CN115915296A

CN115915296A - Cell switching method, device, user equipment and storage medium

Info

Publication number: CN115915296A
Application number: CN202110904553.XA
Authority: CN
Inventors: 王臣玺; 孙鹏; 杨宇
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2023-04-04
Also published as: WO2023011545A1

Abstract

The application discloses a cell switching method, a device, user equipment and a storage medium, which belong to the technical field of communication, and the cell switching method of the embodiment of the application comprises the following steps: the UE performs transmission mode switching on the target cell according to the target indication information; wherein the target indication information is used for indicating a target unified TCI state, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

Description

Cell switching method, device, user equipment and storage medium

Technical Field

The present application belongs to the field of communications technologies, and in particular, to a cell switching method, apparatus, user equipment, and storage medium.

Background

In order to improve the efficiency of beam management, a Transmission Configuration Indication (TCI) mechanism is introduced. In a Carrier Aggregation (CA) scenario, multiple Carrier units (CCs) may share a unified TCI status pool. When performing cell handover, the network side device needs to send an RRC reconfiguration signaling to instruct the UE to perform handover, so that there are problems of long cell handover delay and poor flexibility.

Disclosure of Invention

The embodiment of the application provides a cell switching method, a cell switching device, user equipment and a storage medium, and can solve the problems of long cell switching time delay and poor flexibility in a CA (cell access) scene.

In a first aspect, a cell handover method is provided, where the cell handover method includes: the UE performs transmission mode switching on the target cell according to the target indication information; wherein the target indication information is used for indicating a target unified TCI state, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

In a second aspect, a cell switching apparatus is provided, which includes: and executing the module. The execution module is used for executing the switching of the transmission mode to the target cell according to the target indication information; wherein the target indication information is used for indicating a target unified TCI state, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

In a third aspect, a UE is provided, comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the method according to the first aspect.

In a fourth aspect, a UE is provided, which includes a processor and a communication interface, where the processor is configured to perform a handover of a transmission scheme to a target cell according to target indication information; wherein the target indication information is used for indicating a target unified TCI state, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

In a fifth aspect, there is provided a readable storage medium on which a program or instructions are stored, which program or instructions, when executed by a processor, implement the steps of the method according to the first aspect.

In a sixth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a program or instructions to implement the method according to the first aspect.

In a seventh aspect, there is provided a computer program/program product stored in a non-transitory storage medium, the program/program product being executed by at least one processor to implement the steps of the cell handover method according to the first aspect.

In the embodiment of the present application, the UE performs transmission mode switching on a target cell according to target indication information, where the target indication information is used to indicate a target unified TCI state, and the target cell includes a first cell and/or a second cell corresponding to the UE. In the scheme, in a CA (conditional access) scene, the UE can switch transmission modes to the target cell according to the indication information of the target unified TCI state so as to realize the rapid switching of the cell, and compared with the traditional method that the network explicitly sends RRC reconfiguration signaling to inform the UE of cell switching, the method and the system improve the flexibility of the system, reduce the time delay of cell switching and improve the flexibility of cell switching.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a cell handover method according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a cell switching apparatus according to an embodiment of the present application;

fig. 4 is a schematic hardware structure diagram of a communication device according to an embodiment of the present application;

fig. 5 is a schematic hardware structure diagram of a UE according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be described below clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally used herein in a generic sense to distinguish one element from another, and not necessarily from another element, such as a first element which may be one or more than one. In addition, "and/or" in the specification and the claims means at least one of connected objects, and a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

It is noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE)/LTE-advanced (LTE-a) systems, but may also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single-Carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably in embodiments of the present application, and the described techniques may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for exemplary purposes and NR terminology is used in much of the description below, but the techniques may also be applied to applications other than NR system applications, such as 6th generation (6 g) communication systems.

Fig. 1 is a schematic diagram illustrating an architecture of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes UE 11 and network-side device 12. Wherein, the UE 11 may also be referred to as a terminal DEVICE or a terminal, the UE 11 may be a Mobile phone, a tablet Computer (tablet Computer), a laptop Computer (laptop Computer) or a terminal-side DEVICE called a notebook Computer, a Personal Digital Assistant (PDA), a palm top Computer, a netbook, a super Mobile Personal Computer (UMPC), a Mobile INTERNET DEVICE (Mobile INTERNET dev, MID), a wearable DEVICE (wearable DEVICE) or a vehicle-mounted DEVICE (VUE), a pedestrian terminal (PUE), and the like, and the wearable DEVICE includes: smart watches, bracelets, earphones, glasses, and the like. It should be noted that the embodiment of the present application does not limit the specific type of the UE 11. The network-side device 12 may be a Base Station or a core network, where the Base Station may be referred to as a node B, an evolved node B, an access Point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a WLAN access Point, a WiFi node, a Transmit Receiving Point (TRP), or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present application, only the Base Station in the NR system is taken as an example, but a specific type of the Base Station is not limited.

The following explains some concepts and/or terms involved in a cell handover method, apparatus, user equipment and storage medium provided in the embodiments of the present application.

1. Beam measurement and reporting (Beam measurement and Beam reporting)

Analog beamforming is full bandwidth transmit and each polar array element on the panel of each high frequency antenna array can only transmit analog beams in a time division multiplexed manner. The shaping weight of the analog wave beam is realized by adjusting the parameters of the radio frequency front end phase shifter and other devices.

At present, a polling method is usually used to train an analog beamforming vector, that is, an array element in each polarization direction of each antenna panel sequentially sends a training signal (i.e., a candidate beamforming vector) at an appointed time in a time division multiplexing manner, and a terminal feeds back a beam report after measurement, so that a network side uses the training signal to implement analog beamforming transmission when transmitting a service next time. The contents of the beam report typically include the optimal number of transmit beam identifications and the measured received power of each transmit beam.

In beam measurement, the network configures a set of reference signal resources (RS resource set) including at least one reference signal resource, such as SSB resource or CSI-RS resource. And the UE measures the L1-RSRP/L1-SINR of each RS resource and reports at least one optimal measurement result to the network, wherein the reported content comprises SSBRI or CRI and L1-RSRP/L1-SINR. The report content reflects at least one optimal beam and its quality for the network to determine the beam used to transmit the channel or signal to the UE.

2. Mechanism relating to beam indication (beam indication)

After the beam measurement and the beam report, the network may perform beam indication on the downlink and uplink channels or reference signals, so as to establish a beam link between the network and the UE, and implement transmission of the channels or the reference signals.

For the beam Indication of the PDCCH, the network configures K TCI (Transmission Configuration Indication) states for each core set using RRC signaling, and when K >1, 1 TCI state is indicated or activated by the MAC CE, and when K =1, no additional MAC CE command is required. When monitoring the PDCCH, the UE monitors the PDCCH using the same QCL (Quasi-co-location), i.e. the same TCI state, for all search spaces in the CORESET. The referral signal (e.g., periodic CSI-RS resource, semi-persistent CSI-RS resource, SS block, etc.) in this TCI state is spatial QCL with the UE-specific PDCCH DMRS port. The UE can know which receiving beam is used to receive the PDCCH according to the TCI status.

For beam indication of the PDSCH, the network configures M TCI states through RRC signaling, then activates 2N TCI states through MAC CE commands, and then informs the TCI state through an N-bit TCI field of the DCI, wherein a referrenceSignal in the TCI state and a DMRS port of the PDSCH to be scheduled are QCL. The UE can know which receiving beam is used to receive the PDSCH according to the TCI status.

For the beam indication of the CSI-RS, when the CSI-RS type is periodic CSI-RS, the network configures QCL information for CSI-RS resource through RRC signaling. When the CSI-RS type is semi-persistent CSI-RS, the network indicates QCL information thereof when activating one CSI-RS resource from RRC-configured CSI-RS resource sets through a MAC CE command. When the CSI-RS type is aperiodic CSI-RS, the network configures QCL for CSI-RS resource through RRC signaling and uses DCI to trigger CSI-RS.

For the beam indication of the PUCCH, the network configures a spatial relationship information for each PUCCH resource by using RRC signaling through a parameter PUCCH-spatial relationship information, and when the configured spatial relationship information for the PUCCH resource comprises a plurality of information, one of the spatial relationship information is indicated or activated by using MAC-CE. When the spatial relationship information configured for PUCCH resource contains only 1, no additional MAC CE command is required.

For the beam indication of the PUSCH, the spatial relationship information of the PUSCH is that when DCI carried by the PDCCH schedules the PUSCH, each SRI code of the SRI field in the DCI indicates one SRI, and the SRI is used for indicating the spatial relationship information of the PUSCH.

For the beam indication of the SRS, when the SRS type is periodic SRS, the network configures a spatial relationship information for SRS resource through RRC signaling. When the SRS type is semi-persistent SRS, the network activates one from a set of spatial relationship information configured by RRC through a MAC CE command. When the SRS type is the aperiodic SRS, the network configures the spatial relationship information for the SRS resource through RRC signaling.

The beam information, the spatial relationship information, the spatial domain transmission filter information, the spatial filter information, the TCI state information, the QCL parameter, the spatial relationship information, and the like are approximately the same. The downlink beam information may be generally represented by TCI state information and QCL information. The uplink beam information can be generally expressed using spatial relationship information.

3. Unified TCI framework

In order to improve the efficiency of beam management and reduce the beam updating time delay, a unified TCI framework design is introduced. At present, there are two schemes, one is join TC, that is, uplink and downlink use one beam uniformly. When the DCI indicates a TCI state, all channels and/or signals of the uplink and downlink apply the TCI state. Another solution is that the DCI indicates a pair of beams, i.e. two TCI states, called pair TCI, one for all downlink channels or signals and one for all uplink channels or signals.

Currently, for the case of intra-band CA, it is agreed that multiple CCs may share a Unified TCI state pool (Unified TCI state pool), and the sharing method includes the following two ways:

defining a reference BWP/CC, and taking a QCL Type resource RS corresponding to a unified TCI state (unified TCI state) indicated by the DCI in the reference BWP/CC as a unified TCI state of all CCs or BWPs;

and the RS on each BWP/CC corresponding to the QCL Type Resource ID in the unified TCI state indicated by the DCI is taken as the unified TCI state on the respective BWP/CC.

4. RRM measurements

In the existing RRM measurement, the UE measures the reference signal of the neighboring cell, and determines whether to perform cell handover. To avoid short-term fluctuations in the measurement results, it is common to average a series of evenly distributed measurement samples over the measurement period, which may be referred to as a high-level (e.g., level 3. The L3 measurement is obtained by performing L3 filtering based on the L1 measurement result.

When measuring the reference signal SSB of the neighboring cell, a measurement window needs to be set to measure the timing of the SSB, that is, the SMTC needs to be set to avoid unnecessary measurement, so as to reduce the energy loss of the measurement. The period of the SMTC window may be set to be the same as SSBs, e.g., 5/10/20/40/80/160ms, etc., and the time interval for measurement may be set to be 1/2/3/4/5ms, etc., depending on the number of SSBs transmitted. The UE measures the SSB according to the SMTC configuration information, and then reports the measurement result to the gNB or performs cell selection.

SMTC is collectively referred to as: synchronization signal/physical broadcast channel block measurement timing configuration (SS/PBCH block measurement configuration).

5. Rate matching

When L1 measures the SSB of the cell, there is a rate matching mechanism, that is, the PDSCH cannot be transmitted on the PRB of the SSB.

In a non-CA mobile scenario, the time-frequency domain locations of SSBs on different CCs are different, so a rate matching pattern (rate pattern) is determined according to SSB resource allocation on different CCs, which is specifically as follows:

if the PDSCH is from the resource CC, using a rate matching mode on the resource CC;

if the PDSCH is from the target CC, then the rate matching mode on the target CC is used.

The cell handover method provided by the embodiments of the present application is described in detail below with reference to the accompanying drawings by using some embodiments and application scenarios thereof.

At present, a network side needs to display an RRC reconfiguration signaling to indicate that the UE is switched, which is long in delay and not flexible enough. In addition, when a plurality of CCs share a unified TCI state pool in a CA scenario, the layer 1 (L1) based beam switching has the problems of cell switching state confusion and rate mismatch. At present, the L1-based cell handover and rate matching in the CA scenario are not favorable for mobility management, including cell handover, inter-cell multi-TRP, and the like.

The embodiment of the application provides a method for switching the cell and the rate matching mode based on L1 in a CA scene, compared with the traditional method that the network explicitly sends RRC reconfiguration signaling to inform UE of cell switching, the flexibility of the system is improved, and the cell switching time delay is reduced.

An embodiment of the present application provides a cell handover method, and fig. 2 shows a flowchart of the cell handover method provided in the embodiment of the present application. As shown in fig. 2, a cell handover method provided in an embodiment of the present application may include

steps

201 and 202 described below.

Step 201, the UE obtains target indication information.

Step 202, the UE performs transmission mode switching on the target cell according to the target indication information.

In this embodiment of the present application, the target indication information is used to indicate a target unified TCI status, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

It should be noted that the cell handover method provided in the embodiment of the present application, that is, the handover method applied in the CA scenario, is also applicable to TRP handover between cells, that is, a first cell and a second cell are replaced by a first TRP and a second TRP.

In this embodiment, the UE may determine the unified TCI status of the target cell according to target unified TCI status information (for example, a target unified TCI status identifier) included in the target indication information, and determine the cell where the PCI is switched according to the unified TCI status of the target cell, so as to perform switching of the transmission mode on the cell where the PCI is switched.

Optionally, in this embodiment of the present application, the target indication information may be sent by a network side device, or may also be agreed by a protocol, or may also be preconfigured, or may also be decided autonomously by the UE.

Optionally, in this embodiment of the present application, the first cell is a primary cell, and the second cell is a secondary cell.

Optionally, in an embodiment of the present application, the transmission manner includes at least one of the following: unified TCI status, rate matching mode.

Optionally, in this embodiment of the application, the target indication information is any one of the following: DCI, MAC CE signaling, RRC signaling.

Optionally, in this embodiment of the application, the target indication information is further used to indicate a source cell or a source TRP corresponding to the unified TCI state.

Optionally, in this embodiment of the present application, the unified TCI status is a unified TCI status in a unified TCI status pool; the unified TCI status pool is a unified TCI status pool shared by the first information in the third cell.

Optionally, in an embodiment of the present application, the third cell includes at least one of: the method comprises the steps of a first cell, a second cell, all cells in a carrier component CC list configured by a network, adjacent cells of the first cell, adjacent cells of the second cell and adjacent cells of all cells in the CC list configured by the network.

Optionally, in an embodiment of the present application, the first information includes at least one of: reference signal RS, control channel, data channel.

Alternatively, in this embodiment of the present application, the step 202 may be specifically implemented by the following steps 202a to 202 c.

Step 202a, the UE determines a first unified TCI state of the target cell according to the target indication information.

Alternatively, in this embodiment of the application, the step 202a may be specifically implemented by the following step 202a1 and step 202a 2.

Step 202a1, the UE determines, according to a first preset rule, one QCL type resource RS identifier in the target unified TCI state as a target RS identifier.

Step 202a2, the UE determines the first RS as a first unified TCI state of the target cell.

In this embodiment, the first RS is an RS corresponding to a target RS identifier in a target cell.

It should be noted that, the quasi co-located source reference signal corresponding to the first unified TCI state of the target cell is an RS corresponding to a target RS identifier in the target cell, and the first unified TCI state of the target cell may be understood as a candidate unified TCI state, which is not yet used for data reception.

Step 202b, the UE determines the cell where the PCI handover occurs according to the first unified TCI status of the target cell.

Alternatively, in this embodiment of the present application, the step 202b may be specifically implemented by the following step 202b1 or step 202b 2.

Step 202b1, when the target cell includes a fourth cell and the first unified TCI status of the fourth cell satisfies the first condition, the UE determines that the fourth cell is a cell where PCI is switched, and the fourth cell is the first cell or the second cell.

Step 202b2, in a case that the target cell includes the first cell and the second cell, and a first joint TCI state of a fifth cell in the target cell satisfies a first condition, the UE determines that the fifth cell is a cell where the PCI handover occurs, where the fifth cell includes at least one of: a first cell and the second cell.

In an embodiment of the present application, the first condition is any one of:

a first RS corresponding to a first unified TCI state of a target cell belongs to a neighbor cell of the target cell;

a quasi co-location QCL resource RS of a first RS corresponding to a first unified TCI state of a target cell is adjacent to the target cell;

the first unified TCI state of the target cell carries the PCI of the neighbor cell of the target cell or the indication of the neighbor cell association information of the target cell;

the TCI state of the first RS corresponding to the first unified TCI state of the target cell carries the PCI of the neighbor cell of the target cell or an indication of neighbor cell association information of the target cell.

In the case of executing the step 202b1, the first condition is specifically any one of the following:

a first RS corresponding to the first unified TCI state of the fourth cell belongs to an adjacent cell of the fourth cell;

a quasi co-located QCL resource RS of the first RS corresponding to the first unified TCI state of the fourth cell is a neighbor cell of the fourth cell;

the first unified TCI status of the fourth cell carries the PCI of the neighbor cell of the fourth cell, or an indication of neighbor cell association information of the fourth cell;

the TCI status of the first RS corresponding to the first unified TCI status of the fourth cell carries the PCI of the neighboring cell of the fourth cell or an indication of the neighboring cell association information of the fourth cell.

In the case of executing the step 202b2, the first condition is specifically any one of the following:

a first RS corresponding to the first unified TCI state of the fifth cell belongs to an adjacent cell of the fifth cell;

a quasi co-located QCL resource RS of the first RS corresponding to the first unified TCI state of the fifth cell is a neighbor cell of the fifth cell;

the first unified TCI status of the fifth cell carries the PCI of the neighboring cell of the fifth cell, or an indication of the neighboring cell association information of the fifth cell;

the TCI state of the first RS corresponding to the first unified TCI state of the fifth cell carries the PCI of the neighboring cell of the fifth cell or an indication of the neighboring cell association information of the fifth cell.

Optionally, in this embodiment of the present application, the indication of the neighboring cell association information is used to determine neighboring cell association information; the neighbor cell association information includes at least one of: the period of the RS of the adjacent cell, the time domain position of the RS of the adjacent cell, the sending power of the RS of the adjacent cell and the PCI of the adjacent cell.

Step 202c, the UE performs the switching of the transmission mode for the cell where the PCI switching occurs.

Alternatively, in this embodiment of the present application, the step 202c may be specifically implemented by the following step 202c 1.

Step 202c1, the UE determines that the second unified TCI status of the target cell is the first unified TCI status of the target cell, if the third condition is satisfied.

In an embodiment of the present application, the third condition includes at least one of:

a first RS corresponding to the first unified TCI state of the target cell and RSs corresponding to the unified TCI states of other cells except the target cell belong to different cells;

the PCI carried by the first unified TCI state of the target cell is different from the PCI carried by the unified TCI states of other cells except the target cell;

the PCI or neighbor cell related information indication carried by the TCI state of the first RS corresponding to the first unified TCI state of the target cell is different from the PCI or neighbor cell related information indication carried by the TCI state of the RS corresponding to the unified TCI state of other cells except the target cell.

It should be noted that the second unified TCI state of the target cell can be understood as a unified TCI state to be applied to data reception or already used for data reception.

In addition, when the target cell determines that the PCI handover does not occur in the target cell according to the first unified TCI state of the target cell indicated by the target unified TCI state, the UE may determine or update the second unified TCI state of the target cell to the first unified TCI state of the target cell.

Optionally, in this embodiment of the present application, the second unified TCI status of the target cell is any one of the following:

unified TCI state of part channels and/or RS in the target cell;

unified TCI status for all channels and/or RSs in the target cell.

Alternatively, in this embodiment of the application, the step 202c may be specifically implemented by the following step 202c 2.

Step 202c2, under the condition that the first unified TCI state of the target cell meets the third condition, the UE performs the switching of the rate matching mode to the cell where the PCI switching occurs.

It should be noted that, for a carrier aggregation or a scenario with multiple TRPs between cells, when the PCI handover occurs in the primary cell but the PCI handover does not occur in the secondary cell, the rate matching mode of the secondary cell changes according to the handover of the rate matching mode of the primary cell.

Optionally, in this embodiment of the present application, the first cell and the second cell are respectively configured with a plurality of rate matching modes;

the method comprises the following steps that a plurality of rate matching modes are associated with a plurality of PCIs, and each rate matching mode corresponds to one PCI;

the plurality of rate matching patterns are associated with RS configuration information of a plurality of neighbor cells.

Optionally, in this embodiment of the present application, the rate matching mode of the target cell is determined by a second preset rule;

the second preset rule is at least one of the following:

correlating the rate matching mode of the PCI before switching;

correlating the switched PCI rate matching mode;

and the rate matching mode is determined according to the data scheduling conditions of other cells except the target cell.

Alternatively, in this embodiment of the present application, the step 202c may be specifically implemented by the following step 202c 3.

Step 202c3, under the condition that the fourth condition is met, the UE reverts to the single carrier scheduling state, determines the serving cell according to a third preset rule, deactivates other cells in the CC list, and determines that the second unified TCI state of the serving cell is the first unified TCI state of the serving cell.

In an embodiment of the present invention, the serving cell is a first cell or a second cell.

Wherein the fourth condition includes at least one of:

a first RS corresponding to the first unified TCI state of the target cell and an RS corresponding to the unified TCI state of at least one other cell except the target cell belong to the same cell;

the PCI carried by the first unified TCI state of the target cell is the same as the PCI carried by the unified TCI state of at least one other cell other than the target cell.

Optionally, in this embodiment of the application, the second unified TCI status of the serving cell is any one of:

unified TCI status of partial channels and/or RSs in a serving cell;

unified TCI status for all channels and/or RSs in the serving cell.

Optionally, in this embodiment of the present application, the rate matching mode of the serving cell is determined by a PCI associated with scheduling and transmission of a PDSCH;

dispatching the PCI before switching corresponding to the transmission associated service cell by the PDSCH, and determining a rate matching mode according to the RS resource configuration associated with the PCI before switching;

and dispatching the switched PCI corresponding to the transmission associated service cell by the PDSCH, and determining a rate matching mode according to the RS resource configuration associated with the switched PCI.

The cell handover method provided in the embodiment of the present application is described below through a specific procedure.

In the embodiment of the present application, in a CA scenario, based on L1 cell handover, a UE may perform transmission mode handover according to indication information (i.e., target indication information) of a network side. The specific process is as follows:

and the UE receives indication information of a network side in the first cell, wherein the indication information is used for indicating the PCI switching of the first cell and/or the second cell and the transmission mode after the PCI switching.

Optionally, in this embodiment of the application, the indication information may be signaling information carrying an indication of a unified TCI state (unified TCI state).

Optionally, in this embodiment of the present application, the signaling information may be DCI, MAC CE, RRC, or the like.

Optionally, in this embodiment of the application, the signaling information may further include an indication of a source cell/TRP corresponding to the unified TCI state, for example, a PCI of the source cell, a bitmap indication, or a control resource Pool index (CORESET Pool index). It should be noted that the scheme may be directed to a scenario in which a unified TCI status is indicated across carriers.

Optionally, in this embodiment, the PCI handover refers to a conversion from sending by the source cell/TRP to sending by the target cell/TRP of part or all of the data received by the UE. Specifically, it can be understood that the unified TCI status of all or part of the data channels or the control channels is determined according to the indication of the unified TCI status in the indication information, and the RS with the unified TCI status directly associated or indirectly associated belongs to the neighboring cell.

Optionally, in this embodiment of the present application, the transmission mode after the PCI switching includes at least one of the following:

a unified TCI status on the first cell and/or the second cell;

rate matching patterns (rate matching patterns) on the first cell and/or the second cell.

Optionally, in this embodiment of the present application, the first cell may be a primary cell or a secondary cell.

Optionally, in this embodiment of the application, the unified TCI state is one unified TCI state in a unified TCI state pool (unified TCI state pool).

Optionally, in this embodiment of the present application, the unified TCI status includes at least one of the following:

QCL Type A resource RS ID；

QCL Type B resource RS ID；

QCL Type C resource RS ID；

QCL Type D resource RS ID。

optionally, in this embodiment of the present application, the first information in the third cell may share the unified TCI status pool, that is, the unified TCI statuses of the first information in the third cell all come from the same unified TCI status pool.

Optionally, in this embodiment of the application, the first information is at least one of an RS, a control channel, or a data channel.

Optionally, in this embodiment of the present application, the first information may correspond to one or more unified TCI states, for example, for data transmission channels (PDCCH, PDSCH, PUCCH, PUSCH), the unified TCI states of all uplink and/or downlink channels are the same; for RSs, the concept of unified TCI may not be followed, i.e., different uplink and/or downlink RSs may correspond to different TCI states.

Optionally, in this embodiment of the present application, the third cell may include at least one of the following:

a first cell;

a second cell;

all cells in the network configured CC list;

a neighbor cell of the first cell;

a neighbor cell of the second cell;

and neighbor cells of all cells in the CC list configured by the network.

In the embodiment of the application, after the UE determines that the indication information is the first indication information, the PCI switching is performed.

Optionally, in this embodiment of the present application, the first indication information is an adjacent cell of which a unified TCI status carried in the signaling information belongs to the fourth cell.

Optionally, in this embodiment of the application, the fourth cell is the first cell or the second cell.

Optionally, in this embodiment of the application, the UE determines that the unified TCI state belongs to a neighboring cell of the fourth cell when the unified TCI state satisfies any of the following conditions:

in the unified TCI state, at least one QCL type RS ID or all RSs in the fourth cell indicated by the QCL type RS ID belong to neighbor cells of the fourth cell;

or, at least one QCL type RS ID in the unified TCI state or QCL resource RS of RSs in the fourth cell indicated by all QCL type RS IDs belong to neighbor cells of the fourth cell;

or the unified TCI state carries the PCI of the neighboring cell of the fourth cell, or an indication of the neighboring cell association information of the fourth cell;

or the TCI state of the RS in the fourth cell corresponding to at least one QCL type RS ID or all QCL type RS IDs in the unified TCI state carries the PCI of the neighboring cell of the fourth cell or the indication of the neighboring cell association information of the fourth cell.

Optionally, in this embodiment of the present application, the indication of the neighboring cell association information may determine the neighboring cell association information in a bit mapping manner.

Optionally, in this embodiment of the present application, the neighbor cell association information includes at least one of the following:

the period of the neighbor cell RS;

time domain position of the RS of the adjacent cell;

the transmission power of the RS of the adjacent cell;

the physical cell identity PCI of the neighbor cell.

In this embodiment, the UE may determine the unified TCI status of the first cell and/or the second cell according to the first indication information.

The UE determines a cell with PCI switching according to the first indication information, and the specific method comprises the following steps:

according to a preset rule, determining a QCL type resource RS ID in a unified TCI state indicated in signaling information as a target RS ID, such as a QCL type A RS ID;

the UE considers the PCI handover to occur for the fourth cell if the following conditions are met: the RS corresponding to the target RS ID in the fourth cell belongs to the adjacent cell, or the TCI state of the RS corresponding to the target RS ID in the fourth cell carries the PCI of the adjacent cell or the adjacent cell association information indication.

Optionally, in this embodiment of the present application, when the first condition is satisfied, the unified TCI state of the cell where the PCI handover occurs is the unified TCI state in the first indication information.

Wherein the first condition comprises at least one of:

at least one cell is subjected to PCI switching;

the RS corresponding to the unified TCI state in the first indication information on different cells corresponds to different cells;

and associating TC states of the RSs corresponding to the unified TCI states in the first indication information on different cells with different cells.

Optionally, in this embodiment of the present application, the unified TCI status of the cell where the PCI handover occurs refers to any one of the following situations:

unified TCI state of partial channels and/or RS in the cell where PCI switching occurs;

unified TCI status for all channels and/or RSs in the cell where PCI handover occurs.

Optionally, in this embodiment of the present application, when the fourth condition is met, the UE falls back to the single carrier scheduling state, determines the serving cell according to a preset rule, and deactivates other cells in the CC list, where the unified TCI state in the first indication information is the unified TCI state of the serving cell.

Wherein the fourth condition includes at least one of:

part or all RSs corresponding to the unified TCI state in the first indication information on different cells correspond to the same cell;

and associating the same cells with the TC states of part or all RSs corresponding to the unified TCI state in the first indication information on different cells.

It should be noted that all RSs corresponding to the target RS ID in all cells are associated with the same PCI, or the TCI states of all RSs carry the same PCI of the neighboring cell, or the TCI states of all RSs carry the same indication of neighboring cell association information;

all RSs corresponding to all QCL type resource RS IDs in the unified TCIs in all cells are associated with the same PCI, or the TCI states of all RSs carry the same PCI of the neighbor cells, or the TCI states of all RSs carry the same neighbor cell association information indication.

Optionally, in this embodiment of the present application, the unified TCI status of the serving cell refers to any one of the following situations:

unified TCI state of partial channels and/or RS in the serving cell;

unified TCI status for all channels and/or RSs in the serving cell;

and the UE determines the rate matching mode of the first cell and/or the second cell according to the first indication information.

Optionally, in this embodiment of the present application, a plurality of rate matching modes are configured in the first cell or the second cell, respectively; multiple rate matching patterns may be associated with multiple PCIs; the plurality of rate matching patterns are associated with RS configuration information of a plurality of neighbor cells.

Optionally, in this embodiment of the present application, if the rate matching pattern is associated with one PCI, the UE considers that RS resources in a cell corresponding to the PCI are unavailable for PDSCH scheduling and transmission of the current serving cell.

Optionally, in this embodiment of the application, when the first condition is satisfied by the first indication information, the rate matching mode of the fifth cell may be divided into a first rate matching mode and a second rate matching mode.

Optionally, in this embodiment of the application, the fifth cell is at least one of the first cell and the second cell.

Optionally, in this embodiment of the present application, the first rate matching mode may be determined according to a first preset rule, and the second rate matching mode may be determined according to a second preset rule.

Optionally, in this embodiment of the present application, the first preset rule includes any one of the following conditions:

associating a rate matching mode of the PCI before switching;

determining the rate matching mode of the fifth cell according to the data scheduling conditions of other cells except the fifth cell

For example, when the fifth cell is the first cell, the PDSCH of the second cell is scheduled and transmitted in association with the switched PCI, and the rate matching pattern of the fifth cell is a combination of RS resources associated with the PCI before switching in the first cell and SSB resources associated with the PCI after switching in the second cell.

Optionally, in this embodiment of the application, the second preset rule includes any one of the following conditions:

correlating the switched PCI rate matching mode;

and determining the rate matching mode of the fifth cell according to the data scheduling conditions of other cells except the fifth cell.

For example, when the fifth cell is the first cell, the PDSCH of the second cell schedules and transmits the PCI before the association handover, and the rate matching pattern of the fifth cell is a combination of RS resources of the PCI after the association handover in the first cell and SSB resources of the PCI before the association handover in the second cell.

Optionally, in this embodiment, the UE considers that PDSCH scheduling and transmission associated with the PCI before handover should be based on the first rate matching mode.

Optionally, in this embodiment, the UE considers that PDSCH scheduling and transmission associated with the switched PCI should be based on the second rate matching mode.

Optionally, in this embodiment of the present application, when the first indication information satisfies the second condition, the UE falls back to the single carrier scheduling state, determines the serving cell according to a preset rule, and deactivates other cells in the CC list, and the rate matching mode of the serving cell is determined according to the PCI associated with PDSCH scheduling and transmission.

Optionally, in this embodiment of the present application, the PDSCH schedules a PCI before handover corresponding to a serving cell associated with transmission, and the rate matching mode is determined according to RS resource configuration associated with the PCI before handover.

Optionally, in this embodiment of the present application, the PDSCH schedules the post-handover PCI corresponding to the transmission-associated serving cell, and the rate matching mode is determined according to RS resource configuration associated with the post-handover PCI.

The embodiment of the application provides a cell switching method, wherein a UE performs transmission mode switching on a target cell according to target indication information, the target indication information is used for indicating a target unified TCI state, and the target cell comprises a first cell and/or a second cell corresponding to the UE. In the scheme, in a CA scene, the UE can switch transmission modes of the target cell according to the indication information of the target unified TCI state so as to realize the rapid switching of the cell, and compared with the traditional method that the network explicitly sends RRC reconfiguration signaling to inform the UE of cell switching, the flexibility of the system is improved, the cell switching time delay is reduced, and the flexibility of cell switching is improved.

It should be noted that, in the cell handover method provided in the embodiment of the present application, the execution subject may be a UE, or a cell handover apparatus, or a control module in the cell handover apparatus for executing the cell handover method. The cell switching apparatus provided in the embodiment of the present application is described with reference to a method for UE to perform cell switching as an example.

Fig. 3 shows a schematic diagram of a possible structure of a cell switching apparatus involved in the embodiment of the present application. As shown in fig. 3, the cell switching apparatus 60 may include: an acquisition module 61 and an execution module 62.

The obtaining module 61 is configured to obtain the target indication information. An executing module 62, configured to execute transmission mode switching on the target cell according to the target indication information; wherein the target indication information is used for indicating a target unified TCI state, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

In a possible implementation manner, the first cell is a primary cell, and the second cell is a secondary cell.

In a possible implementation manner, the transmission manner includes at least one of the following: unified TCI status, rate matching mode.

In a possible implementation manner, the target indication information is any one of the following: downlink control information DCI, media access control layer control unit MAC CE signaling and radio resource control RRC signaling.

In a possible implementation manner, the target indication information is further used for indicating a source cell or a source transmission reception point TRP corresponding to the unified TCI state.

In a possible implementation manner, the unified TCI state is a unified TCI state in a unified TCI state pool; the unified TCI state pool is a unified TCI state pool shared by the first information in the third cell; wherein the third cell comprises at least one of: the method comprises the steps that a first cell, a second cell, all cells in a Carrier Component (CC) list configured by a network, neighbor cells of the first cell, neighbor cells of the second cell and neighbor cells of all cells in the CC list configured by the network are selected; the first information includes at least one of: reference signal RS, control channel, data channel.

In a possible implementation manner, the executing module 62 is specifically configured to determine, according to the target indication information, a first unified TCI status of the target cell; determining a cell in which PCI switching occurs according to the first unified TCI state of the target cell; and executing the switching of the transmission mode for the cell with the PCI switching.

In a possible implementation manner, the executing module 62 is specifically configured to determine, according to a first preset rule, one QCL type resource RS identifier in the target unified TCI state as a target RS identifier; and determining the first RS as a first unified TCI state of the target cell, wherein the first RS is an RS corresponding to the target RS identifier in the target cell.

In a possible implementation manner, the executing module 62 is specifically configured to determine that the fourth cell is a cell where PCI handover occurs, where the fourth cell is the first cell or the second cell, when the target cell includes the fourth cell and the first unified TCI state of the fourth cell satisfies the first condition; or, in a case that the target cell includes the first cell and the second cell, and a first joint TCI state of a fifth cell in the target cell satisfies a first condition, determining that the fifth cell is a cell where the PCI handover occurs, where the fifth cell includes at least one of: a first cell and a second cell; wherein the first condition is any one of:

In a possible implementation manner, the indication of the neighbor cell association information is used to determine neighbor cell association information; the neighbor cell association information includes at least one of: the period of the RS of the adjacent cell, the time domain position of the RS of the adjacent cell, the sending power of the RS of the adjacent cell and the PCI of the adjacent cell.

In a possible implementation manner, the executing module 62 is specifically configured to determine that the second unified TCI state of the target cell is the first unified TCI state of the target cell when the third condition is met; wherein the third condition comprises at least one of:

In a possible implementation manner, the second unified TCI status of the target cell is any one of:

unified TCI state of part channels and/or RS in the target cell;

unified TCI status for all channels and/or RSs in the target cell.

In a possible implementation manner, the executing module 62 is specifically configured to execute the switching of the rate matching mode for the cell in which the PCI switching occurs, when the first unified TCI state of the target cell satisfies the third condition.

In a possible implementation manner, the first cell and the second cell are respectively configured with a plurality of rate matching modes;

In a possible implementation manner, the rate matching mode of the target cell is determined by a second preset rule;

the second preset rule is at least one of the following:

correlating the rate matching mode of the PCI before switching;

correlating the switched PCI rate matching mode;

In a possible implementation manner, the executing module 62 is specifically configured to, when a fourth condition is met, back to a single carrier scheduling state, determine a serving cell according to a third preset rule, deactivate other cells in the CC list, and determine that the second unified TCI state of the serving cell is the first unified TCI state of the serving cell; the service cell is a first cell or a second cell; wherein the fourth condition includes at least one of:

In a possible implementation manner, the second unified TCI status of the serving cell is any one of:

unified TCI state of partial channels and/or RS in the serving cell;

unified TCI status for all channels and/or RSs in the serving cell.

In a possible implementation manner, the rate matching mode of the serving cell is determined by a PCI associated with scheduling and transmission of a PDSCH (physical downlink shared channel);

and dispatching the switched PCI corresponding to the transmission associated service cell by the PDSCH, and determining the rate matching mode according to the RS resource configuration associated with the switched PCI.

The embodiment of the application provides a cell switching device, under the CA scene, the cell switching device can switch transmission modes of a target cell according to indication information of a target unified TCI state to realize rapid switching of the cell, and compared with a traditional network, the cell switching device explicitly sends an RRC reconfiguration signaling to inform UE (user equipment) to switch the cell, so that the flexibility of a system is improved, the cell switching time delay is reduced, and the flexibility of cell switching is improved.

The cell switching apparatus in the embodiment of the present application may be an apparatus, an apparatus with an operating system, or a UE, and may also be a component, an integrated circuit, or a chip in the UE. The apparatus or UE may be a mobile terminal or a non-mobile terminal. By way of example, the mobile terminal may include, but is not limited to, the UE 11 of the type listed above, and the non-mobile terminal may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (Television), a teller machine (TV), or a self-service machine (kiosk), and the embodiments of the present application are not limited in particular.

The cell switching device provided in the embodiment of the present application can implement each process implemented by the foregoing method embodiment, and achieve the same technical effect, and for avoiding repetition, details are not described here again.

Optionally, as shown in fig. 4, an embodiment of the present application further provides a communication device 500, which includes a processor 501, a memory 502, and a program or an instruction stored on the memory 502 and executable on the processor 501, for example, when the communication device 500 is a UE, the program or the instruction is executed by the processor 501 to implement the processes of the foregoing method embodiments, and the same technical effect can be achieved.

The embodiment of the application also provides a UE, which comprises a processor and a communication interface, wherein the processor is used for executing the switching of the transmission mode to the target cell according to the target indication information; wherein the target indication information is used for indicating a target unified TCI status, and the target cell includes at least one of: a first cell corresponding to the UE and a second cell corresponding to the UE. The UE embodiment corresponds to the UE side method embodiment, and all implementation processes and implementation manners of the method embodiment can be applied to the UE embodiment, and the same technical effects can be achieved. Specifically, fig. 5 is a schematic diagram of a hardware structure of a UE implementing the embodiment of the present application.

The UE 100 includes but is not limited to: at least part of the radio frequency unit 101, the network module 102, the audio output unit 103, the input unit 104, the sensor 105, the display unit 106, the user input unit 107, the interface unit 108, the memory 109, and the processor 110, etc.

Those skilled in the art will appreciate that the UE 100 may further include a power supply (e.g., a battery) for supplying power to various components, which may be logically connected to the processor 110 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system. The UE structure shown in fig. 5 does not constitute a limitation of the UE, and the UE may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is not repeated herein.

It should be understood that, in the embodiment of the present application, the input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, and the Graphics Processing Unit 1041 processes image data of a still picture or a video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 106 may include a display panel 1061, and the display panel 1061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 107 includes a touch panel 1071 and other input devices 1072. The touch panel 1071 is also referred to as a touch screen. The touch panel 1071 may include two parts of a touch detection device and a touch controller. Other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

In the embodiment of the present application, the radio frequency unit 101 receives downlink data from a network side device, and then processes the downlink data to the processor 110; in addition, the uplink data is sent to the network side equipment. Typically, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 109 may be used to store software programs or instructions as well as various data. The memory 109 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, an application program or instruction (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. In addition, the Memory 109 may include a high-speed random access Memory, and may further include a nonvolatile Memory, wherein the nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (Erasable PROM, EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), or a flash Memory. Such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.

Processor 110 may include one or more processing units; alternatively, the processor 110 may integrate an application processor that primarily handles operating systems, user interfaces, and applications or instructions, etc., and a modem processor that primarily handles wireless communications, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The processor 110 is configured to perform transmission mode switching on the target cell according to the target indication information; wherein the target indication information is used for indicating a target unified TCI state, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

The embodiment of the application provides a UE, and under a CA scene, the UE can switch transmission modes to a target cell according to indication information of a target unified TCI state so as to realize rapid switching of the cell, and compared with a traditional network, the UE is explicitly informed of cell switching by explicitly sending an RRC reconfiguration signaling, so that the flexibility of a system is improved, the cell switching time delay is reduced, and the flexibility of cell switching is improved.

The UE provided in the embodiment of the present application can implement each process implemented by the foregoing method embodiment, and achieve the same technical effect, and is not described here again to avoid repetition.

An embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the cell handover method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

Wherein the processor is the processor in the UE described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the cell handover method embodiment, and can achieve the same technical effect, and in order to avoid repetition, the description is omitted here.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (e.g., a mobile phone, a computer, a server, an air conditioner, or a network-side device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for cell handover, comprising:

the user equipment UE executes the switching of the transmission mode to the target cell according to the target indication information;

wherein the target indication information is used for indicating a target unified Transmission Configuration Indication (TCI) state, and the target cell includes at least one of the following: a first cell corresponding to the UE and a second cell corresponding to the UE.

2. The method of claim 1, wherein the first cell is a primary cell and the second cell is a secondary cell.

3. The method according to claim 1 or 2, wherein the transmission mode comprises at least one of: unified TCI status, rate matching mode.

4. The method according to claim 1, wherein the target indication information is any one of: downlink control information DCI, media access control layer control unit MAC CE signaling, and radio resource control RRC signaling.

5. The method of claim 1, wherein the target indication information is further used for indicating a source cell or a source transmission reception point TRP corresponding to a unified TCI status.

6. The method of any of claim 1, wherein the unified TCI state is one unified TCI state in a pool of unified TCI states;

the unified TCI state pool is a unified TCI state pool shared by first information in a third cell;

wherein the third cell comprises at least one of: the first cell, the second cell, all cells in a Carrier Component (CC) list configured by a network, neighbor cells of the first cell, neighbor cells of the second cell, and neighbor cells of all cells in a CC list configured by a network;

the first information includes at least one of: reference signal RS, control channel, data channel.

7. The method of claim 1, wherein the UE performs the handover of the transmission scheme to the target cell according to the target indication information, comprising:

the UE determines a first unified TCI state of the target cell according to the target indication information;

the UE determines a cell with PCI switching according to the first unified TCI state of the target cell;

and the UE executes the switching of the transmission mode to the cell with the PCI switching.

8. The method of claim 7, wherein the determining, by the UE, the first unified TCI status of the target cell according to the target indication information comprises:

the UE determines one QCL type resource RS identifier in the target unified TCI state as a target RS identifier according to a first preset rule;

and the UE determines a first RS as a first uniform TCI state of the target cell, wherein the first RS is an RS corresponding to the target RS identifier in the target cell.

9. The method of claim 8, wherein the UE determines the cell in which the PCI handover occurs according to the first unified TCI status of the target cell, and wherein the determining comprises:

when the target cell includes a fourth cell and a first unified TCI status of the fourth cell satisfies a first condition, the UE determines that the fourth cell is the cell where the PCI is switched, and the fourth cell is the first cell or the second cell; alternatively, the first and second electrodes may be,

on a condition that the target cell includes the first cell and the second cell and a first joint TCI status of a fifth cell of the target cells satisfies a first condition, the UE determines that the fifth cell is the cell in which the PCI handover occurs, the fifth cell including at least one of: the first cell and the second cell;

wherein the first condition is any one of:

the first RS corresponding to the first unified TCI state of the target cell belongs to a neighbor cell of the target cell;

a quasi co-location QCL resource RS of the first RS corresponding to a first unified TCI state of the target cell is a neighbor cell of the target cell;

the first unified TCI status of the target cell carries the PCI of the neighbor cell of the target cell or an indication of neighbor cell association information of the target cell;

the TCI status of the first RS corresponding to the first unified TCI status of the target cell carries the PCI of the neighbor cell of the target cell or an indication of neighbor cell association information of the target cell.

10. The method of claim 9, wherein the indication of the neighbor cell association information is used to determine neighbor cell association information;

the neighbor cell association information includes at least one of: the period of the RS of the adjacent cell, the time domain position of the RS of the adjacent cell, the sending power of the RS of the adjacent cell and the PCI of the adjacent cell.

11. The method of claim 9, wherein the UE performs the transmission mode handover for the cell in which the PCI handover occurs, and wherein the performing comprises:

determining, by the UE, that a second unified TCI state of the target cell is a first unified TCI state of the target cell, if a third condition is satisfied;

wherein the third condition comprises at least one of:

the first RS corresponding to the first unified TCI state of the target cell and the RSs corresponding to the unified TCI states of other cells except the target cell belong to different cells;

the PCI or neighbor cell related information indication carried by the TCI state of the first RS corresponding to the first unified TCI state of the target cell is different from the PCI or neighbor cell related information indication carried by the TCI state of the RS corresponding to the unified TCI states of other cells except the target cell.

12. The method of claim 11, wherein the second unified TCI status of the target cell is any one of:

a unified TCI state of a part of channels and/or RSs in the target cell;

a unified TCI status for all channels and/or RSs in the target cell.

13. The method of claim 11, wherein the UE performs a transmission mode handover for the cell in which the PCI handover occurs, and wherein the method comprises:

and under the condition that the first unified TCI state of the target cell meets the third condition, the UE performs switching of a rate matching mode on the cell in which the PCI switching occurs.

14. The method of claim 13, wherein the first cell and the second cell are configured with a plurality of rate matching patterns, respectively;

the rate matching modes are associated with the PCIs, and each rate matching mode corresponds to one PCI;

15. The method according to claim 13 or 14, wherein the rate matching pattern of the target cell is determined by a second predetermined rule;

the second preset rule is at least one of the following:

associating a rate matching mode of the PCI before switching;

associating the switched rate matching mode of the PCI;

and determining a rate matching mode according to the data scheduling conditions of other cells except the target cell.

16. The method of claim 9, wherein the UE performs the transmission mode handover for the cell in which the PCI handover occurs, and wherein the performing comprises:

under the condition that a fourth condition is met, the UE backs to a single carrier scheduling state, determines a serving cell according to a third preset rule, deactivates other cells in a CC list, and determines that a second unified TCI state of the serving cell is a first unified TCI state of the serving cell;

wherein the serving cell is the first cell or the second cell;

wherein the fourth condition comprises at least one of:

the PCI carried by the first unified TCI state of the target cell is the same as the PCI carried by the unified TCI state of at least one other cell except the target cell.

17. The method of claim 16, wherein the second unified TCI status of the serving cell is any one of:

unified TCI state of partial channels and/or RS in the serving cell;

a unified TCI status for all channels and/or RSs in the serving cell.

18. The method according to claim 16 or 17, wherein the rate matching pattern of the serving cell is determined by a PCI associated with physical downlink shared channel, PDSCH, scheduling and transmission;

the PDSCH schedules and transmits a PCI before switching corresponding to the service cell, and the rate matching mode is determined according to RS resource configuration related to the PCI before switching;

and the PDSCH schedules and transmits the switched PCI corresponding to the associated serving cell, and the rate matching mode is determined according to RS resource configuration associated with the switched PCI.

19. A cell switching apparatus, comprising: an execution module;

the execution module is used for executing the switching of the transmission mode to the target cell according to the target indication information;

wherein the target indication information is used for indicating a target unified TCI status, and the target cell includes at least one of: a first cell corresponding to the UE and a second cell corresponding to the UE.

20. The apparatus of claim 19, wherein the execution module is specifically configured to determine a first unified TCI status of the target cell according to the target indication information; determining a cell in which PCI switching occurs according to the first unified TCI state of the target cell; and executing the switching of the transmission mode for the cell with the PCI switching.

21. The apparatus according to claim 20, wherein the execution module is specifically configured to determine, according to a first preset rule, one QCL-type resource RS identifier in the target unified TCI state as a target RS identifier; and determining a first RS as a first unified TCI state of the target cell, wherein the first RS is an RS corresponding to the target RS identifier in the target cell.

22. The apparatus of claim 21, wherein the performing module is specifically configured to determine that the fourth cell is the cell where the PCI handover occurs, where the target cell includes the fourth cell, and a first unified TCI status of the fourth cell satisfies a first condition, and the fourth cell is the first cell or the second cell; or, when the target cell includes the first cell and the second cell and a first joint TCI status of a fifth cell of the target cells satisfies a first condition, determine that the fifth cell is the cell where the PCI handover occurs, where the fifth cell includes at least one of: the first cell and the second cell;

wherein the first condition is any one of:

23. The apparatus of claim 22, wherein the performing module is specifically configured to determine that the second unified TCI status of the target cell is the first unified TCI status of the target cell if a third condition is met;

wherein the third condition comprises at least one of:

24. The apparatus of claim 23, wherein the performing module is specifically configured to perform the rate matching mode handover for the cell in which the PCI handover occurs if the first unified TCI status of the target cell satisfies the third condition.

25. The apparatus according to claim 22, wherein the execution module is specifically configured to, if a fourth condition is satisfied, back to a single carrier scheduling state, determine a serving cell according to a third preset rule, deactivate other cells in a CC list, and determine that the second unified TCI state of the serving cell is the first unified TCI state of the serving cell;

wherein the serving cell is the first cell or the second cell;

wherein the fourth condition comprises at least one of:

a first RS corresponding to a first unified TCI state of the target cell and an RS corresponding to a unified TCI state of at least one other cell except the target cell belong to the same cell;

26. A user equipment, UE, comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, which program or instructions, when executed by the processor, implement the steps of the cell handover method according to any of claims 1 to 18.

27. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the cell handover method according to any one of claims 1 to 18.