TA (Timing Advance) of the first target cell. Before receiving the first indication information (cell switch command), the terminal device obtains the downlink timing difference between the SSB sent by the serving cell and the SSB sent by the first target cell, and derives and calculates the TA of the first target cell based on the downlink timing difference, thereby achieving early uplink synchronization. The SSB sent by the first target cell is the SSB used by the terminal device to determine the TA of the first target cell. As a result, the terminal device can receive the beam corresponding to the SSB sent by the first target cell for calculating the TA. PDCCH.

The following is an example of “assuming that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the synchronization information block (SSB) with the maximum layer 1-reference signal received power (L1-RSRP) of the first target cell reported by the terminal device”:

In some embodiments, the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with the SSB with the largest L1-RSRP of the first target cell reported by the terminal device. Before receiving the first indication information (cell switch command), the terminal device performs SSB-based measurement and reporting. The terminal device measures L1-RSRP for one or more SSBs sent by one or more candidate cells, and reports the SSB index of one or more candidate cells and their L1-RSRP measurement results. The network device can decide to switch the terminal device to one or more candidate cells based on the reported SSB and L1-RSRP (the candidate cell becomes the target cell after switching). The terminal device assumes that the DMRS of the PDCCH is quasi-co-located with a certain SSB of the reported first target cell. The terminal device may report multiple SSBs of the first target cell. In this case, the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the SSB with the largest L1-RSRP among multiple SSBs. As a result, the terminal device can receive the PDCCH according to the beam corresponding to the SSB with the largest L1-RSRP in the reported first target cell.

The following is an example of “assuming that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the synchronization information block (SSB) indicated by the first indication information, wherein the indicated synchronization information block (SSB) is the synchronization information block (SSB) of the first target cell”:

In some embodiments, the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with the SSB of the first target cell indicated by the first indication information (cell switch command). For example, in addition to indicating the first TCI state, the first indication information (cell switch command) also indicates an SSB of the first target cell (for example, indicating an SSB index), and the indicated SSB is used to determine the quasi-co-location of the DMRS applied to the PDCCH. As a result, the terminal device can receive the PDCCH according to the beam corresponding to the SSB indicated by the first indication information.

The following is an example of “assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) and a reference signal included in the first transmission configuration indication state (TCI state) indicated by the first indication information are quasi co-located”:

In some embodiments, the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with the reference signal included in the first TCI state indicated by the first indication information (cell switch command). For example, although the CORESET where the PDCCH is located does not follow the unified TCI state, in the initial stage, it is still assumed that the CORESET is quasi-co-located with the first TCI state, and the "initial stage" refers to the T1 time period shown in Figure 2 or the T2 time period shown in Figure 3 or the T3 time period shown in Figure 5 or the T4 time period shown in Figure 6. For example, assuming that the measurement If all reference signals are SSB, then after the cell switching is just completed (for example, in the T1 time period shown in Figure 2), the first target cell can only use the wide beam that sends SSB to send signals or channels (that is, the beam corresponding to the first TCI state is also a beam that sends SSB). Although CORESET does not follow the unified TCI state, it can still be assumed that CORESET temporarily follows the unified TCI state in the initial stage. As a result, the terminal device can receive PDCCH according to the beam corresponding to the first TCI state indicated by the first indication information.

The following is an example of “assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a reference signal included in the second transmission configuration indication state (TCI state) indicated by the first indication information, wherein the second transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) of the first target cell”:

In some embodiments, the second transmission configuration indication state (TCI state) and the first transmission configuration indication state (TCI state) are from a second transmission configuration indication state pool (TCI state pool), wherein the second transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool); or, the second transmission configuration indication state (TCI state) is from a third transmission configuration indication state pool (TCI state pool), and the first transmission configuration indication state (TCI state) is from a fourth transmission configuration indication state pool (TCI state pool), wherein the third transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool), and the fourth transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool).

For example, FIG8 is an example diagram indicating the second TCI state in an embodiment of the present application. In some embodiments, the first QCL assumption refers to assuming that the DMRS of the PDCCH is quasi-co-located with the reference signal included in the second TCI state of the first target cell indicated by the first indication information (cell switch command). FIG8 schematically illustrates the process related to the second TCI state indication, and takes a second TCI state pool as an example to schematically illustrate the configuration of the second TCI state pool and the activation of the TCI state, wherein the activation of the TCI state is an optional step. In addition to indicating the first TCI state, the first indication information (cell switch command) also indicates the second TCI state. The first TCI state is used as a unified TCI state, and the second TCI state is used in the "initial stage" (for example, the T1 time period shown in FIG2 or the T2 time period shown in FIG3 or the T3 time period shown in FIG5 or the T4 time period shown in FIG6).

In some embodiments, the second TCI state and the first TCI state may come from the same TCI state pool (the second TCI state pool), or may come from two independent TCI state pools (the second TCI state comes from the third TCI state pool and the first TCI state comes from the fourth TCI state pool). The terminal device is configured with the second TCI state pool or the third TCI state pool before receiving the first indication information (cell switch command). pool and a fourth TCI state pool (FIG. 8 only shows an example of configuring a second TCI state pool). For example, since the second TCI state is only used for CORESET (control channel) and the first TCI state is used for data channels and control channels following the unified TCI state, the second TCI state and the first TCI state can come from the same TCI state pool, or can come from two independent TCI state pools.

In some embodiments, the second TCI state and the first TCI state may come from the same activated TCI state subset (a TCI state subset activated in the second TCI state pool), or may come from two independent activated TCI state subsets (a TCI state subset activated in the third TCI state pool and a TCI state subset activated in the fourth TCI state pool). Before receiving the first indication information (cell switch command), the terminal device has a TCI state subset activated in the second TCI state pool, or has a TCI state subset activated in the third TCI state pool and a fourth TCI state pool, respectively. In some embodiments, the second TCI state may be replaced with "a third TCI state and a fourth TCI state", that is, the CORESET is not limited to being associated with only one TCI state, but may also be associated with two TCI states. Thus, the terminal device can receive PDCCH according to the beam corresponding to the second TCI state (or "third TCI state and fourth TCI state") indicated by the first indication information.

In some embodiments, the second TCI state pool is the same as or different from the first TCI state pool, the third TCI state pool is the same as or different from the first TCI state pool, and the fourth TCI state pool is the same as or different from the first TCI state pool.

For example, taking Figure 2 or Figure 5 as an example, the first TCI state pool is the TCI state pool configured by the target cell for the terminal device; the second TCI state pool is the TCI state pool configured by the serving cell for the terminal device (not shown in Figures 2 and 5), wherein the first TCI state pool and the second TCI state pool are different TCI state pools, similarly, the first TCI state pool and the third TCI state pool and the fourth TCI state pool are different TCI state pools; for another example, taking Figure 3 or Figure 6 as an example, the first TCI state pool is the TCI state pool configured by the serving cell for the CORESET of the terminal device; the second TCI state pool is also the TCI state pool configured by the serving cell for the CORESET of the terminal device (not shown in Figures 3 and 6), wherein the first TCI state pool and the second TCI state pool are the same TCI state pool, similarly, the first TCI state pool and the third TCI state pool are the same TCI state pool, since the first TCI state pool is the TCI state pool configured for the CORESET, the fourth TCI state pool is the TCI state pool configured for the data channel and control channel following the unified TCI state pool, so the first TCI state pool and the fourth TCI state pool are different TCI state pools; optionally, the above is only an exemplary description and does not limit the relationship between the first TCI state pool in Figures 2, 3, 5, and 6 and the second TCI state pool, the third TCI state pool, and the fourth TCI state pool of the present application, and the relationship between the above-mentioned different TCI state pools is not listed one by one.

In some embodiments, the first control resource set (CORESET) is a control resource set (CORESET) other than control resource set 0 (CORESET0), wherein the first control resource set (CORESET) is associated with at least one common search space set (CSS set) other than a type 3 physical downlink control channel common search space set (Type3-PDCCH CSS set).

For example, the first CORESET is a CORESET other than CORESET 0, wherein a CORESET is associated with one or more search space sets (SS sets, search space sets), and the SS set may be a common search space set (CSS set) or a UE-specific search space set (USS set). The terminal device may monitor multiple types of SS sets, such as Type0-PDCCH CSS set, Type0A-PDCCH CSS set, Type0B-PDCCH CSS set, Type1-PDCCH CSS set, Type1A-PDCCH CSS set, Type2-PDCCH CSS set, Type2A-PDCCH CSS set, Type3-PDCCH CSS set, and USS set. For more detailed definitions, please refer to Section 10.1 of standard TS 38.213-h40.

For example, the first CORESET is associated with at least one CSS set other than the Type3-PDCCH CSS set. For example, the first CORESET is associated with one or more CSS sets other than the Type3-PDCCH CSS set and one or more Type3-PDCCH CSS sets. For example, the first CORESET is associated with one or more CSS sets other than the Type3-PDCCH CSS set. For example, the first CORESET is associated with one or more CSS sets other than the Type3-PDCCH CSS set, one or more Type3-PDCCH CSS sets, and one or more USS sets. For example, the first CORESET is associated with one or more CSS sets other than the Type3-PDCCH CSS set and one or more USS sets. Thus, the association relationship between the first CORESET and the CSS set and/or USS set can be clarified.

In some implementations, the first control resource set (CORESET) is control resource set 0 (CORESET0).

In some embodiments, the terminal device also receives a physical downlink shared channel (PDSCH) scheduled by the physical downlink control channel (PDCCH) according to the first quasi co-location (QCL) assumption.

For example, the terminal device receives the PDCCH based on the first QCL assumption, and receives the PDSCH scheduled by the PDCCH based on the first QCL assumption.

In some embodiments, the first indication information also indicates a second target cell; when the second control resource set (CORESET) of the second target cell is not configured with the fifth transmission configuration indication state pool (TCI state pool), or when the second control resource set (CORESET) is configured with the fifth transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) is not activated, the physical downlink control channel (PDCCH) is received according to the first quasi co-location (QCL) assumption, or, the physical downlink control channel (PDCCH) is received according to the second quasi co-location (QCL) assumption, or, the physical downlink control channel (PDCCH) is not received.

In some implementations, the second control resource set (CORESET) is a non- A control resource set (CORESET) that follows the unified TCI state.

In some embodiments, the second target cell and the first target cell belong to the same simultaneous transmission configuration indication state (TCI state) update list, and/or, the same cell group (cell group), and/or, the same time advance group (TA group, TAG), and/or, the control resource set (CORESET) index of the second control resource set (CORESET) of the second target cell is the same as the control resource set (CORESET) index of the first control resource set (CORESET) of the first target cell.

In some embodiments, the second quasi co-location (QCL) assumption is determined based on a synchronization information block (SSB) and/or a third transmission configuration indication state (TCI state) of the second target cell,

The synchronization information block (SSB) of the second target cell in the second quasi co-location (QCL) assumption has the same index as the synchronization information block (SSB) of the first target cell in the first quasi co-location (QCL) assumption, and/or,

Among them, the third transmission configuration indication state (TCI state) in the second quasi co-location (QCL) assumption has the same index as the first transmission configuration indication state (TCI state) or the second transmission configuration indication state (TCI state) in the first quasi co-location (QCL) assumption.

For example, the first indication information (cell switch command) further indicates a second target cell. For a CORESET (second CORESET) of the second target cell that does not follow the unified TCI state, when the second CORESET is not configured with the fifth TCI state pool, or when the second CORESET is configured with the fifth TCI state pool but the TCI state in the fifth TCI state pool is not activated, the terminal device receives the PDCCH based on the first QCL assumption, or receives the PDCCH based on the second QCL assumption, or does not receive the PDCCH.

For example, the second target cell and the first target cell belong to the same simultaneous TCI update list, and/or, the same cell group, and/or, the same TA group, and/or, the CORESET index of the second CORESET of the second target cell is equal to the CORESET index of the first CORESET of the first target cell.

For example, the second QCL assumption is determined based on the SSB and/or the third TCI state of the second target cell. The SSB in the second QCL assumption has the same index as the SSB in the first QCI assumption, and/or the third TCI state in the second QCL assumption has the same TCI state ID as the first TCI state or the second TCI state in the first QCI assumption.

The following is an example of a terminal device receiving a PDCCH in a CORESET of a second target cell based on a second QCL assumption:

For example, the terminal device receives the PDCCH in the CORESET of the second target cell based on the second QCL assumption. FIG9 is an example diagram of an embodiment of the present application taking the QCL source as SSB as an example. For example, the first indication information (cell switch command) indicates multiple target cells, including a first target cell and a second target cell.

For example, for the first CORESET of the first target cell, the first CORESET has a first index, for example, the value of the first index is 1, and the first CORESET with the first index 1 is correspondingly recorded as the first CORESET 1 ("1" is an example of an index value, and can also be 2, 3... or other numerical values, etc., which are not limited in the present application). According to the aforementioned embodiment, the terminal device receives the PDCCH in the first target cell based on the first QCL assumption. For example, based on the first QCL assumption, the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the SSB with the first index in the SSB of the first target cell (for example, the first SSB 0), or is quasi-co-located with the reference signal included in the first TCI state or the second TCI state (for example, the first TCI state "00000000" or the second TCI state "00000000") with a first identifier (ID) in the TCI state of the first target cell (not shown in Figure 9). For the second target cell, if the second target cell and the first target cell belong to the same simultaneous TCI-UpdateList, or the same cell group (primary cell group (MCG) or secondary cell group (SCG) or carrier aggregated cell group), or the same TA group (TAG), the second QCL assumes a second CORESET with a second index that is the same as the first index of the first CORESET applied to the second target cell, for example, the second CORESET has a second index, wherein the second index of the second CORESET is the same as the index value of the first index of the first CORESET, for example, the first CORESET 1 corresponds to the second CORESET 1, wherein the second CORESET 1 is, for example, a second CORESET with an index of "1" applied to all configured downlink BWPs of the second target cell. For example, "first CORESET 1" and "second CORESET 1" have the same index value "1", but the configuration of the specific CORESET is obtained according to the CORESET configured in each cell.

For example, the second QCL assumption is determined based on the SSB and/or the third TCI state of the second target cell. The second index of the SSB in the second QCL assumption is the same as the first index of the SSB in the first QCI assumption, and/or the second identifier of the TCI state in the second QCL assumption is the same as the first identifier of the TCI state in the first QCI assumption. For example, for the second CORESET with a second index in the second target cell, the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the SSB (second SSB) with a second index that is the same as the first index in the SSB of the second target cell, or the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the reference signal included in the TCI state with a second identifier that is the same as the first identifier in the TCI state of the second target cell.

For example, when the first indication information indicates the second target cell, the second SSB corresponding to the second SSB0 in the second QCL assumption is obtained according to the first SSB0 in the first QCL assumption (obtained according to the above implementation), thereby receiving the PDCCH based on the beam of the second SSB. Alternatively, when the first indication information indicates the second target cell, the first TCI state "00000000" in the first QCL assumption (obtained according to the above implementation) is obtained. The second TCI state corresponding to the second TCI state "00000000" in the second QCL assumption is obtained by the formula, thereby receiving PDCCH based on the beam of the second TCI state.

For example, when the first QCL hypothesis and the second QCL hypothesis are determined based on the TCI state, the number of TCI states may also be two. In this case, the second identifiers of the two TCI states in the second QCL hypothesis are respectively the same as the first identifiers of the two TCI states in the first QCI hypothesis.

Thus, the network device does not need to indicate the source reference signal of QCL for each target cell, or the terminal device does not need to determine the source reference signal of QCL for each target cell separately. When the network device indicates the QCL source reference signal for the first target cell, or the terminal device determines the QCL source reference signal for the first target cell, the QCL source reference signal of the second target cell can be determined based on the relevant index or identifier of the QCL source reference signal of the first target cell.

The following is an example of a terminal device receiving a PDCCH in a CORESET of a second target cell based on a first QCL assumption:

Figure 10 is another example diagram of an embodiment of the present application taking the QCL source as SSB as an example. As shown in Figure 10, the explanation is still based on the assumptions of the previous embodiment. The difference from the previous embodiment is that for the second CORESET with a second index of the second target cell, the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the SSB with a first index (first SSB) in the SSB of the first target cell, or the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the reference signal included in the first TCI state or the second TCI state with a first identifier in the TCI state of the first target cell; for the DMRS of the PDCCH of the second target cell, the terminal device assumes that it is quasi-co-located with the reference signal of the first target cell.

For example, when the first indication information indicates the second target cell, the PDCCH of the second target cell is received according to the beam of the first SSB0 (obtained according to the above implementation) in the first QCL assumption; or, when the first indication information indicates the second target cell, the PDCCH is received according to the beam of the first TCI state "00000000" or the second TCI state "00000000" (obtained according to the above implementation) in the first QCL assumption.

In some embodiments, the third transmission configuration indication state (TCI state) is a transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool).

For example, a fifth transmission configuration indication state pool (TCI state pool) is configured for the CORESET of the second target cell of the terminal device, wherein the third TCI state is a TCI state in the fifth TCI state pool. For example, the configuration method is similar to the above-mentioned configuration of the second TCI state pool or the third TCI state pool. For example, the fifth TCI state pool is configured before receiving the first indication information.

In some embodiments, when the terminal device is configured with the first transmission configuration indication state pool (TCI state pool) and the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is activated before receiving the first indication information, the physical downlink control channel (PDCCH) is received based on the assumption that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the transmission configuration indication state (TCI state) in the activated first transmission configuration indication state pool (TCI state pool).

In some embodiments, for example, before the terminal device receives the first indication information (cell switch command), the CORESET that does not follow the unified TCI state is always configured with the fourth TCI state pool by the serving cell, and the TCI state is activated by the serving cell in the fourth TCI state pool. Therefore, after receiving the first indication information (cell switch command), the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the activated TCI state. The fourth TCI state pool is equivalent to the first TCI state pool, or the second TCI state pool or the third TCI state pool. Therefore, it is clarified how the terminal device receives the PDCCH in the CORESET that does not follow the unified TCI state after receiving the first indication information (cell switch command).

In some embodiments, when a first control resource set (CORESET) is configured as a control resource set (CORESET) of a unified transmission configuration indication state (unified TCI state) in a candidate cell configuration, a terminal device receives a physical downlink control channel (PDCCH) based on the assumption that the DMRS of the physical downlink control channel (PDCCH) is quasi-co-located with the first TCI state.

In some embodiments, the configuration of the first CORESET is provided in the candidate cell configuration, and all first CORESETs are configured to follow the unified TCI state. Therefore, after receiving the first indication information (cell switch command), the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with the first TCI state indicated by the first indication information (cell switch command). In other words, the terminal device expects that any first CORESET is configured to follow the unified TCI state, so that the terminal device can apply the first TCI state in the first CORESET. For example, after sending the first indication information (cell switch command), the network device can configure the subsequent CORESET that does not follow the unified TCI state through RRC reconfiguration. Therefore, it is clarified how the terminal device receives the PDCCH in the CORESET that does not follow the unified TCI state after receiving the first indication information (cell switch command).

In some embodiments, when the first CORESET is configured with the first TCI state pool including one TCI state in the candidate cell configuration, the PDCCH is received based on the assumption that the DMRS of the PDCCH is quasi-co-located with the one TCI state.

In some embodiments, a first TCI state pool is configured for all first CORESETs in the candidate cell configuration, and the first TCI state pool of each first CORESET includes only one TCI state. After an indication message (cell switch command), in a first CORESET, the terminal device assumes that the DMRS of the PDCCH is quasi-co-located with a TCI state included in the first TCI state pool of the first CORESET. In other words, the terminal device expects that any first CORESET is configured with a first TCI state pool, and the first TCI state pool only includes one TCI state, so that the terminal device can apply the TCI state included in the first TCI state pool in the first CORESET.

In some embodiments, for a first CORESET of a first target cell, the terminal device assumes that a DMRS of a PDCCH of the first CORESET is quasi-co-located with an SSB of the first target cell or a reference signal included in a TCI state of the first target cell, and for a second CORESET of a second target cell, the terminal device assumes that a DMRS of a PDCCH of the second CORESET is quasi-co-located with an SSB of the second target cell or a reference signal included in a TCI state of the second target cell, wherein the SSB of the second target cell has the same index as the SSB of the first target cell, or the TCI state of the second target cell has the same identifier as the TCI state of the first target cell.

In some embodiments, for the first target cell, when the terminal device determines that the DMRS of the PDCCH of the first CORESET is quasi-co-located with the SSB of the first target cell or the reference signal of the TCI state of the first target cell (for example, determined using the above-mentioned implementation mode of the present application, and the present application is not limited to this), for the second target cell, the terminal device assumes that the DMRS of the PDCCH of the second CORESET is quasi-co-located with the SSB of the second target cell or the reference signal of the TCI state of the second target cell, wherein the SSB of the second target cell has the same index as the SSB of the first target cell, or the TCI state of the second target cell has the same identifier as the TCI state of the first target cell.

In some embodiments, for a first CORESET of a first target cell, the terminal device assumes that a DMRS of a PDCCH of the first CORESET is quasi-co-located with an SSB of the first target cell or a reference signal included in a TCI state of the first target cell; and for a second CORESET of a second target cell, the terminal device assumes that a DMRS of a PDCCH of the second CORESET is quasi-co-located with an SSB of the first target cell or a reference signal included in a TCI state of the first target cell.

In some embodiments, for the first target cell, when the terminal device determines that the DMRS of the PDCCH of the first CORESET is quasi-co-located with the SSB of the first target cell or the reference signal of the TCI state of the first target cell (for example, determined using the above-mentioned implementation mode of the present application, and the present application is not limited to this), for the second target cell, the terminal device assumes that the DMRS of the PDCCH of the second CORESET is quasi-co-located with the SSB of the first target cell or the reference signal of the TCI state of the first target cell.

In some implementations, the first target cell is a non-serving cell, and/or the second target cell is a non-serving cell.

The above embodiments are merely exemplary of the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the above embodiments that the terminal device can quickly realize reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time, and for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

Embodiments of the second aspect

The embodiment of the present application provides a data transmission method, which is applied to a network device side. The embodiment of the present application can be combined with the embodiment of the first aspect, or can be implemented separately. The same contents as the embodiment of the first aspect are not repeated here.

FIG. 11 is a schematic diagram of a data sending method according to an embodiment of the present application. As shown in FIG. 11 , the method includes:

1101. A network device sends first indication information, where the first indication information indicates a first target cell and a first TCI state of the first target cell.

1102. The network device sends a PDCCH, wherein, when the first CORESET of the first target cell is not configured with the first TCI state pool, or when the first CORESET is configured with the first TCI state pool but the TCI state in the first TCI state pool is not activated, the terminal device receives the PDCCH according to the first QCL assumption, or does not receive the PDCCH.

As a result, the terminal device can quickly achieve reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time. In addition, for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

In some embodiments, the method further includes: sending second indication information before sending the first indication information, wherein the second indication information indicates a PDCCH order, and the PDCCH order indicates the terminal device to send a PRACH to the first target cell.

It is worth noting that the above FIG. 11 is only a schematic illustration of the embodiment of the present application, but the present application is not limited thereto. For example, the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 11.

The above embodiments are merely exemplary of the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the above embodiments that the terminal device can quickly realize reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time, and for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

Embodiments of the third aspect

The embodiment of the present application provides a data receiving device, which may be, for example, a terminal device, or may be one or more components or assemblies configured in the terminal device, and the same contents as those in the embodiment of the first aspect will not be repeated.

FIG12 is a schematic diagram of a data receiving device according to an embodiment of the present application. As shown in FIG12 , the data receiving device 1200 includes:

A first receiving unit 1201 receives first indication information, wherein the first indication information indicates a first target cell and a first transmission configuration indication state (TCI state) of the first target cell;

The second receiving unit 1202 receives a physical downlink control channel (PDCCH) according to a first quasi-co-location (QCL) assumption, or does not receive a physical downlink control channel (PDCCH), when the first control resource set (CORESET) of the first target cell is not configured with the first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated.

As a result, the terminal device can quickly achieve reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time. In addition, for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

In some embodiments, the first quasi-co-site (QCL) assumption is determined based on a synchronization information block (SSB) of the first target cell and/or the first transmission configuration indication state (TCI state) and/or a second transmission configuration indication state (TCI state) indicated by the first indication information.

In some embodiments, the first control resource set (CORESET) is a control resource set (CORESET) of the first target cell that does not follow a unified transmission configuration indication state (unified TCI state).

In some implementations, the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated, including: the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state) including at least two transmission configuration indication states (TCI state); A transmission configuration indication state pool (TCI state pool) is configured but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated.

In some implementations, the first indication information is a cell switching command.

In some embodiments, the first quasi co-location (QCL) assumption includes at least one of the following:

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) indicated by the second indication information;

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) used by the terminal device to determine a timing advance (TA) of the first target cell;

Assume that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) with the maximum layer 1-reference signal received power (L1-RSRP) of the first target cell reported by the terminal device;

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) indicated by the first indication information, wherein the indicated synchronization information block (SSB) is a synchronization information block (SSB) of the first target cell;

Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) and a reference signal included in the first transmission configuration indication state (TCI state) indicated by the first indication information are quasi-co-located;

It is assumed that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a reference signal included in a second transmission configuration indication state (TCI state) indicated by the first indication information, wherein the second transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) of the first target cell.

In some embodiments, the first receiving unit 1201 receives the second indication information before receiving the first indication information, wherein the second indication information indicates a physical downlink control channel order (PDCCH order), and the physical downlink control channel order (PDCCH order) instructs the terminal device to send a physical random access channel (PRACH) to the first target cell.

In some embodiments, the second transmission configuration indication state (TCI state) and the first transmission configuration indication state (TCI state) are from a second transmission configuration indication state pool (TCI state pool), wherein the second transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool); or, the second transmission configuration indication state (TCI state) is from a third transmission configuration indication state pool (TCI state pool), and the first transmission configuration indication state (TCI state) is from a fourth transmission configuration indication state pool (TCI state pool), wherein the third transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool), and the fourth transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool). The transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool).

In some embodiments, the first control resource set (CORESET) is a control resource set (CORESET) other than control resource set 0 (CORESET0), wherein the first control resource set (CORESET) is associated with at least one common search space set (CSS set) other than a type 3 physical downlink control channel common search space set (Type3-PDCCH CSS set).

In some embodiments, the first control resource set (CORESET) is control resource set 0 (CORESET0).

In some implementations, the second receiving unit 1202 further receives a physical downlink shared channel (PDSCH) scheduled by the physical downlink control channel (PDCCH) according to the first quasi co-location (QCL) assumption.

In some embodiments, wherein the first indication information also indicates a second target cell; when the second control resource set (CORESET) of the second target cell is not configured with the fifth transmission configuration indication state pool (TCI state pool), or when the second control resource set (CORESET) is configured with the fifth transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool) is not activated, a physical downlink control channel (PDCCH) is received according to the first quasi co-location (QCL) assumption, or, a physical downlink control channel (PDCCH) is received according to the second quasi co-location (QCL) assumption, or, a physical downlink control channel (PDCCH) is not received.

In some embodiments, the second control resource set (CORESET) is a control resource set (CORESET) of the second target cell that does not follow a unified transmission configuration indication state (unified TCI state).

In some embodiments, the situation in which the second control resource set (CORESET) is configured with the fifth transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool) is not activated includes: the second control resource set (CORESET) is configured with the fifth transmission configuration indication state pool (TCI state pool) including at least two transmission configuration indication states (TCI state) but the transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool) is not activated.

In some embodiments, the second target cell and the first target cell belong to the same simultaneous transmission configuration indication state (TCI state) update list, and/or the same cell group (cell group), and/or the same timing advance group (TA group), and/or the control resource set (CORESET) index of the second control resource set (CORESET) of the second target cell is the same as the first control resource set of the first target cell. The control resource set (CORESET) index is the same as that of the (CORESET).

In some embodiments, the second quasi-co-location (QCL) assumption is determined based on the synchronization information block (SSB) and/or the third transmission configuration indication state (TCI state) of the second target cell, wherein the synchronization information block (SSB) of the second target cell in the second quasi-co-location (QCL) assumption has the same index as the synchronization information block (SSB) of the first target cell in the first quasi-co-location (QCL) assumption, and/or, wherein the third transmission configuration indication state (TCI state) in the second quasi-co-location (QCL) assumption has the same index as the first transmission configuration indication state (TCI state) or the second transmission configuration indication state (TCI state) in the first quasi-co-location (QCL) assumption.

In some embodiments, the third transmission configuration indication state (TCI state) is a transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool).

In some embodiments, wherein, before receiving the first indication information, the second receiving unit 1202 is configured with the first transmission configuration indication state pool (TCI state pool) and the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is activated, the physical downlink control channel (PDCCH) is received based on the assumption that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the transmission configuration indication state (TCI state) in the activated first transmission configuration indication state pool (TCI state pool).

In some embodiments, the second receiving unit 1202 receives the physical downlink control channel (PDCCH) based on the assumption that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the first transmission configuration indication state (TCI state) when the first control resource set (CORESET) is configured as a control resource set (CORESET) of a unified transmission configuration indication state (TCI state) in the candidate cell configuration.

In some embodiments, where the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) including a transmission configuration indication state (TCI state) in the candidate cell configuration, the physical downlink control channel (PDCCH) is received based on the assumption that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the one transmission configuration indication state (TCI state).

In some implementations, the first target cell is a non-serving cell, and/or the second target cell is a non-serving cell.

The above embodiments are merely exemplary of the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or One or more of the above embodiments may be combined.

It is worth noting that the above only describes the components or modules related to the present application, but the present application is not limited thereto. The data receiving device 1200 may also include other components or modules, and the specific contents of these components or modules may refer to the relevant technology.

In addition, for the sake of simplicity, FIG. 12 only exemplifies the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used. The above-mentioned various components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.

It can be seen from the above embodiments that the terminal device can quickly realize reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time, and for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

Embodiments of the fourth aspect

The embodiment of the present application provides a data sending device, which may be, for example, a network device, or may be one or more components or assemblies configured in the network device, and the same contents as those in the embodiment of the second aspect will not be repeated.

FIG13 is a schematic diagram of a data transmission device according to an embodiment of the present application. As shown in FIG13 , the data transmission device 1300 includes:

A first sending unit 1301 sends first indication information, wherein the first indication information indicates a first transmission configuration indication state (TCI state) of a first target cell and the first target cell;

The second sending unit 1302 sends a physical downlink control channel (PDCCH); wherein, when the first control resource set (CORESET) of the first target cell is not configured with the first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated, the terminal device receives the physical downlink control channel (PDCCH) according to the first quasi-co-location (QCL) assumption, or does not receive the physical downlink control channel (PDCCH).

As a result, the terminal device can quickly achieve reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time. In addition, for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

In some implementations, the first sending unit 1301 sends second indication information before sending the first indication information, wherein the second indication information indicates a physical downlink control channel order (PDCCH order), The physical downlink control channel order (PDCCH order) instructs the terminal device to send a physical random access channel (PRACH) to the first target cell.

In some embodiments, the physical downlink control channel (PDCCH) schedules the physical downlink shared channel (PDSCH) or the physical uplink shared channel (PUSCH).

The above embodiments are merely exemplary of the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It is worth noting that the above only describes the components or modules related to the present application, but the present application is not limited thereto. The data sending device 1300 may also include other components or modules, and the specific contents of these components or modules may refer to the relevant technology.

In addition, for the sake of simplicity, FIG. 13 only exemplifies the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used. The above-mentioned various components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.

It can be seen from the above embodiments that the terminal device can quickly realize reception on all types of CORESETs after cell switching, thereby reducing the switching interruption time, and for a specific CORESET within a specific time range after receiving the cell switching command, the network device and the terminal device unify their understanding of user behavior.

Embodiments of the fifth aspect

An embodiment of the present application also provides a communication system, and reference may be made to FIG1 . The contents that are the same as those of the embodiments of the first to fourth aspects will not be repeated herein.

In some implementations, the communication system 100 may include at least: a network device and a terminal device, wherein:

A network device that sends first indication information;

A terminal device receives first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell;

In a case where the first CORESET of the first target cell is not configured with the first TCI state pool, or in a case where the first CORESET is configured with the first TCI state pool but the TCI state in the first transmission configuration indication state pool (TCI state pool) is not activated, PDCCH is received according to the first QCL assumption, or PDCCH is not received.

The embodiment of the present application further provides a network device, which may be, for example, a base station, but the present application is not limited thereto. It is other network equipment.

FIG14 is a schematic diagram of the composition of a network device according to an embodiment of the present application. As shown in FIG14 , the network device 1400 may include: a processor 1410 (e.g., a central processing unit CPU) and a memory 1420; the memory 1420 is coupled to the processor 1410. The memory 1420 may store various data; in addition, it may store a program 1430 for information processing, and the program 1430 may be executed under the control of the processor 1410.

In addition, as shown in FIG14 , the network device 1400 may further include: a transceiver 1440 and an antenna 1450, etc.; wherein the functions of the above components are similar to those of the prior art and are not described in detail here. It is worth noting that the network device 1400 does not necessarily include all the components shown in FIG14 ; in addition, the network device 1400 may also include components not shown in FIG14 , which may refer to the prior art.

The embodiment of the present application also provides a terminal device, but the present application is not limited thereto and may also be other devices.

FIG15 is a schematic diagram of a terminal device according to an embodiment of the present application. As shown in FIG15 , the terminal device 1500 may include a processor 1510 and a memory 1520; the memory 1520 stores data and programs and is coupled to the processor 1510. It is worth noting that the figure is exemplary; other types of structures may also be used to supplement or replace the structure to implement telecommunication functions or other functions.

For example, the processor 1510 may be configured to execute a program to implement the data receiving method as described in the embodiment of the first aspect. For example, the processor 1510 may be configured to perform the following control: receiving first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell; when the first CORESET of the first target cell is not configured with a first TCI state pool, or when the first CORESET is configured with the first TCI state pool but the TCI state is not activated, receiving the PDCCH according to the first QCL assumption, or not receiving the PDCCH.

As shown in FIG15 , the terminal device 1500 may further include: a communication module 1530, an input unit 1540, a display 1550, and a power supply 1560. The functions of the above components are similar to those in the prior art and are not described in detail here. It is worth noting that the terminal device 1500 does not necessarily include all the components shown in FIG15 , and the above components are not necessary; in addition, the terminal device 1500 may also include components not shown in FIG15 , and reference may be made to the prior art.

An embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the program enables the terminal device to execute the data receiving method described in the embodiment of the first aspect.

An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the data receiving method described in the embodiment of the first aspect.

The embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the The program enables the terminal device to execute the data sending method described in the embodiment of the second aspect.

An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the data sending method described in the embodiment of the third aspect.

The above devices and methods of the present application can be implemented by hardware, or by hardware combined with software. The present application relates to such a computer-readable program, which, when executed by a logic component, enables the logic component to implement the above-mentioned devices or components, or enables the logic component to implement the various methods or steps described above. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

The method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams shown in the figure and/or one or more combinations of the functional block diagrams may correspond to various software modules of the computer program flow or to various hardware modules. These software modules may correspond to the various steps shown in the figure, respectively. These hardware modules may be implemented by solidifying these software modules, for example, using a field programmable gate array (FPGA).

The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in a memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if a device (such as a mobile terminal) uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

For one or more of the functional blocks described in the drawings and/or one or more combinations of functional blocks, it can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof for performing the functions described in the present application. For one or more of the functional blocks described in the drawings and/or one or more combinations of functional blocks, it can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

Regarding the implementation methods including the above embodiments, the following additional notes are also disclosed:

1. A data receiving method, applied to a terminal device, the method comprising:

Receiving first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell;

In a case where the first CORESET of the first target cell is not configured with the first TCI state pool, or in a case where the first CORESET is configured with the first TCI state pool but the TCI state in the first TCI state pool is not activated, PDCCH is received according to the first QCL assumption, or PDCCH is not received.

2. The method according to Note 1, wherein the first QCL assumption is determined based on the SSB of the first target cell and/or the first TCI state and/or the second TCI state indicated by the first indication information.

3. The method according to Note 1, wherein the first CORESET is a CORESET of the first target cell that does not follow the unified TCI state.

4. The method according to Note 1, wherein the situation in which the first CORESET is configured with the first TCI state pool but the TCI states in the first TCI state pool are not activated includes: the first CORESET is configured with the first TCI state pool including at least two TCI states but the TCI states in the first TCI state pool are not activated.

5. According to the method described in Note 1, the first indication information is a cell switch command.

6. The method according to Note 2, wherein the first QCL assumption includes at least one of the following:

Assume that the DMRS of the PDCCH is quasi-co-located with the SSB indicated by the second indication information (DCI);

Assume that the DMRS of the PDCCH and the terminal device are used to determine the SSB quasi-co-location of the first target cell TA;

Assume that the DMRS of the PDCCH is quasi-co-located with the SSB with the maximum L1-RSRP of the first target cell reported by the terminal device;

Assume that the DMRS of the PDCCH is quasi-co-located with the SSB indicated by the first indication information, wherein the indicated SSB is the SSB of the first target cell;

Assume that the DMRS of the PDCCH is quasi-co-located with the reference signal included in the first TCI state indicated by the first indication information;

It is assumed that the DMRS of the PDCCH is quasi-co-located with the reference signal included in the second TCI state indicated by the first indication information, wherein the second TCI state is the TCI state of the first target cell.

7. The method according to Supplement 6, wherein the method further comprises:

The second indication information is received before the first indication information is received, wherein the second indication information indicates a PDCCH order, and the PDCCH order indicates that the terminal device sends a PRACH to the first target cell.

8. The method according to Note 6, wherein the second TCI state and the first TCI state are from a second TCI state pool, wherein the second TCI state pool is the same as or different from the first TCI state pool; or, the second TCI state is from a third TCI state pool, and the first TCI state is from a fourth TCI state pool, wherein the third TCI state pool is the same as or different from the first TCI state pool, and the fourth TCI state pool is the same as or different from the first TCI state pool.

9. The method according to Note 3, wherein the first CORESET is a CORESET other than CORESET 0, wherein the first CORESET is associated with at least one CSS set other than the Type3-PDCCH CSS set.

10. The method according to Note 3, wherein the first CORESET is CORESET 0.

11. The method according to Note 1, wherein the method further comprises: receiving the PDSCH scheduled by the PDCCH according to the first QCL assumption.

12. The method according to Note 2, wherein the first indication information further indicates a second target cell;

In a case where the second CORESET of the second target cell is not configured with the fifth TCI state pool, or in a case where the second CORESET is configured with the fifth TCI state pool but the TCI state in the fifth TCI state pool is not activated, the PDCCH is received according to the first QCL assumption, or the PDCCH is received according to the second QCL assumption, or the PDCCH is not received.

13. The method according to Note 12, wherein the second CORESET is a CORESET of the second target cell that does not follow the unified TCI state.

14. The method according to Note 12, wherein the situation in which the second CORESET is configured with the fifth TCI state pool but the TCI states in the fifth TCI state pool are not activated includes: the second CORESET is configured with the fifth TCI state pool including at least two TCI states but the TCI states in the fifth TCI state pool are not activated.

15. The method according to Note 12, wherein the second target cell and the first target cell belong to the same simultaneous TCI update list, and/or the same cell group, and/or the same TA group, and/or the CORESET index of the second CORESET of the second target cell is the same as the CORESET index of the first CORESET of the first target cell.

16. The method according to Note 12, wherein the second QCL assumption is determined according to the SSB and/or the third TCI state of the second target cell,

The SSB of the second target cell in the second QCL hypothesis has the same index as the SSB of the first target cell in the first QCL hypothesis, and/or,

Among them, the third TCI state in the second QCL assumption has the same index as the first TCI state or the second TCI state in the first QCI assumption.

17. The method according to Note 15, wherein the third TCI state is a TCI state in the fifth TCI state pool.

18. The method according to Note 3, wherein the method further comprises:

In a case where the first TCI state pool is configured and the TCI state in the first TCI state pool is activated before receiving the first indication information, the PDCCH is received based on the assumption that the DMRS of the PDCCH is quasi-co-located with the activated TCI state in the first TCI state pool.

19. The method according to Note 1, wherein the method further comprises:

In case the first CORESET is configured as a CORESET following a unified TCI state in the candidate cell configuration, the PDCCH is received based on the assumption that the DMRS of the PDCCH is quasi-co-located with the first TCI state.

20. The method according to Note 1, wherein the method further comprises:

The first CORESET is configured with the first TCI state in the candidate cell configuration.

In the case of TCI state pool, the PDCCH is received based on the assumption that the DMRS of the PDCCH is quasi-co-located with the one TCI state.

21. The method according to Notes 1 to 20, wherein:

The first target cell is a non-serving cell, and/or the second target cell is a non-serving cell.

22. A data transmission method, applied to a network device, the method comprising:

Sending first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell;

A PDCCH is sent, wherein, when the first CORESET of the first target cell is not configured with the first TCI state pool, or when the first CORESET is configured with the first TCI state pool but the TCI state in the first TCI state pool is not activated, the terminal device receives the PDCCH according to the first QCL assumption, or does not receive the PDCCH.

23. The method according to Note 22, wherein the method further comprises:

Second indication information is sent before sending the first indication information, wherein the second indication information indicates a PDCCH order, and the PDCCH order instructs the terminal device to send a PRACH to the first target cell.

24. The method according to Note 22, wherein the method further comprises: the PDCCH scheduling PDSCH or PUSCH.

25. A terminal device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the method as described in any one of Notes 1 to 21.

26. A network device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the method as described in any one of Notes 22 to 24.

27. A communication system comprising:

A network device that sends first indication information;

A terminal device receives first indication information, wherein the first indication information indicates a first target cell and a first TCI state of the first target cell;

In a case where the first CORESET of the first target cell is not configured with the first TCI state pool, or in a case where the first CORESET is configured with the first TCI state pool but the TCI state in the first TCI state pool is not activated, PDCCH is received according to the first QCL assumption, or PDCCH is not received.

Claims (20)

A data receiving device, configured in a terminal device, wherein the data receiving device comprises: A first receiving unit, which receives first indication information, wherein the first indication information indicates a first target cell and a first transmission configuration indication state (TCI state) of the first target cell; A second receiving unit, which receives a physical downlink control channel (PDCCH) according to a first quasi-co-location (QCL) assumption, or does not receive the physical downlink control channel (PDCCH), when the first control resource set (CORESET) of the first target cell is not configured with the first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) is not activated. The device according to claim 1, wherein the first quasi-co-location (QCL) assumption is determined based on a synchronization information block (SSB) of the first target cell and/or the first transmission configuration indication state (TCI state) and/or a second transmission configuration indication state (TCI state) indicated by the first indication information. The device according to claim 1, wherein the first control resource set (CORESET) is a control resource set (CORESET) of the first target cell that does not follow a unified transmission configuration indication state (unified TCI state). The device according to claim 1, wherein the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated, comprising: the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) including at least two transmission configuration indication states (TCI state) but the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is not activated. The apparatus according to claim 1, wherein the first indication information is a cell switching command. The apparatus of claim 2, wherein the first quasi co-location (QCL) assumption comprises at least one of the following: Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) indicated by the second indication information; Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) used by the terminal device to determine a timing advance (TA) of the first target cell; Assume that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) with the maximum layer 1-reference signal received power (L1-RSRP) of the first target cell reported by the terminal device; Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a synchronization information block (SSB) indicated by the first indication information, wherein the indicated synchronization information block (SSB) is a synchronization information block (SSB) of the first target cell; Assuming that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) and a reference signal included in the first transmission configuration indication state (TCI state) indicated by the first indication information are quasi-co-located; It is assumed that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with a reference signal included in a second transmission configuration indication state (TCI state) indicated by the first indication information, wherein the second transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) of the first target cell. The device according to claim 6, wherein the first receiving unit receives the second indication information before receiving the first indication information, wherein the second indication information indicates a physical downlink control channel order (PDCCH order), and the physical downlink control channel order (PDCCH order) instructs the terminal device to send a physical random access channel (PRACH) to the first target cell. The device according to claim 6, wherein the second transmission configuration indication state (TCI state) and the first transmission configuration indication state (TCI state) are from a second transmission configuration indication state pool (TCI state pool), wherein the second transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool); or, the second transmission configuration indication state (TCI state) is from a third transmission configuration indication state pool (TCI state pool), and the first transmission configuration indication state (TCI state) is from a fourth transmission configuration indication state pool (TCI state pool), wherein the third transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool), and the fourth transmission configuration indication state pool (TCI state pool) is the same as or different from the first transmission configuration indication state pool (TCI state pool). The apparatus according to claim 3, wherein the first control resource set (CORESET) is a control resource set (CORESET) other than control resource set 0 (CORESET0), wherein the first control resource set (CORESET) is associated with at least one common search space set (CSS set) other than a type 3 physical downlink control channel common search space set (Type3-PDCCH CSS set). The apparatus of claim 3, wherein the first control resource set (CORESET) is control resource set 0 (CORESET0). The apparatus according to claim 2, wherein the first indication information further indicates a second target cell; In a case where the second control resource set (CORESET) of the second target cell is not configured with the fifth transmission configuration indication state pool (TCI state pool), or in a case where the second control resource set (CORESET) is configured with the fifth transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool) is not activated, a physical downlink control channel (PDCCH) is received according to the first quasi co-location (QCL) assumption, or, a physical downlink control channel (PDCCH) is received according to the second quasi co-location (QCL) assumption, or, a physical downlink control channel (PDCCH) is not received. The device according to claim 11, wherein the second control resource set (CORESET) is a control resource set (CORESET) of the second target cell that does not follow a unified transmission configuration indication state (unified TCI state). The device according to claim 11, wherein the second control resource set (CORESET) is configured with the fifth transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool) is not activated, including: the second control resource set (CORESET) is configured with the fifth transmission configuration indication state pool (TCI state pool) including at least two transmission configuration indication states (TCI state) but the transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool) is not activated. The device according to claim 11, wherein the second target cell and the first target cell belong to the same simultaneous transmission configuration indication state (TCI state) update list, and/or the same cell group (cell group), and/or the same time advance group (TA group), and/or the control resource set (CORESET) index of the second control resource set (CORESET) of the second target cell is the same as the control resource set (CORESET) index of the first control resource set (CORESET) of the first target cell. The apparatus according to claim 11, wherein the second quasi co-location (QCL) assumption is determined according to a synchronization information block (SSB) and/or a third transmission configuration indication state (TCI state) of the second target cell, wherein a synchronization information block (SSB) of the second target cell in the second quasi co-location (QCL) assumption has the same index as a synchronization information block (SSB) of the first target cell in the first quasi co-location (QCL) assumption, and/or, Among them, the third transmission configuration indication state (TCI state) in the second quasi co-location (QCL) assumption has the same index as the first transmission configuration indication state (TCI state) or the second transmission configuration indication state (TCI state) in the first quasi co-location (QCL) assumption. The device according to claim 15, wherein the third transmission configuration indication state (TCI state) is a transmission configuration indication state (TCI state) in the fifth transmission configuration indication state pool (TCI state pool). The device according to claim 3, wherein, when the second receiving unit is configured with the first transmission configuration indication state pool (TCI state pool) and the transmission configuration indication state (TCI state) in the first transmission configuration indication state pool (TCI state pool) is activated before receiving the first indication information, the physical downlink control channel (PDCCH) is received based on the assumption that the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the transmission configuration indication state (TCI state) in the activated first transmission configuration indication state pool (TCI state pool). The device according to claim 1, wherein the second receiving unit receives the physical downlink control channel (PDCCH) based on the assumption that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the first transmission configuration indication state (TCI state) when the first control resource set (CORESET) is configured as a control resource set (CORESET) that follows a unified transmission configuration indication state (unified TCI state) in the candidate cell configuration. The device according to claim 1, wherein, when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) including a transmission configuration indication state (TCI state) in the candidate cell configuration, the physical downlink control channel (PDCCH) is received based on the assumption that a demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) is quasi-co-located with the one transmission configuration indication state (TCI state). A data sending device, configured in a network device, comprising: A first sending unit, which sends first indication information, wherein the first indication information indicates a first target cell and a first transmission configuration indication state (TCI state) of the first target cell; A second sending unit, which sends a physical downlink control channel (PDCCH); Among them, when the first control resource set (CORESET) of the first target cell is not configured with the first transmission configuration indication state pool (TCI state pool), or when the first control resource set (CORESET) is configured with the first transmission configuration indication state pool (TCI state pool) but the transmission configuration indication state (TCI state) is not activated, the terminal device receives the physical downlink control channel (PDCCH) according to the first quasi-co-location (QCL) assumption, or does not receive the physical downlink control channel (PDCCH).