Information feedback method and device

Abstract

The embodiment of the invention discloses an information feedback method and device, which can be applied to the technical field of communication, and the method executed by network side equipment comprises the following steps: when the network side equipment responds to a target cell of the network side equipment and receives a cell switching message sent by terminal equipment, switching the terminal equipment to the target cell; and if the feedback information that the terminal equipment feeds back the PDSCH sent by the source cell of the network side equipment before is not received, determining the feedback of the terminal equipment on the PDSCH. Therefore, the network side device can determine the feedback of the terminal device to the PDSCH sent by the source cell of the network side device before the cell switching message, and the network side device can determine whether the PDSCH is successfully transmitted, thereby avoiding data loss or reducing repeated transmission of data.

Description

Information feedback method and device Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an information feedback method and device. Background Art

[0002] In related technologies, network-side equipment maintains multiple candidate cells for terminal devices and configures evaluation criteria. The terminal device can determine whether a cell handover is necessary based on whether the Layer 1 (L1) measurement results meet the evaluation criteria. If a cell handover is determined to be necessary, the terminal device can select the target cell to access.

[0003] However, when the terminal device determines that a cell switch is required, the feedback information of the physical downlink shared channel (PDSCH) sent by the network side device has not yet been fed back. If the terminal device interrupts the transmission of the feedback information to perform a cell switch, the network side device will be unable to determine whether the PDSCH transmission is successful. This is a problem that needs to be solved urgently.

[0004] Summary of the Invention

[0005] The embodiments of the present disclosure provide an information feedback method and apparatus, wherein a network side device can determine the feedback of a terminal device on the PDSCH sent by the source cell of the network side device before the cell switching message, and the network side device can determine whether the PDSCH is successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0006] In a first aspect, an embodiment of the present disclosure provides an information feedback method, which is executed by a network side device, and the method includes: when the target cell of the network side device receives a cell switching message sent by a terminal device, the network side device has not yet received feedback information of the terminal device on the PDSCH previously sent by the source cell of the network side device, and determines the feedback of the terminal device on the PDSCH.

[0007] In this technical solution, when a network device receives a cell handover message from a terminal device, but has not yet received feedback from the terminal device regarding feedback information for a previously transmitted PDSCH, it determines the terminal device's feedback regarding the PDSCH. Thus, the network device can determine the terminal device's feedback regarding the PDSCH transmitted by the source cell of the network device prior to the cell handover message, and can determine whether the PDSCH was successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0008] In a second aspect, an embodiment of the present disclosure provides another information feedback method, which is executed by a terminal device, and the method includes: sending a cell switching message to a target cell of a network side device, wherein the cell switching message is used to indicate that the terminal device needs to switch from a source cell to a target cell; in response to the fact that feedback information on the PDSCH previously sent by the source cell of the network side device has not yet been fed back, determining to execute a specific processing flow to feed back the feedback information on the PDSCH sent by the source cell of the network side device.

[0009] In a third aspect, an embodiment of the present disclosure provides a communication device that implements some or all of the functions of the network-side device in the method described in the first aspect above. For example, the functions of the communication device may include some or all of the functions in the embodiments of the present disclosure, or may include the functions of implementing any one of the embodiments of the present disclosure separately. The functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0010] In one implementation, the communication device may include a transceiver module and a processing module, wherein the processing module is configured to support the communication device in performing the corresponding functions of the above-mentioned method. The transceiver module is used to support communication between the communication device and other devices. The communication device may also include a storage module, which is coupled to the transceiver module and the processing module and stores computer programs and data necessary for the communication device.

[0011] In one implementation, the communication device includes: a processing module, configured to determine the terminal device's feedback on the PDSCH in response to the network side device's target cell receiving a cell switching message sent by the terminal device, and not yet receiving feedback information from the terminal device on the PDSCH previously sent by the source cell of the network side device.

[0012] In a fourth aspect, an embodiment of the present disclosure provides another communication device that has some or all of the functions of the terminal device in the method example described in the second aspect above. For example, the functions of the communication device may have some or all of the functions in the embodiments of the present disclosure, or may have the functions of implementing any one of the embodiments of the present disclosure alone. The functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0013] In one implementation, the communication device may include a transceiver module and a processing module, the processing module being configured to support the communication device in performing the corresponding functions of the above-described method. The transceiver module is configured to support communication between the communication device and other devices. The communication device may also include a storage module, coupled to the transceiver module and the processing module, which stores computer programs and data necessary for the communication device.

[0014] In one implementation, the communication device includes: a transceiver module, configured to send a cell switching message to a target cell of a network side device, wherein the cell switching message is used to indicate that the terminal device needs to switch from a source cell to a target cell; a processing module, configured to determine to execute a specific processing procedure in response to the existence of feedback information on the PDSCH sent by the source cell of the network side device that has not yet been fed back, so as to provide feedback on the feedback information on the PDSCH sent by the source cell of the network side device.

[0015] In a fifth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor. When the processor calls a computer program in a memory, the method described in the first aspect is executed.

[0016] In a sixth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor. When the processor calls a computer program in a memory, the method described in the second aspect is executed.

[0017] In the seventh aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the first aspect above.

[0018] In an eighth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the second aspect above.

[0019] In a ninth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the first aspect above.

[0020] In the tenth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the second aspect above.

[0021] In the eleventh aspect, an embodiment of the present disclosure provides an information feedback system, which includes the communication device described in the third aspect and the communication device described in the fourth aspect, or the system includes the communication device described in the fifth aspect and the communication device described in the sixth aspect, or the system includes the communication device described in the seventh aspect and the communication device described in the eighth aspect, or the system includes the communication device described in the ninth aspect and the communication device described in the tenth aspect.

[0022] In a twelfth aspect, an embodiment of the present invention provides a computer-readable storage medium for storing instructions used by the above-mentioned network-side device, and when the instructions are executed, the network-side device executes the method described in the above-mentioned first aspect.

[0023] In a thirteenth aspect, an embodiment of the present invention provides a readable storage medium for storing instructions for the above-mentioned terminal device, and when the instructions are executed, the terminal device executes the method described in the second aspect.

[0024] In a fourteenth aspect, the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect above.

[0025] In a fifteenth aspect, the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the second aspect above.

[0026] In a sixteenth aspect, the present disclosure provides a chip system comprising at least one processor and an interface for supporting a network-side device in implementing the functions described in the first aspect, such as determining or processing at least one of the data and information involved in the aforementioned method. In one possible design, the chip system further comprises a memory for storing computer programs and data necessary for the network-side device. The chip system may consist of a single chip or may include a chip and other discrete components.

[0027] In a seventeenth aspect, the present disclosure provides a chip system comprising at least one processor and an interface for supporting a terminal device in implementing the functions described in the second aspect, such as determining or processing at least one of the data and information described in the aforementioned method. In one possible design, the chip system further comprises a memory for storing computer programs and data necessary for the terminal device. The chip system may consist of a chip alone or may include a chip and other discrete components.

[0028] In an eighteenth aspect, the present disclosure provides a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect above.

[0029] In a nineteenth aspect, the present disclosure provides a computer program, which, when executed on a computer, enables the computer to execute the method described in the second aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the background technology, the drawings required for use in the embodiments of the present disclosure or the background technology will be described below.

[0031] FIG1 is an architecture diagram of a communication system provided by an embodiment of the present disclosure;

[0032] FIG2 is a schematic diagram of an L1 / L2-based inter-cell mobility support method provided by an embodiment of the present disclosure;

[0033] FIG3 is a flow chart of an information feedback method provided by an embodiment of the present disclosure;

[0034] FIG4 is a flow chart of another information feedback method provided by an embodiment of the present disclosure;

[0035] FIG5 is a flowchart of another information feedback method provided by an embodiment of the present disclosure;

[0036] FIG6 is a flowchart of another information feedback method provided by an embodiment of the present disclosure;

[0037] FIG7 is a flowchart of another information feedback method provided by an embodiment of the present disclosure;

[0038] FIG8 is a flowchart of another information feedback method provided by an embodiment of the present disclosure;

[0039] FIG9 is a flowchart of another information feedback method provided by an embodiment of the present disclosure;

[0040] FIG10 is a flowchart of another information feedback method provided by an embodiment of the present disclosure;

[0041] FIG11 is a flowchart of another information feedback method provided by an embodiment of the present disclosure;

[0042] FIG12 is a schematic diagram of another information feedback method provided by an embodiment of the present disclosure;

[0043] FIG13 is a schematic diagram of another information feedback method provided by an embodiment of the present disclosure;

[0044] FIG14 is a structural diagram of a communication device provided by an embodiment of the present disclosure;

[0045] FIG15 is a structural diagram of another communication device provided by an embodiment of the present disclosure;

[0046] FIG16 is a schematic structural diagram of a chip provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] In order to better understand the information feedback method and apparatus disclosed in the embodiments of the present disclosure, the communication system to which the embodiments of the present disclosure are applicable is first described below.

[0048] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and are not to be construed as limitations on the present disclosure. In the description of the present disclosure, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: the existence of A alone, the existence of A and B at the same time, and the existence of B alone.

[0049] Please refer to Figure 1, which is a schematic diagram of the architecture of a communication system provided in an embodiment of the present disclosure. The communication system may include, but is not limited to, one network-side device and one terminal device. The number and form of devices shown in Figure 1 are for example purposes only and do not constitute a limitation on the embodiments of the present disclosure. In actual applications, two or more network-side devices and two or more terminal devices may be included. The communication system 10 shown in Figure 1 includes, for example, one network-side device 101 and one terminal device 102.

[0050] It should be noted that the technical solutions of the embodiments of the present disclosure can be applied to various communication systems, such as long-term evolution (LTE) systems, fifth-generation (5G) mobile communication systems, 5G new radio (NR) systems, or other future new mobile communication systems.

[0051] The network side device 101 in the embodiment of the present disclosure is an entity on the network side for transmitting or receiving signals. For example, the network side device 101 can be an evolved NodeB (eNB), a transmission reception point (TRP), a next generation NodeB (gNB) in an NR system, a base station in other future mobile communication systems, or an access node in a wireless fidelity (WiFi) system. The embodiment of the present disclosure does not limit the specific technology and specific device form adopted by the network side device 101. The network side device 101 provided in the embodiment of the present disclosure can be composed of a centralized unit (CU) and a distributed unit (DU), wherein the CU can also be called a control unit. The CU-DU structure can be used to split the network side device 101, such as the protocol layer of the network side device 101, and the functions of some protocol layers are placed in the CU for centralized control, and the functions of the remaining part or all of the protocol layers are distributed in the DU, and the DU is centrally controlled by the CU.

[0052] The terminal device 102 in the embodiment of the present disclosure is an entity on the user side for receiving or transmitting signals, such as a mobile phone. The terminal device can also be called a user equipment (UE) terminal, a mobile station (MS), a mobile terminal (MT), etc. The terminal device can be a car with communication functions, a smart car, a mobile phone, a wearable device, a tablet computer (Pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal device in a smart home, etc. The embodiment of the present disclosure does not limit the specific technology and specific device form adopted by the terminal device.

[0053] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

[0054] In addition, in order to facilitate understanding of the embodiments of the present disclosure, the following points are explained.

[0055] First, in the embodiments of the present disclosure, "used to indicate" can include being used for direct indication and being used for indirect indication. When describing that certain information is used to indicate A, it can include that the information carries A, or it can also include that the information directly indicates A or indirectly indicates A, but it does not necessarily mean that the information carries A.

[0056] The information indicated by the information is called the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, where there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can be achieved by using the arrangement order of each piece of information that is pre-agreed (for example, specified by the protocol), thereby reducing the indication overhead to a certain extent.

[0057] The information to be indicated can be sent as a whole or as multiple sub-information messages that are sent separately. The transmission periods and / or timings of these sub-information messages can be the same or different. The specific transmission method is not limited in this disclosure. The transmission periods and / or timings of these sub-information messages can be predefined, for example, according to a protocol.

[0058] Second, in the present disclosure, the first, second, and various numerical numbers (e.g., "#1", "#2") are merely distinctions made for ease of description and are not intended to limit the scope of the embodiments of the present disclosure. For example, to distinguish different information, etc.

[0059] Third, the embodiments of the present disclosure list multiple implementation methods to clearly illustrate the technical solutions of the embodiments of the present disclosure. Of course, those skilled in the art will understand that the multiple embodiments provided in the embodiments of the present disclosure can be implemented individually, combined with the methods of other embodiments of the embodiments of the present disclosure, or implemented individually or in combination with some methods in other related technologies; the embodiments of the present disclosure are not limited to this.

[0060] Discussions for Release 18 (Rel-18) mobility enhancements aim to support inter-cell mobility (LTM) based on L1 measurements and L1 / L2 signaling. This enhancement primarily addresses mobility issues in inter-DU and intra-DU scenarios.

[0061] Among them, the inter-DU scenario between distributed units can be understood as the source cell and target cell of cell handover are connected to different DUs respectively, and the intra-DU scenario within a distributed unit can be understood as the source cell and target cell of cell handover are connected to the same DU.

[0062] Figure 2 illustrates a possible LTM process. As shown in Figure 2, the network device pre-configures multiple candidate cells for the UE and configures evaluation criteria. The UE determines whether a cell handover is necessary based on whether the Layer 1 (L1) measurement results meet the evaluation criteria. If a cell handover is necessary, the UE selects the target cell.

[0063] However, when the terminal device determines that a cell switch is required, the feedback information of the hybrid automatic repeat request (HARQ)-acknowledgement (ACK) of the PDSCH sent by the network side device has not yet been fed back. If the terminal device interrupts the transmission of the feedback information to perform a cell switch, the network side device will be unable to determine whether the PDSCH transmission is successful. This is a problem that needs to be solved urgently.

[0064] Based on this, an embodiment of the present disclosure provides an information feedback method, in which a network-side device responds to a target cell of the network-side device receiving a cell switching message sent by a terminal device, but has not yet received HARQ-ACK feedback information of the terminal device for the PDSCH previously sent by the source cell of the network-side device, and determines the terminal device's feedback on the PDSCH. Thus, the network-side device can determine the terminal device's feedback on the PDSCH sent by the source cell of the network-side device before the cell switching message, and the network-side device can determine whether the PDSCH is successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0065] The following is a detailed introduction to an information feedback method and device provided by the present disclosure with reference to the accompanying drawings.

[0066] Please refer to Figure 3, which is a flow chart of an information feedback method provided by an embodiment of the present disclosure. As shown in Figure 3, the method is executed by a network-side device and may include but is not limited to the following steps:

[0067] S31: In response to the target cell of the network side device receiving the cell switching message sent by the terminal device, the feedback information of the terminal device on the PDSCH previously sent by the source cell of the network side device has not been received, and the feedback of the terminal device on the PDSCH is determined.

[0068] In an embodiment of the present disclosure, when the target cell of the network side device receives the cell switching message sent by the terminal device, if it has not yet received the feedback information of the terminal device on the PDSCH previously sent by the source cell of the network side device, it can determine the feedback of the terminal device on the PDSCH.

[0069] In some possible implementations, the network-side device determines the feedback of the terminal device on the PDSCH, and may determine that the terminal device has received the PDSCH.

[0070] Exemplarily, the network-side device may default the previously sent PDSCH feedback information to be confirmation (ACK) information / message.

[0071] In some other possible implementations, the network-side device determines the feedback of the terminal device on the PDSCH and may determine that the terminal device has not received the PDSCH.

[0072] Exemplarily, the network-side device may default the previously sent PDSCH feedback information to be non-acknowledgement (not acknowledge, NACK) information / message.

[0073] Exemplarily, when the network side device defaults that the terminal device has not received the PDSCH, the network side device may retransmit the unsuccessfully transmitted data to the terminal device through the target cell after the terminal device completes the cell switching.

[0074] In some other possible implementations, the network side device determines the feedback of the terminal device on the PDSCH and may receive feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell.

[0075] In an embodiment of the present disclosure, a cell handover message may inform a terminal device in a target cell that it needs to switch from a source cell to a target cell, wherein the source cell and the target cell may be connected to the same DU, or may be connected to different DUs respectively, and the embodiment of the present disclosure does not impose any specific restrictions on this.

[0076] In the embodiment of the present disclosure, the target cell receives a cell switching message sent by the terminal device, and the cell switching message may be a newly defined dedicated message or a random access initiated by the terminal device.

[0077] In some embodiments, the network side device stops or continues uplink data transmission and / or downlink data transmission through the source cell in response to receiving a cell switching message sent by the terminal device through the target cell.

[0078] In an embodiment of the present disclosure, when a network-side device receives a cell switching message sent by a terminal device through a target cell, the network-side device may stop uplink data transmission and / or downlink data transmission through a source cell.

[0079] It can be understood that if the terminal device does not support maintaining transmission with the source cell while accessing the target cell, the network side device can stop uplink data transmission and / or downlink data transmission through the source cell when it receives the cell switching message sent by the terminal device through the target cell.

[0080] In the embodiment of the present disclosure, when the network side device receives the cell switching message sent by the terminal device through the target cell, it can continue to perform uplink data transmission and / or downlink data transmission through the source cell.

[0081] It can be understood that if the terminal device supports maintaining transmission with the source cell while accessing the target cell, the network side device can continue to transmit uplink data and / or downlink data through the source cell when it receives the cell switching message sent by the terminal device through the target cell.

[0082] It should be noted that if the network side device continues to perform uplink data transmission and / or downlink data transmission through the source cell after receiving a cell switching message sent by the terminal device through the target cell, the network side device may determine to stop performing uplink data transmission and / or downlink data transmission through the source cell when it is determined that the terminal device has completed switching from the source cell to the target cell, or may determine to stop performing uplink data transmission and / or downlink data transmission through the source cell when it is determined that the terminal device meets other conditions. The embodiments of the present disclosure do not impose specific restrictions on this.

[0083] In some embodiments, the network side device responds to receiving a cell switching message sent by the terminal device through the target cell and determining that the terminal device completes switching from the source cell to the target cell, and determines to stop uplink data transmission and / or downlink data transmission through the source cell.

[0084] In an embodiment of the present disclosure, when the network side device receives a cell switching message sent by the terminal device through the target cell and determines that the terminal device has completed switching from the source cell to the target cell, it determines to stop uplink data transmission and / or downlink data transmission through the source cell.

[0085] It should be noted that after the network side device receives the cell switching message sent by the terminal device through the target cell and determines that the terminal device has completed the switching from the source cell to the target cell, it can maintain uplink data transmission and / or downlink data transmission with the terminal device through the source cell.

[0086] In some embodiments, after the terminal device completes switching from the source cell to the target cell, the network side device sends second indication information to the terminal device through the target cell, wherein the second indication information is used to instruct the terminal device to release resources of the source cell.

[0087] In an embodiment of the present disclosure, after the terminal device completes switching from the source cell to the target cell, the network side device can send second indication information to the terminal device through the target cell, wherein the second indication information is used to instruct the terminal device to release the resources of the source cell.

[0088] Based on this, if the terminal device supports maintaining transmission with the source cell while accessing the target cell, when the terminal device receives the second indication information sent by the network side device, it can determine to stop uplink data transmission and / or downlink data transmission with the source cell.

[0089] It can be understood that, in the case where the source cell and the target cell of the network side device are connected to the same DU, if the terminal device does not support maintaining transmission with the source cell when accessing the target cell, the source cell may stop uplink data transmission and / or downlink data transmission with the terminal device when the target cell receives the cell switching message sent by the terminal device. If the terminal device supports maintaining transmission with the source cell when accessing the target cell, the source cell may maintain uplink data transmission and / or downlink data transmission with the terminal device when the target cell receives the cell switching message sent by the terminal device, and after the terminal device completes the cell switching, the source cell stops uplink data transmission and / or downlink data transmission with the terminal device.

[0090] It can also be understood that, in the case where the source cell and the target cell of the network side device are connected to different DUs respectively, if the terminal device does not support maintaining transmission with the source cell when accessing the target cell, the source cell may stop uplink data transmission and / or downlink data transmission with the terminal device when the target cell receives the cell switching message sent by the terminal device. If the terminal device supports maintaining transmission with the source cell when accessing the target cell, the source cell may maintain uplink data transmission and / or downlink data transmission with the terminal device when the target cell receives the cell switching message sent by the terminal device, and after the terminal device completes the cell switching, the source cell stops uplink data transmission and / or downlink data transmission with the terminal device after receiving the handover success message sent by the target cell.

[0091] By implementing the embodiments of the present disclosure, the network device determines the terminal device's feedback on the PDSCH in response to the target cell of the network device receiving the cell handover message sent by the terminal device, but has not yet received the terminal device's feedback information on the PDSCH previously sent by the source cell of the network device. Thus, the network device can determine the terminal device's feedback on the PDSCH sent by the source cell of the network device before the cell handover message, and the network device can determine whether the PDSCH is successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0092] Please refer to Figure 4, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 4, the method is executed by a network-side device and may include but is not limited to the following steps:

[0093] S41: In response to the target cell of the network side device receiving the cell switching message sent by the terminal device, but not yet receiving the feedback information of the terminal device on the PDSCH previously sent by the source cell of the network side device, it is determined that the terminal device has received the PDSCH.

[0094] In the embodiment of the present disclosure, the relevant description of S41 can be found in the relevant description in the above embodiment, and will not be repeated here.

[0095] In the embodiment of the present disclosure, when the network side device receives the cell switching message sent by the terminal device, if it has not received the feedback information of the PDSCH previously sent by the terminal device, it can be determined that the terminal device has received the PDSCH.

[0096] The network side device may receive the feedback information of the terminal device on the PDSCH previously sent by the terminal device by default, and the feedback information is confirmation (acknowledge, ACK) information / message.

[0097] In an embodiment of the present disclosure, a cell switching message may indicate that a terminal device needs to switch from a source cell to a target cell, wherein the source cell and the target cell may be connected to the same DU, or may be connected to different DUs respectively, and the embodiment of the present disclosure does not impose any specific restrictions on this.

[0098] It should be noted that, in the embodiment of the present disclosure, S41 can be implemented alone or in combination with any other step in the embodiment of the present disclosure, for example, in combination with S31 in the embodiment of the present disclosure, and the embodiment of the present disclosure does not limit this.

[0099] By implementing the embodiments of the present disclosure, when the target cell of the network device receives a cell handover message sent by the terminal device, the network device determines that the terminal device has received the PDSCH, but has not yet received feedback information from the terminal device regarding the PDSCH previously sent by the source cell of the network device. Thus, the network device can determine the feedback from the terminal device regarding the PDSCH sent by the source cell of the network device before the cell handover message, and the network device can determine whether the PDSCH was successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0100] Please refer to Figure 5, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 5, the method is executed by a network-side device and may include but is not limited to the following steps:

[0101] S51: In response to the target cell of the network side device receiving the cell switching message sent by the terminal device, it is determined that the terminal device has not received the PDSCH, as feedback information of the terminal device on the PDSCH previously sent by the source cell of the network side device has not been received.

[0102] In the embodiment of the present disclosure, the relevant description of S51 can be found in the relevant description of the above embodiment, and will not be repeated here.

[0103] In the embodiment of the present disclosure, when the network side device receives the cell switching message sent by the terminal device, if it has not received the feedback information of the PDSCH previously sent by the terminal device, it can be determined that the terminal device has not received the PDSCH.

[0104] The network side device may receive the feedback information of the terminal device on the PDSCH previously sent by the terminal device by default, and the feedback information is non-acknowledgement (not acknowledge, NACK) information / message.

[0105] S52: After the terminal device completes switching from the source cell to the target cell, the target cell of the network side device sends / retransmits the unsuccessfully transmitted data to the terminal device.

[0106] In an embodiment of the present disclosure, after the terminal device completes switching from a source cell to a target cell, the network side device can send / retransmit unsuccessfully transmitted data to the terminal device through the target cell.

[0107] In an embodiment of the present disclosure, a cell switching message may indicate that a terminal device needs to switch from a source cell to a target cell, wherein the source cell and the target cell may be connected to the same DU, or may be connected to different DUs respectively, and the embodiment of the present disclosure does not impose any specific restrictions on this.

[0108] It is understood that when the source cell and the target cell are connected to the same DU, the target cell of the network-side device shares the same physical layer, medium access control layer (MAC) and radio link control layer (RLC) with the source cell. As a result, the target cell can retransmit unsuccessfully transmitted data to the terminal device.

[0109] It can be understood that when the source cell and the target cell are connected to different DUs respectively, the physical layer and MAC layer of the target cell of the network side device are different from those of the source cell. The source cell can send an SN status message to the target cell, and the target cell transmits data according to the SN status message. It can retransmit the packet data convergence layer (PDCP) service data unit (SDU) / protocol data unit (PDU) that was not successfully transmitted by the source cell by default.

[0110] It should be noted that, in the embodiment of the present disclosure, S51 and S52 can be implemented separately, or they can be implemented together with any other steps in the embodiment of the present disclosure, for example, they can be implemented together with S31 and / or S41 in the embodiment of the present disclosure, and the embodiment of the present disclosure does not limit this.

[0111] By implementing the embodiments of the present disclosure, when the target cell of the network device receives a cell handover message sent by the terminal device, the network device determines that the terminal device has not received the PDSCH, as it has not yet received the feedback information of the terminal device regarding the PDSCH previously sent by the source cell of the network device. After the terminal device completes the handover from the source cell to the target cell, the target cell of the network device sends / retransmits the unsuccessfully transmitted data to the terminal device. Thus, the network device can determine the feedback of the terminal device regarding the PDSCH sent by the source cell of the network device before the cell handover message, and the network device can determine whether the PDSCH is successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0112] Please refer to Figure 6, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 6, the method is executed by a network-side device and may include but is not limited to the following steps:

[0113] S61: In response to the target cell of the network side device receiving the cell switching message sent by the terminal device, the feedback information of the terminal device on the PDSCH previously sent by the source cell of the network side device has not yet been received, and the feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell is received.

[0114] In the embodiment of the present disclosure, the relevant description of S61 can be found in the relevant description of the above embodiment, and will not be repeated here.

[0115] In an embodiment of the present disclosure, when the network side device receives a cell switching message sent by the terminal device, if it has not yet received the feedback information of the terminal device on the PDSCH previously sent, it can receive the feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell.

[0116] In an embodiment of the present disclosure, a cell switching message may indicate that a terminal device needs to switch from a source cell to a target cell, wherein the source cell and the target cell may be connected to the same DU, or may be connected to different DUs respectively, and the embodiment of the present disclosure does not impose any specific restrictions on this.

[0117] In some embodiments, the network side device receives feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell, including: receiving feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell, wherein the feedback information includes packet data convergence protocol (PDCP) sequence number (SN) information.

[0118] In an embodiment of the present disclosure, the network side device receives feedback information sent by the terminal device to the target cell of the network side device after the terminal device switches from the source cell to the target cell, and can receive feedback information sent by the terminal device to the target cell of the network side device after the terminal device switches from the source cell to the target cell, wherein the feedback information includes PDCP SN information.

[0119] In some embodiments, the network side device receives feedback information sent by the terminal device to the target cell of the network side device when the source cell and the target cell are respectively connected to different DUs, wherein the feedback information includes PDCPSN information.

[0120] In an embodiment of the present disclosure, when the source cell and the target cell are connected to different DUs respectively, the network side device can receive feedback information sent by the terminal device to the target cell of the network side device, wherein the feedback information includes PDCPSN information.

[0121] In an embodiment of the present disclosure, the network side device can pre-configure at least one candidate cell for the terminal device, including relevant configuration information of the candidate cell, for example: the DU connected to the candidate cell. The terminal device can select a target cell from at least one candidate cell. The terminal device can determine whether the source cell and the target cell are connected to different DUs respectively based on the relevant configuration information of the candidate cell configured by the network side device.

[0122] It should be noted that, in the embodiment of the present disclosure, S61 can be implemented alone or in combination with any other step in the embodiment of the present disclosure, for example, in combination with S31 and / or S41 and / or S51 and S52 in the embodiment of the present disclosure, and the embodiment of the present disclosure is not limited to this.

[0123] By implementing the embodiments of the present disclosure, when the target cell of the network device receives a cell handover message sent by the terminal device, the network device determines that the terminal device has not received the PDSCH, as it has not yet received the feedback information of the terminal device regarding the PDSCH previously sent by the source cell of the network device. After the terminal device completes the handover from the source cell to the target cell, the target cell of the network device sends / retransmits the unsuccessfully transmitted data to the terminal device. Thus, the network device can determine the feedback of the terminal device regarding the PDSCH sent by the source cell of the network device before the cell handover message, and the network device can determine whether the PDSCH is successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0124] Please refer to Figure 7, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 7, the method is executed by a network-side device and may include but is not limited to the following steps:

[0125] S71: In response to the target cell of the network side device receiving the cell switching message sent by the terminal device, and having not yet received the feedback information of the terminal device on the PDSCH previously sent by the source cell of the network side device, a first indication information is sent to the terminal device through the source cell or the target cell, wherein the first indication information is used to indicate the feedback information sent by the terminal device to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0126] In an embodiment of the present disclosure, when the network side device receives a cell switching message sent by the terminal device, if it has not yet received feedback from the terminal device on the feedback information of the PDSCH previously sent, a one-shot HARQ ACK report can be introduced.

[0127] Among them, the network side device can send the first indication information to the terminal device through the source cell or the target cell, and the first indication information is used to instruct the terminal device to send feedback information to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0128] In the embodiment of the present disclosure, the first indication information may be downlink control information (DCI) or a medium access control (MAC) control element (CE), wherein the DCI or MAC CE includes the first indication information.

[0129] It can be understood that in the embodiments of the present disclosure, the terminal device supports stopping transmission with the source cell when accessing the target cell, or supports maintaining transmission with the source cell when accessing the target cell.

[0130] In which, when the terminal device supports maintaining transmission with the source cell when accessing the target cell, the network side device can send a second indication information to the terminal device through the target cell after the terminal device completes switching from the source cell to the target cell, wherein the second indication information is used to instruct the terminal device to release the resources of the source cell.

[0131] Based on this, if the terminal device supports maintaining transmission with the source cell while accessing the target cell, when the terminal device receives the second indication information sent by the network side device, it can determine to stop data transmission with the source cell.

[0132] It should be noted that in the embodiment of the present disclosure, the first indication information may be the same as the second indication information, that is, the second indication information may also indicate the feedback information sent by the terminal device to the target cell of the network side device after completing the switching from the source cell to the target cell, or the first indication information may also indicate the terminal device to release the resources of the source cell.

[0133] S72: Receive feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell according to the first indication information.

[0134] In the disclosed embodiment, upon receiving a cell handover message sent by a terminal device, the network device sends first indication information to the terminal device if it has not yet received feedback from the terminal device regarding previously sent PDSCH feedback information. The network device may then receive feedback information sent by the terminal device to the target cell of the network device after switching from the source cell to the target cell based on the first indication information.

[0135] In some embodiments, the network side device receives feedback information sent by the terminal device to the target cell of the network side device when the source cell and the target cell are respectively connected to different DUs, wherein the feedback information includes PDCPSN information.

[0136] In an embodiment of the present disclosure, when the source cell and the target cell are connected to different DUs respectively, the network side device can receive feedback information sent by the terminal device to the target cell of the network side device, wherein the feedback information includes PDCPSN information.

[0137] In an embodiment of the present disclosure, the network side device can pre-configure at least one candidate cell for the terminal device, including relevant configuration information of the candidate cell, for example: the DU connected to the candidate cell. The terminal device can select a target cell from at least one candidate cell. The terminal device can determine whether the source cell and the target cell are connected to different DUs respectively based on the relevant configuration information of the candidate cell configured by the network side device.

[0138] It should be noted that in the embodiments of the present disclosure, S71 and S72 can be implemented separately or in combination with any other steps in the embodiments of the present disclosure, for example, they can be implemented in combination with S31 and / or S41 and / or S51 and S52 and / or S61 in the embodiments of the present disclosure, and the embodiments of the present disclosure are not limited to this.

[0139] By implementing the embodiments of the present disclosure, when the target cell of the network device receives a cell handover message sent by the terminal device, the network device determines that the terminal device has not received the PDSCH, as it has not yet received the feedback information of the terminal device regarding the PDSCH previously sent by the source cell of the network device. After the terminal device completes the handover from the source cell to the target cell, the target cell of the network device sends / retransmits the unsuccessfully transmitted data to the terminal device. Thus, the network device can determine the feedback of the terminal device regarding the PDSCH sent by the source cell of the network device before the cell handover message, and the network device can determine whether the PDSCH is successfully transmitted, thereby avoiding data loss or reducing repeated data transmission.

[0140] Please refer to Figure 8, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 8, the method is executed by a terminal device, and the method may include but is not limited to the following steps:

[0141] S81: Send a cell switching message to the target cell of the network side device, where the cell switching message is used to indicate that the terminal device needs to switch from the source cell to the target cell.

[0142] In an embodiment of the present disclosure, a cell switching message may indicate that a terminal device needs to switch from a source cell to a target cell, wherein the source cell and the target cell may be connected to the same DU, or may be connected to different DUs respectively, and the embodiment of the present disclosure does not impose any specific restrictions on this.

[0143] In an embodiment of the present disclosure, the terminal device sends a cell switching message to the target cell of the network side device. The cell switching message may be that the terminal device initiates a random access channel (RACH) or sends a dedicated / specific message to the target cell of the network side device.

[0144] S82: In response to the fact that the feedback information of the PDSCH sent by the source cell of the network side device has not been fed back, determine to execute a specific processing flow to feed back the feedback information of the PDSCH sent by the source cell of the network side device.

[0145] In an embodiment of the present disclosure, when there is no feedback information on the PDSCH sent by the source cell of the network side device, the terminal device determines to execute a specific processing flow to feedback the feedback information on the PDSCH sent by the source cell of the network side device.

[0146] In some possible implementations, the terminal device determines to execute a specific processing flow and may determine to cancel sending feedback information to a source cell or a target cell of a network-side device.

[0147] In an embodiment of the present disclosure, when the terminal device determines to cancel sending feedback information to the source cell or target cell of the network side device, the network side device may assume that the terminal device has successfully received the PDSCH, or may also assume that the terminal device has not successfully received the PDSCH.

[0148] Exemplarily, the network-side device may receive feedback information of the terminal device on a previously sent PDSCH by default, and the feedback information is non-acknowledgement (NACK) information / message.

[0149] Exemplarily, the network-side device may receive feedback information of the terminal device on a previously sent PDSCH by default, and the feedback information is non-acknowledgement (NACK) information / message.

[0150] Among them, the network side device defaults to the case where the terminal device does not receive the PDSCH, and the network side device can retransmit the unsuccessfully transmitted data to the terminal device through the target cell after the terminal device completes the cell switching.

[0151] In some other possible implementations, the terminal device determines to execute a specific processing flow and may send feedback information to the target cell of the network side device after completing the handover from the source cell to the target cell.

[0152] In some embodiments, while accessing the target cell, the terminal device maintains or stops uplink data transmission and / or downlink data transmission with the source cell of the network side device.

[0153] In the embodiment of the present disclosure, the terminal device supports maintaining data transmission with the source cell of the network side device while accessing the target cell.

[0154] Based on this, the network side device can maintain uplink data transmission and / or downlink data transmission through the source cell when receiving the cell switching message sent by the terminal device through the target cell.

[0155] In the embodiment of the present disclosure, the terminal device does not support maintaining data transmission with the source cell of the network side device while accessing the target cell, and stops uplink data transmission and / or downlink data transmission with the source cell of the network side device.

[0156] In some embodiments, after the terminal device completes switching from the source cell to the target cell, the terminal device receives second indication information sent by the target cell of the network side device, wherein the second indication information is used to instruct the terminal device to release resources of the source cell.

[0157] In the embodiments of the present disclosure, after completing a handover from a source cell to a target cell, a terminal device may receive second indication information sent by the target cell of a network-side device, wherein the second indication information is used to instruct the terminal device to release resources of the source cell. Based on this, upon receiving the second indication information, the terminal device may release the resources of the source cell and cease uplink and / or downlink data transmission with the source cell.

[0158] In some embodiments, while accessing the target cell, the terminal device maintains data transmission with the source cell of the network side device, and stops uplink data transmission and / or downlink data transmission with the source cell of the network side device according to the second indication information.

[0159] It can be understood that if the terminal device supports maintaining data transmission with the source cell of the network side device while accessing the target cell, the terminal device can receive the second indication information sent by the target cell of the network side device after completing the switching from the source cell to the target cell, wherein the second indication information is used to instruct the terminal device to release the resources of the source cell.

[0160] Among them, the terminal device receives the second indication information sent by the target cell of the network side device, and can stop uplink data transmission and / or downlink data transmission with the source cell of the network side device according to the second indication information while accessing the target cell and maintaining data transmission with the source cell of the network side device.

[0161] By implementing the embodiments of the present disclosure, a terminal device sends a cell handover message to a target cell of a network-side device, wherein the cell handover message is used to indicate that the terminal device needs to handover from a source cell to a target cell; in response to the existence of feedback information on a PDSCH previously sent by the network-side device to the source cell that has not yet been fed back, a specific processing flow is determined to be executed to provide feedback on the feedback information on the PDSCH sent by the source cell of the network-side device. Thus, the terminal device can provide feedback on the feedback information on the PDSCH sent by the source cell of the network-side device, the network-side device can determine the feedback of the terminal device on the PDSCH sent by the source cell of the network-side device before the cell handover message, and the network-side device can determine whether the PDSCH transmission is successful, thereby avoiding data loss or reducing repeated data transmission.

[0162] Please refer to Figure 9, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 9, the method is executed by a terminal device, and the method may include but is not limited to the following steps:

[0163] S91: Send a cell switching message to the target cell of the network side device, where the cell switching message is used to indicate that the terminal device needs to switch from the source cell to the target cell.

[0164] S92: In response to the fact that the feedback information on the PDSCH previously sent by the source cell of the network side device has not been fed back, determine to cancel sending the feedback information to the source cell or the target cell of the network side device.

[0165] In the embodiment of the present disclosure, the relevant description of S91 and S92 can be found in the relevant description in the above embodiment, and will not be repeated here.

[0166] S93: After completing the handover from the source cell to the target cell, the target cell receiving the network side device sends / retransmits the unsuccessfully transmitted data when the default terminal device fails to successfully receive the PDSCH.

[0167] In an embodiment of the present disclosure, when the terminal device has not yet fed back feedback information on the PDSCH previously sent by the source cell of the network side device, and determines to cancel sending feedback information to the source cell or target cell of the network side device, the network side device may assume that the terminal device has received the PDSCH, or may also assume that the terminal device has not received the PDSCH.

[0168] Exemplarily, the network-side device may receive feedback information of the terminal device on a previously sent PDSCH by default, and the feedback information is non-acknowledgement (NACK) information / message.

[0169] Exemplarily, the network-side device may receive feedback information of the terminal device on a previously sent PDSCH by default, and the feedback information is non-acknowledgement (NACK) information / message.

[0170] Among them, the network side device defaults to the case where the terminal device does not receive the PDSCH. The network side device can retransmit the unsuccessfully transmitted data to the terminal device through the target cell or send corresponding data to the terminal device through the target cell after the terminal device completes the cell switching.

[0171] Based on this, after completing the switching from the source cell to the target cell, the terminal device can receive the PDSCH or corresponding data sent / retransmitted by the target cell of the network side device when the terminal device does not receive the PDSCH by default.

[0172] In an embodiment of the present disclosure, a cell switching message may indicate that a terminal device needs to switch from a source cell to a target cell, wherein the source cell and the target cell may be connected to the same DU, or may be connected to different DUs respectively, and the embodiment of the present disclosure does not impose any specific restrictions on this.

[0173] It is understood that when the source cell and the target cell are connected to the same DU, the target cell of the network side device shares the same physical layer, MAC layer and RLC layer with the source cell. Therefore, the target cell can retransmit the unsuccessfully transmitted data to the terminal device.

[0174] It can be understood that when the source cell and the target cell are connected to different DUs respectively, the physical layer and MAC layer of the target cell of the network side device are different from those of the source cell. The source cell can send an SN status message to the target cell, and the target cell transmits data according to the SN status message. It can retransmit the packet data convergence layer (PDCP) service data unit (SDU) / PDU that was not successfully transmitted by the source cell by default.

[0175] It should be noted that in the embodiment of the present disclosure, S91 to S93 can be implemented separately or in combination with any other steps in the embodiment of the present disclosure, for example, they can be implemented in combination with S81 and S82 in the embodiment of the present disclosure. The embodiment of the present disclosure does not limit this.

[0176] By implementing the embodiments of the present disclosure, the terminal device sends a cell handover message to the target cell of the network-side device, wherein the cell handover message is used to indicate that the terminal device needs to handover from the source cell to the target cell; in response to the existence of feedback information on the PDSCH previously sent by the source cell of the network-side device that has not yet been fed back, it is determined to cancel sending feedback information to the source cell or target cell of the network-side device. As a result, the terminal device can provide feedback on the feedback information on the PDSCH sent by the source cell of the network-side device, the network-side device can determine the feedback of the terminal device on the PDSCH sent by the source cell of the network-side device before the cell handover message, and the network-side device can determine whether the PDSCH transmission is successful, thereby avoiding data loss or reducing repeated data transmission.

[0177] Please refer to Figure 10, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 10, the method is executed by a terminal device, and the method may include but is not limited to the following steps:

[0178] S101: Send a cell switching message to a target cell of a network-side device, where the cell switching message is used to indicate that a terminal device needs to switch from a source cell to a target cell.

[0179] S102: In response to the fact that feedback information on the PDSCH previously sent by the source cell of the network side device has not been fed back, after completing the handover from the source cell to the target cell, feedback information is sent to the target cell of the network side device.

[0180] In the embodiment of the present disclosure, the relevant description of S101 can be found in the relevant description of the above embodiment, and will not be repeated here.

[0181] In an embodiment of the present disclosure, after the terminal device sends a cell switching message to the target cell of the network side device, if there is still feedback information on the PDSCH previously sent by the source cell of the network side device that has not been fed back, the terminal device can send feedback information to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0182] In an embodiment of the present disclosure, a cell switching message may indicate that a terminal device needs to switch from a source cell to a target cell, wherein the source cell and the target cell may be connected to the same DU, or may be connected to different DUs respectively, and the embodiment of the present disclosure does not impose any specific restrictions on this.

[0183] In some embodiments, the terminal device sends feedback information to the target cell of the network side device, including: sending feedback information to the target cell of the network side device, wherein the feedback information includes PDCP SN information.

[0184] In an embodiment of the present disclosure, the terminal device sends feedback information to the target cell of the network side device, and may send feedback information to the target cell of the network side device, wherein the feedback information includes PDCP SN information.

[0185] In some embodiments, in response to the source cell and the target cell being connected to different DUs respectively, the terminal device sends feedback information to the target cell of the network side device, wherein the feedback information includes PDCPSN information.

[0186] In an embodiment of the present disclosure, when the source cell and the target cell are connected to different DUs respectively, the terminal device can send feedback information to the target cell of the network side device, where the feedback information includes PDCPSN information.

[0187] In an embodiment of the present disclosure, the network side device can pre-configure at least one candidate cell for the terminal device, including relevant configuration information of the candidate cell, for example: the DU connected to the candidate cell. The terminal device can select a target cell from at least one candidate cell. The terminal device can determine whether the source cell and the target cell are connected to different DUs respectively based on the relevant configuration information of the candidate cell configured by the network side device.

[0188] It should be noted that in the embodiment of the present disclosure, S101 and S102 can be implemented separately, or they can be implemented in combination with any other steps in the embodiment of the present disclosure, for example, they can be implemented in combination with S81 and S82 and / or S91 to S93 in the embodiment of the present disclosure, and the embodiment of the present disclosure is not limited to this.

[0189] By implementing the embodiments of the present disclosure, the terminal device sends a cell handover message to the target cell of the network-side device, wherein the cell handover message is used to indicate that the terminal device needs to handover from the source cell to the target cell; in response to the existence of feedback information on the PDSCH previously sent by the source cell of the network-side device that has not yet been fed back, it is determined to cancel sending feedback information to the source cell or target cell of the network-side device. As a result, the terminal device can provide feedback on the feedback information on the PDSCH sent by the source cell of the network-side device, the network-side device can determine the feedback of the terminal device on the PDSCH sent by the source cell of the network-side device before the cell handover message, and the network-side device can determine whether the PDSCH transmission is successful, thereby avoiding data loss or reducing repeated data transmission.

[0190] Please refer to Figure 11, which is a flow chart of another information feedback method provided by an embodiment of the present disclosure. As shown in Figure 11, the method is executed by a terminal device and may include but is not limited to the following steps:

[0191] S111: Send a cell switching message to the target cell of the network side device, where the cell switching message is used to indicate that the terminal device needs to switch from the source cell to the target cell.

[0192] In the embodiments of the present disclosure, the relevant description of S111 can be found in the relevant description in the above embodiments, and will not be repeated here.

[0193] S112: In response to the fact that feedback information on the PDSCH previously sent by the source cell of the network side device has not yet been fed back, first indication information sent by the network side device through the source cell or the target cell is received, wherein the first indication information is used to instruct the terminal device to send feedback information to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0194] In an embodiment of the present disclosure, after the terminal device sends a cell switching message to the target cell of the network side device, if the feedback information of the PDSCH previously sent by the source cell of the network side device has not yet been fed back, the terminal device receives the first indication information sent by the network side device through the source cell or the target cell, wherein the first indication information is used to instruct the terminal device to send all the feedback information of the PDSCH to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0195] The feedback information is sorted according to the HARQ process ID of the PDSCH, and the corresponding ACK / NACK information is fed back.

[0196] The feedback information includes PDCP SN information, including ACK / NACK information corresponding to the PDCP SN (ie, information on whether the transmission is successful).

[0197] Among them, the terminal device can receive the first indication information sent by the network side device through the source cell or the target cell, and the first indication information is used to instruct the terminal device to send feedback information to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0198] In the embodiment of the present disclosure, the first indication information may be downlink control information (DCI) or a medium access control (MAC) control element (CE), wherein the DCI or MAC CE includes the first indication information.

[0199] It is understandable that in the embodiments of the present disclosure, the terminal device does not support maintaining transmission with the source cell when accessing the target cell, or supports maintaining transmission with the source cell when accessing the target cell.

[0200] In which, when the terminal device supports maintaining transmission with the source cell when accessing the target cell, the network side device can send a second indication information to the terminal device through the target cell after the terminal device completes switching from the source cell to the target cell, wherein the second indication information is used to instruct the terminal device to release the resources of the source cell.

[0201] Based on this, if the terminal device supports maintaining transmission with the source cell while accessing the target cell, when the terminal device receives the second indication information sent by the network side device, it can determine to stop data transmission with the source cell.

[0202] It should be noted that in the embodiment of the present disclosure, the first indication information may be the same as the second indication information, that is, the second indication information may also indicate the feedback information sent by the terminal device to the target cell of the network side device after completing the switching from the source cell to the target cell, or the first indication information may also indicate the terminal device to release the resources of the source cell.

[0203] S113: According to the first indication information, after completing the handover from the source cell to the target cell, feedback information is sent to the target cell of the network side device.

[0204] In an embodiment of the present disclosure, after a terminal device sends a cell switching message to a target cell of a network-side device, if there is still feedback information for a PDSCH previously sent by the network-side device to a source cell that has not yet been fed back, the terminal device can receive first indication information sent by the network-side device. Based on the first indication information, the terminal device can send feedback information to the target cell of the network-side device after switching from the source cell to the target cell.

[0205] In some embodiments, in response to the source cell and the target cell being connected to different DUs respectively, the terminal device sends feedback information to the target cell of the network side device, wherein the feedback information includes PDCPSN information.

[0206] In an embodiment of the present disclosure, when the source cell and the target cell are connected to different DUs respectively, the terminal device can send feedback information to the target cell of the network side device, where the feedback information includes PDCPSN information.

[0207] In an embodiment of the present disclosure, the network side device can pre-configure at least one candidate cell for the terminal device, including relevant configuration information of the candidate cell, for example: the DU connected to the candidate cell. The terminal device can select a target cell from at least one candidate cell. The terminal device can determine whether the source cell and the target cell are connected to different DUs respectively based on the relevant configuration information of the candidate cell configured by the network side device.

[0208] It should be noted that in the embodiments of the present disclosure, S111 to S113 can be implemented separately or in combination with any other steps in the embodiments of the present disclosure, for example, they can be implemented in combination with S81 and S82 and / or S91 to S93 and / or S101 to S102 in the embodiments of the present disclosure, and the embodiments of the present disclosure are not limited to this.

[0209] By implementing the embodiment of the present disclosure, the terminal device sends a cell switching message to the target cell of the network side device, wherein the cell switching message is used to indicate that the terminal device needs to switch from the source cell to the target cell; in response to the existence of feedback information on the PDSCH sent by the source cell of the network side device before, the first indication information sent by the network side device through the source cell or the target cell is received, wherein the first indication information is used to indicate the feedback information sent by the terminal device to the target cell of the network side device after completing the switching from the source cell to the target cell; according to the first indication information, after completing the switching from the source cell to the target cell, the feedback information is sent to the target cell of the network side device. Thus, the terminal device can feedback the feedback information of the PDSCH sent by the source cell of the network side device, the network side device can determine the feedback of the terminal device on the PDSCH sent by the source cell of the network side device before the cell switching message, and the network side device can determine whether the PDSCH is transmitted successfully, thereby avoiding data loss or reducing repeated transmission of data.

[0210] To facilitate understanding of the embodiments of the present disclosure, the embodiments of the present disclosure provide the following exemplary embodiments. It should be understood that the exemplary embodiments are only for illustration and are not intended to be specific limitations on the embodiments of the present disclosure.

[0211] In an exemplary embodiment, a user (terminal device, the same below) can access a target cell (target cell) while maintaining transmission with a source cell (Source cell).

[0212] For intra-DU (the source cell and the target cell are connected to the same DU):

[0213] Option 1: After the DU receives a handover message from the user (RACH or other dedicated message), the source cell can stop new downlink transmissions. After a successful handover, the DU can send an explicit message to the user requesting the release of the source cell's resources. Upon receiving this message, the user can stop data transmission with the source cell.

[0214] For PDSCHs without ACK feedback, the network-side device defaults to NACK or ACK. As shown in Figure 12 (a), after a cell switch, there are no new PDSCHs. If there are any with or without feedback, the amount of data retransmitted or discarded will not be too high.

[0215] Option 2: After the DU receives the user's handover message, the source cell continues to perform new downlink transmissions. After the handover is successful, the source cell stops data transmission with the user. In addition, the target cell sends an explicit message to the user to release the source cell's resources. Upon receiving this message, the user stops data transmission with the source cell.

[0216] As shown in Figure 12(b), there may be many PDSCHs without feedback ACK messages. Therefore, one-shot HARQ ACK reporting is introduced. It can be triggered by the target cell through DCI or through the release message.

[0217] For inter-DU (the source cell and target cell are connected to different DUs):

[0218] After the user accesses the target cell, the CU sends a handover success message to the source DU. After receiving this message, the source cell can stop transmitting downlink data.

[0219] For PDSCHs that do not receive an ACK, the default is NACK or ACK. If the response is NACK, the PDCP SDU is retransmitted. That is, the SN states fed back to the target cell default to the unsuccessfully transmitted PDCP SDU.

[0220] In an exemplary embodiment, a user (terminal device, the same below) can stop transmission with a source cell when accessing a target cell.

[0221] For intra-DU (the source cell and the target cell are connected to the same DU):

[0222] After the DU receives the user switching message, the source cell stops downlink data transmission.

[0223] Introduces one-shot HARQ ACK reporting. Triggered by the target cell via DCI. The codebook is generated sequentially based on the HARQ process ID.

[0224] For inter-DU (the source cell and target cell are connected to different DUs):

[0225] After receiving the Handover success message, the source cell stops downlink data transmission.

[0226] In this case, as shown in Figure 13, between accessing the target cell and receiving the Handover Success signal from the CU, the source cell may still be sending downlink data, but the UE has stopped receiving downlink data, and this part of the data is lost.

[0227] One way to handle this is that all data that has not received an ACK message will be retransmitted as PDCP SDU by the target cell;

[0228] Another approach is to introduce one-shot HARQ ACK feedback and retransmit the ACK information to the target cell. However, this requires a method for the target cell to identify the correspondence between each ACK information in the HARQ codebook and the PDSCH. Specifically, Method 1: The same processing method as intra-DU is used, but a method is required to inform the target cell of the correspondence between each PDU and each HARQ process ID of the source cell. Method 2: When generating the HARQ-ACK codebook, sort the codes according to HFN and SN information.

[0229] The disclosed embodiments propose a method for HARQ-ACK message feedback and data retransmission, which is mainly aimed at the L1 / L2 based inter-cell mobility scenario proposed in R18 to reduce the possibility of data loss and reduce data duplication.

[0230] In the above embodiments provided by the present disclosure, the methods provided by the embodiments of the present disclosure are introduced from the perspectives of network-side devices and terminal devices respectively.

[0231] Please refer to Figure 14, which is a schematic diagram of the structure of a communication device 1 provided in an embodiment of the present disclosure. The communication device 1 shown in Figure 14 may include a transceiver module 11 and a processing module. The transceiver module may include a sending module and / or a receiving module. The sending module is used to implement a sending function, and the receiving module is used to implement a receiving function. The transceiver module can implement the sending function and / or the receiving function.

[0232] The communication device 1 may be a terminal device, a device within a terminal device, or a device that can be used in conjunction with a terminal device. Alternatively, the communication device 1 may be a network-side device, a device within a network-side device, or a device that can be used in conjunction with a network-side device.

[0233] Communication device 1 is configured on the network side device side:

[0234] The device includes a transceiver module 11 and a processing module 12 .

[0235] The processing module 12 is configured to determine the feedback of the terminal device on the PDSCH in response to the target cell of the network side device receiving the cell switching message sent by the terminal device, but not yet receiving the feedback information of the terminal device on the PDSCH previously sent by the source target cell of the network side device.

[0236] In some embodiments, the processing module 12 is further configured to determine whether the terminal device has received the PDSCH, or determine whether the terminal device has not received the PDSCH, or receive feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell.

[0237] In some embodiments, the transceiver module 11 is configured to, in response to determining that the terminal device has not received the PDSCH, send / retransmit the unsuccessfully transmitted data to the terminal device by the target cell of the network side device after the terminal device completes switching from the source cell to the target cell.

[0238] In some embodiments, the transceiver module 11 is configured to receive feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell, wherein the feedback information includes PDCP SN information.

[0239] In some embodiments, the transceiver module 11 is configured to send first indication information to the terminal device through the source cell or the target cell, wherein the first indication information is used to indicate the feedback information sent by the terminal device to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0240] In some embodiments, the transceiver module 11 is configured to receive feedback information sent by the terminal device to the target cell of the network side device after switching from the source cell to the target cell according to the first indication information.

[0241] In some embodiments, the transceiver module 11 is configured to receive feedback information sent by the terminal device to the target cell of the network side device when the source cell and the target cell are connected to different DUs respectively, wherein the feedback information includes PDCPSN information.

[0242] In some embodiments, the transceiver module 11 is configured to stop or continue downlink data transmission through the source cell in response to receiving a cell switching message sent by the terminal device through the target cell.

[0243] In some embodiments, the transceiver module 11 is configured to, in response to receiving a cell switching message sent by the terminal device through the target cell and determining that the terminal device completes switching from the source cell to the target cell, determine to stop downlink data transmission through the source cell.

[0244] In some embodiments, the transceiver module 11 is configured to send second indication information to the terminal device through the target cell after the terminal device completes switching from the source cell to the target cell, wherein the second indication information is used to instruct the terminal device to release resources of the source cell.

[0245] Communication device 1, configured on the terminal device side:

[0246] The device includes a transceiver module 11 and a processing module 12 .

[0247] The transceiver module 11 is configured to send a cell handover message to a target cell of a network-side device, wherein the cell handover message is used to indicate that the terminal device needs to be handed over from a source cell to a target cell;

[0248] The processing module 12 is configured to determine to execute a specific processing flow to feedback the PDSCH feedback information sent by the source cell of the network side device in response to the fact that the feedback information of the PDSCH sent by the source cell of the network side device has not been fed back.

[0249] In some embodiments, the processing module 12 is further configured to determine to cancel sending feedback information to the source cell or target cell of the network side device, or to send feedback information to the target cell of the network side device after completing the handover from the source cell to the target cell.

[0250] In some embodiments, the transceiver module 11 is further configured to, in response to the terminal device determining to cancel sending feedback information to the source cell or target cell of the network side device, after completing the switching from the source cell to the target cell, receive the unsuccessfully transmitted data sent / retransmitted by the target cell of the network side device when the default terminal device does not receive the PDSCH.

[0251] In some embodiments, the transceiver module 11 is further configured to send feedback information to a target cell of the network side device, wherein the feedback information includes PDCP SN information.

[0252] In some embodiments, the transceiver module 11 is further configured to receive first indication information sent by the network side device through the source cell or the target cell, wherein the first indication information is used to indicate feedback information sent by the terminal device to the target cell of the network side device after completing the switching from the source cell to the target cell.

[0253] In some embodiments, the transceiver module 11 is further configured to send feedback information to the target cell of the network side device after completing the handover from the source cell to the target cell according to the first indication information.

[0254] In some embodiments, the transceiver module 11 is further configured to send feedback information to the target cell of the network side device in response to the source cell and the target cell being connected to different DUs respectively, wherein the feedback information includes PDCP SN information.

[0255] In some embodiments, the transceiver module 11 is further configured to maintain or stop uplink data transmission and / or downlink data transmission with the source cell of the network side device while accessing the target cell.

[0256] In some embodiments, the transceiver module 11 is further configured to receive second indication information sent by the target cell of the network side device after the terminal device completes switching from the source cell to the target cell, wherein the second indication information is used to instruct the terminal device to release the resources of the source cell.

[0257] In some embodiments, the transceiver module 11 is further configured to stop uplink data transmission and / or downlink data transmission with the source cell of the network side device according to the second indication information while accessing the target cell while maintaining data transmission with the source cell of the network side device.

[0258] Regarding the communication device 1 in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0259] The communication device 1 provided in the above embodiment of the present disclosure achieves the same or similar beneficial effects as the information feedback methods provided in some of the above embodiments, and will not be described in detail here.

[0260] Please refer to Figure 15, which is a schematic diagram of the structure of another communication device 1000 provided in an embodiment of the present disclosure. Communication device 1000 can be a terminal device, a network-side device, a chip, a chip system, or a processor that supports the terminal device to implement the above-mentioned method, or a chip, a chip system, or a processor that supports the network-side device to implement the above-mentioned method. Communication device 1000 can be used to implement the method described in the above-mentioned method embodiment. For details, please refer to the description of the above-mentioned method embodiment.

[0261] The communication device 1000 may include one or more processors 1001. The processor 1001 may be a general-purpose processor or a dedicated processor. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control the communication device (e.g., network-side equipment, baseband chips, terminal equipment, terminal equipment chips, DU or CU, etc.), execute computer programs, and process computer program data.

[0262] Optionally, the communication device 1000 may further include one or more memories 1002, on which a computer program 1004 may be stored. The memory 1002 executes the computer program 1004 to enable the communication device 1000 to perform the method described in the above method embodiment. Optionally, the memory 1002 may also store data. The communication device 1000 and the memory 1002 may be provided separately or integrated together.

[0263] Optionally, the communication device 1000 may further include a transceiver 1005 and an antenna 1006. The transceiver 1005 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., and is configured to implement transceiver functions. The transceiver 1005 may include a receiver and a transmitter. The receiver may be referred to as a receiver or a receiving circuit, etc., and is configured to implement a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., and is configured to implement a transmitting function.

[0264] Optionally, the communication device 1000 may further include one or more interface circuits 1007. The interface circuit 1007 is configured to receive code instructions and transmit the code instructions to the processor 1001. The processor 1001 executes the code instructions to enable the communication device 1000 to perform the method described in the above method embodiment.

[0265] The communication device 1000 is a network-side device: the transceiver 1005 and the processor 1001 are used to execute Figures 3 to 13.

[0266] The communication device 1000 is a terminal device: the transceiver 1005 and the processor 1001 are used to execute Figures 3 to 13.

[0267] In one implementation, processor 1001 may include a transceiver for implementing receiving and transmitting functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing the receiving and transmitting functions may be separate or integrated. The transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or may be used for transmitting or delivering signals.

[0268] In one implementation, processor 1001 may store a computer program 1003. Computer program 1003, when executed on processor 1001, enables communication device 1000 to perform the method described in the above method embodiment. Computer program 1003 may be embedded in processor 1001, in which case processor 1001 may be implemented by hardware.

[0269] In one implementation, the communication device 1000 may include a circuit that can implement the functions of sending, receiving, or communicating in the aforementioned method embodiments. The processor and transceiver described in the present disclosure can be implemented on an integrated circuit (IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (nMetal-oxide-semiconductor, NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (bipolar junction transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0270] The communication device described in the above embodiments may be a terminal device or a network side device, but the scope of the communication device described in this disclosure is not limited thereto, and the structure of the communication device may not be limited to FIG15. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be:

[0271] (1) An independent integrated circuit (IC), or chip, or chip system or subsystem;

[0272] (2) a collection of one or more ICs, optionally including a storage component for storing data and computer programs;

[0273] (3) ASIC, such as modem;

[0274] (4) Modules that can be embedded in other devices;

[0275] (5) Receivers, terminal devices, intelligent terminal devices, cellular phones, wireless devices, handheld devices, mobile units, vehicle-mounted devices, network-side devices, cloud devices, artificial intelligence devices, etc.;

[0276] (6)Others, etc.

[0277] For the case where the communication device may be a chip or a chip system, please refer to FIG16 , which is a structural diagram of a chip provided in an embodiment of the present disclosure.

[0278] The chip 1100 includes a processor 1101 and an interface 1103. There may be one or more processors 1101, and there may be more than one interface 1103.

[0279] For the case where the chip is used to implement the functions of the terminal device in the embodiments of the present disclosure:

[0280] The interface 1103 is used to receive code instructions and transmit them to the processor.

[0281] The processor 1101 is configured to execute code instructions to perform the information feedback method as described in some of the above embodiments.

[0282] For the case where the chip is used to implement the functions of the network-side device in the embodiments of the present disclosure:

[0283] The interface 1103 is used to receive code instructions and transmit them to the processor.

[0284] The processor 1101 is configured to execute code instructions to perform the information feedback method as described in some of the above embodiments.

[0285] Optionally, the chip 1100 further includes a memory 1102 , which is used to store necessary computer programs and data.

[0286] Those skilled in the art will also appreciate that the various illustrative logical blocks and steps listed in the embodiments of the present disclosure may be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the described functionality for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present disclosure.

[0287] An embodiment of the present disclosure also provides an information feedback system, which includes the communication device as a terminal device and the communication device as a network side device in the embodiment of Figure 14 above, or the system includes the communication device as a terminal device and the communication device as a network side device in the embodiment of Figure 15 above.

[0288] The present disclosure also provides a readable storage medium having instructions stored thereon, which implement the functions of any of the above method embodiments when executed by a computer.

[0289] The present disclosure also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0290] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0291] Those skilled in the art will understand that the various numerical numbers such as first and second involved in the present disclosure are only for the convenience of description and are not used to limit the scope of the embodiments of the present disclosure, and also indicate the order of precedence.

[0292] The at least one in the present disclosure can also be described as one or more, and the multiple can be two, three, four or more, which is not limited in the present disclosure. In the embodiments of the present disclosure, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", and there is no order of precedence or size between the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0293] Depending on the context, the words "if" and "if" as used herein may be interpreted as "when" or "when" or "in response to a determination."

[0294] The correspondences shown in the tables of the present disclosure can be configured or predefined. The values ​​of the information in each table are merely examples and can be configured to other values, which are not limited by the present disclosure. When configuring the correspondences between information and parameters, it is not necessarily required to configure all the correspondences shown in each table. For example, in the tables of the present disclosure, the correspondences shown in certain rows may not be configured. For another example, appropriate deformation adjustments can be made based on the above tables, such as splitting, merging, etc. The names of the parameters shown in the titles of the above tables may also adopt other names that can be understood by the communication device, and the values ​​or representations of the parameters may also adopt other values ​​or representations that can be understood by the communication device. When implementing the above tables, other data structures may also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables or hash tables, etc.

[0295] The predefined in the present disclosure may be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0296] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0297] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0298] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. An information feedback method, characterized in that, The method is executed by a network-side device and includes: When the target cell of the network-side device receives a cell handover message sent by a terminal device and has not received feedback information on a PDSCH sent by the network-side device to a source cell by the terminal device before, determining the feedback of the terminal device on the PDSCH.

2. The method according to claim 1, wherein, The determining the feedback of the terminal device on the PDSCH includes: Determining that the terminal device has received the PDSCH, or Determining that the terminal device has not received the PDSCH, or Receiving the feedback information sent by the terminal device to the target cell of the network-side device after the terminal device has handed over from the source cell to the target cell.

3. The method according to claim 2, characterized in that, The method further includes: In response to determining that the terminal device has not received the PDSCH, after the terminal device has completed handover from the source cell to the target cell, the target cell of the network-side device sends / retransmits the data that has not been successfully transmitted to the terminal device.

4. The method according to claim 2, wherein The receiving the feedback information sent by the terminal device to the target cell of the network-side device after the terminal device has handed over from the source cell to the target cell, where the feedback information includes packet data convergence protocol (PDCP) sequence number (SN) information.

5. The method according to claim 2 or 4, characterized in that, The method further includes: Sending first indication information to the terminal device through the source cell or the target cell, where the first indication information is used to indicate the feedback information sent by the terminal device to the target cell of the network-side device after the terminal device has completed handover from the source cell to the target cell.

6. The method according to claim 5, characterized in that The receiving the feedback information sent by the terminal device to the target cell of the network-side device after the terminal device has handed over from the source cell to the target cell includes: Receiving the feedback information sent by the terminal device to the target cell of the network-side device according to the first indication information after the terminal device has handed over from the source cell to the target cell.

7. The method according to claim 2, 5 or 6, characterized in that The receiving the feedback information sent by the terminal device to the target cell of the network-side device after the terminal device has handed over from the source cell to the target cell includes: Receiving the feedback information sent by the terminal device to the target cell of the network-side device when different distributed units (DUs) are connected to the source cell and the target cell respectively, where the feedback information includes PDCP SN information.

8. The method according to any one of claims 1 to 7, characterized in that, The method further includes: In response to receiving the cell handover message sent by the terminal device through the target cell, stopping or continuing uplink data transmission and / or downlink data transmission through the source cell.

9. The method according to any one of claims 1 to 7, characterized in that, The method further includes: In response to receiving the cell handover message sent by the terminal device through the target cell and determining that the terminal device has completed handover from the source cell to the target cell, determining to stop uplink data transmission and / or downlink data transmission through the source cell.

10. The method according to any one of claims 1 to 9, characterized in that, The method further includes: After the terminal device has completed handover from the source cell to the target cell, sending second indication information to the terminal device through the target cell, where the second indication information is used to indicate the terminal device to release the resources of the source cell.

11. An information feedback method, characterized in that, The method is executed by a terminal device and includes: Sending a cell handover message to a target cell of a network-side device, where the cell handover message is used to indicate that the terminal device needs to hand over from a source cell to the target cell; In response to the existence of feedback information for a PDSCH sent by the source cell of the previous network-side device that has not been fed back, determining to execute a specific processing procedure to feed back the feedback information for the PDSCH sent by the source cell of the network-side device.

12. The method according to claim 11, wherein The determining to execute a specific procedure includes: Determining to cancel sending the feedback information to the source cell or the target cell of the network-side device, or After completing the handover from the source cell to the target cell, sending the feedback information to the target cell of the network-side device.

13. The method according to claim 12, wherein The method further includes: In response to the terminal device determining to cancel sending the feedback information to the source cell or the target cell of the network-side device, after completing the handover from the source cell to the target cell, receiving the data that has not been successfully transmitted and is sent / retransmitted by the target cell of the network-side device on the premise that the terminal device is defaulted not to receive the PDSCH.

14. The method according to claim 12, wherein The sending the feedback information to the target cell of the network-side device includes: Sending the feedback information to the target cell of the network-side device, where the feedback information includes PDCPSN information.

15. The method according to claim 12 or 14, characterized in that, Before the sending the feedback information to the target cell of the network-side device, the method further includes: Receiving first indication information sent by the network-side device through the source cell or the target cell, where the first indication information is used to indicate the feedback information that the terminal device sends to the target cell of the network-side device after completing the handover from the source cell to the target cell.

16. The method according to claim 15, wherein The method further includes: According to the first indication information, after completing the handover from the source cell to the target cell, sending the feedback information to the target cell of the network-side device.

17. The method according to claim 12, 15 or 16, characterized in that The sending the feedback information to the target cell of the network-side device includes: In response to the source cell and the target cell being respectively connected to different DUs, sending the feedback information to the target cell of the network-side device, where the feedback information includes PDCPSN information.

18. The method according to any one of claims 12 to 17, characterized in that The method further includes: While accessing the target cell, maintaining or stopping uplink data transmission and / or downlink data transmission with the source cell of the network-side device.

19. The method according to any one of claims 12 to 18, characterized in that, The method further includes: After the terminal device completes the handover from the source cell to the target cell, receiving second indication information sent by the target cell of the network-side device, where the second indication information is used to indicate that the terminal device releases the resources of the source cell.

20. The method according to claim 19, wherein The method further includes: While accessing the target cell and maintaining data transmission with the source cell of the network-side device, according to the second indication information, stopping uplink data transmission and / or downlink data transmission with the source cell of the network-side device.

21. A communication device, characterized in that, The device includes: A processing module, configured to determine the feedback of the terminal device on the PDSCH when the target cell of the network-side device has received a cell handover message sent by the terminal device and has not received the feedback information on the PDSCH sent by the source cell of the network-side device to the terminal device before.

22. A communication device, characterized in that, The apparatus includes: A transceiver module, configured to send a cell handover message to a target cell of a network-side device, where the cell handover message is used to indicate that the terminal device needs to hand over from a source cell to the target cell; A processing module, configured to determine to execute a specific processing procedure to feedback the feedback information on the PDSCH sent by the source cell of the network-side device in response to the existence of unfeedbacked feedback information on the PDSCH sent by the source cell of the network-side device before.

23. A communication device, characterized in that, The apparatus includes a processor and a memory, where a computer program is stored in the memory, and the processor executes the computer program stored in the memory to enable the apparatus to execute the method according to any one of claims 1 to 10, or the processor executes the computer program stored in the memory to enable the apparatus to execute the method according to any one of claims 11 to 20.

24. A communication device, characterized in that, It includes: A processor and an interface circuit; The interface circuit is used to receive code instructions and transmit them to the processor; The processor is used to run the code instructions to execute the method according to any one of claims 1 to 10, or is used to run the code instructions to execute the method according to any one of claims 11 to 20.

25. A computer-readable storage medium, used to store instructions, when the instructions are executed, enabling the method according to any one of claims 1 to 10 to be implemented, or when the instructions are executed, enabling the method according to any one of claims 11 to 20 to be implemented.

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