Wireless communication method, terminal device, and network device

Abstract

The present application provides a wireless communication method, a terminal device, and a network device. The method includes a step in which the terminal device performs a Layer 2 reset after successfully accessing a first cell, the first cell being a target cell for lower layer handover. It can be seen from this that if the terminal device fails to access the first cell, the terminal device does not need to perform a Layer 2 reset. Therefore, even if the terminal device fails to access the first cell but successfully accesses a second cell, if the second cell is a cell for which a Layer 2 reset does not need to be performed, the terminal device does not need to perform a Layer 2 reset, thereby avoiding unnecessary Layer 2 resets, reducing data packet retransmissions due to handover, and further improving the handover user experience.

Description

[Technical Field]

[0001] The present application relates to the field of communication technologies, and more particularly to wireless communication methods, terminal devices and network devices. [Background technology]

[0002] In related art, the switching process requires a Layer 2 (L2) reset, anchored by the packet data convergence protocol (PDCP) to ensure continuous service data transmission before and after the switching. Here, the Layer 2 reset may include clearing the radio link control (RLC) cache. With technological advances, some communication systems implement a separation between a central unit (CU) and a distributed unit (DU). One CU can manage multiple DUs. Therefore, the cell switching process may involve cases where the DU is not replaced before and after the switching. Furthermore, if the DU is not replaced before and after the switching, a Layer 2 reset does not need to be performed. Based on this, to reduce the delay caused by the switching process, some communication systems introduce a lower layer switching process (also known as Layer 1 (L1) / L2 switching) to achieve rapid switching. Summary of the Invention [Problem to be solved by the invention]

[0003] The present application provides a wireless communication method, a terminal device, and a network device. [Means for solving the problem]

[0004] In a first aspect, there is provided a wireless communication method, the method comprising: after a terminal device successfully accesses a first cell, the terminal device performing a layer 2 reset, the first cell being a target cell for lower layer switching.

[0005] In a second aspect, there is provided a wireless communication method, the method comprising: a step of transmitting, by a network device, first information to a terminal device, the first information being used to indicate whether the terminal device needs to perform a Layer 2 reset when the terminal device switches to a first cell, and, if the terminal device needs to perform a Layer 2 reset, to instruct the terminal device to perform a Layer 2 reset after successfully accessing the first cell.

[0006] In a third aspect, a terminal device is provided, comprising: an execution unit for performing a layer 2 reset after the terminal device has successfully accessed a first cell, the first cell being a target cell for lower layer switching.

[0007] In a fourth aspect, there is provided a network device, the network device including a sending unit for sending first information to a terminal device, the first information being used to indicate whether the terminal device needs to perform a Layer 2 reset when the terminal device switches to a first cell, and to instruct the terminal device to perform a Layer 2 reset after successfully accessing the first cell if the terminal device needs to perform a Layer 2 reset.

[0008] In a fifth aspect, there is provided a terminal device including a memory and a processor, the memory being adapted to store one or more computer programs, and the processor being adapted to call the computer programs in the memory and cause the terminal device to perform some or all of the steps of the method of the first aspect.

[0009] In a sixth aspect, there is provided a network device including a memory, a processor, and a transceiver, wherein the memory is used to store one or more computer programs, and the processor invokes the computer programs in the memory to cause the network device to perform some or all of the steps in the method of the second aspect.

[0010] In a seventh aspect, the present invention provides a communication system including the above terminal device and / or network device. In another possible design, the system may further include other devices that interact with the terminal device or network device in the solution according to the present invention.

[0011] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program that causes a terminal device and / or a network device to execute some or all of the steps of the methods of the above aspects.

[0012] In a ninth aspect, embodiments of the present application provide a computer program product including a non-transitory computer-readable storage medium having stored thereon a computer program operable to cause a terminal device and / or a network device to perform some or all of the steps of the method of each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0013] In a tenth aspect, an embodiment of the present application provides a chip including a memory and a processor, the processor being capable of calling and executing a computer program from the memory, thereby implementing some or all of the steps described in the methods of the above aspects.

[0014] The technical solution of the present application can avoid unnecessary Layer 2 resets, which can be analyzed specifically as follows: If a terminal device performs a Layer 2 reset before accessing a first cell, and the terminal device fails to access the first cell but successfully accesses a second cell that does not require a Layer 2 reset, the previously performed Layer 2 reset is unnecessary. This is because the second cell does not need to perform a Layer 2 reset, meaning that the terminal device and the second cell can continue transmission using the data in the previous RLC cache. However, because the RLC cache was already cleared before attempting to access the first cell, even if the terminal device receives an RLC status report sent from the second cell, the terminal device cannot continue transmitting data to the RLC of the second cell. Based on the present application, after the terminal device successfully accesses the first cell, the terminal device performs a Layer 2 reset. In other words, if access to the first cell fails, the terminal device does not perform a Layer 2 reset. Therefore, even if the terminal equipment fails to access the first cell and succeeds in accessing the second cell, the terminal equipment does not need to perform a Layer 2 reset according to the situation of the second cell, thereby avoiding unnecessary Layer 2 resets, reducing retransmission of data packets due to switching, and further improving the switching user experience. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a wireless communication system applied to an embodiment of the present application; [Figure 2] FIG. 10 is a diagram illustrating an example of protocol stack entities corresponding to four data bearers. [Figure 3] FIG. 10 is a diagram illustrating an example of a lower layer switching flow. [Figure 4] 1 is a schematic flowchart of a wireless communication method according to an embodiment of the present application; [Figure 5] 4 is a schematic flowchart of another wireless communication method according to an embodiment of the present application; [Figure 6] FIG. 1 is a schematic structural diagram of a terminal device according to an embodiment of the present application; [Figure 7] FIG. 1 is a schematic structural diagram of a network device according to an embodiment of the present application. [Figure 8] 1 is a schematic structural diagram of a device for communication according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0016] The technical solution of the present application will be described below with reference to the drawings. communication systems

[0017] 1 illustrates a wireless communication system 100 according to an embodiment of the present application. The wireless communication system 100 may include a communication device. The communication device may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120.

[0018] FIG. 1 exemplarily illustrates one network device and two terminals, and optionally, the wireless communication system 100 may include multiple network devices, and the coverage range of each network device may include other numbers of terminal devices, and the embodiments of the present application are not limited thereto.

[0019] Optionally, the wireless communication system 100 may further include other network entities, such as a network controller and a mobile management entity, although the embodiments of the present application are not limited thereto.

[0020] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as a 5th generation (5G) system or new radio (NR), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, etc. The technical solutions of the present application can also be applied to future communication systems, such as a 6th generation mobile communication system and a satellite communication system.

[0021] In the present application, a terminal device may be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user equipment. In the present application, a terminal device may refer to a device that provides voice and / or data connectivity to a user, and can be used to connect humans, objects, and machines, such as a handheld device or a vehicle-mounted device with wireless connectivity. In some embodiments, the terminal device may be a mobile phone, a tablet PC (Pad), a laptop, a palmtop computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. In some embodiments, the UE may function as a base station. For example, the UE may function as a scheduling entity and provide sidelink signals between UEs in vehicle-to-everything (V2X) or device-to-device (D2D) communications. For example, a cellular phone and a car may communicate with each other using sidelink signals. Communication between cellular phones and smart home devices occurs without the need for base stations to relay communication signals.

[0022] The network equipment in the embodiment of the present application may be equipment for communicating with terminal equipment. The network equipment may include access network equipment. The access network equipment provides communication coverage in a specific geographical area and can communicate with terminal equipment 120 located within the coverage area. The access network equipment may also be referred to as radio access network equipment, base station, etc. The access network equipment in the embodiment of the present application may be a radio access network (RAN) node (or equipment) that allows terminal equipment to access a wireless network. The access network equipment may broadly cover or be replaced with various names such as a NodeB (NodeB), evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master eNB (MeNB), secondary eNB (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, radio node, access point (AP), transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), CU, DU, positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem or chip installed within the aforementioned equipment or device.The base station may also be a mobile switching center and a device that performs the function of a base station in D2D, V2X, or machine-to-machine (M2M) communications, a network side device in a 6G network, or a device that performs the function of a base station in a future communication system. The base station may support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technologies and the specific device forms adopted by the access network equipment.

[0023] The base station may be fixed or mobile. For example, a helicopter or a drone may be configured as a mobile base station, and one or more cells may move depending on the location of the mobile base station. In another example, a helicopter or a drone may be configured as a device for communicating with another base station.

[0024] The communication devices related to the wireless communication system may include not only access network devices and terminal devices but also core network elements. The core network elements may be realized by devices, that is, the core network elements are core network devices. It should be understood that the core network devices may also be network devices.

[0025] In the embodiments of the present application, the core network element may include a network element that processes and forwards user signaling and data. For example, the core network device may include a core network access and mobility management function (AMF), a session management function (SMF), a user plane gateway, a location management function (LMF), etc. The user plane gateway may be a server that has functions such as mobility management, routing, and forwarding for user plane data, and is generally located on the network side, such as a serving gateway (SGW), a packet data network gateway (PGW), or a user plane network element functional entity (UPF). Of course, the core network may include other network elements, which will not be listed here.

[0026] In some deployments, the network equipment in the embodiments of this application may refer to a CU or a DU, or may include a CU and a DU. The gNB may further include an AAU.

[0027] The network device and the terminal device may be configured indoors or outdoors, on land, including handheld or vehicle-mounted, on water, or in the air, such as on an airplane, balloon, or satellite. The embodiments of the present application do not limit the scenario in which the network device and the terminal device are located.

[0028] It should be understood that all or part of the functionality of the communication device in this application may be realized by software functions executed on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform). CU and DU separated architecture

[0029] The separation of CU and DU is realized in some wireless communication networks (e.g., 5G communication networks). One CU can manage multiple DUs. For example, one CU can manage hundreds to thousands of DUs.

[0030] From the perspective of the communication protocol stack, the control plane entity is in the CU, and the user plane entities are in the CU and DU. Specifically, for the user plane entity, the service data adaptation protocol (SDAP) and packet data convergence protocol (PDCP) are included in the CU, and the RLC, medium access control (MAC), and physical layer (PHY) are included in the DU. Figure 2 shows an example of protocol stack entities corresponding to four data bearers. Different fillings indicate the protocol stack entities corresponding to the four data bearers, respectively.

[0031] For the CU and DU separated architecture, the cell switching flow of the terminal equipment can be divided into the following three cases (Case 1 to Case 3).

[0032] In case 1, the DUs are not switched.

[0033] For case 1, the DU serving the terminal device is not changed before and after the switchover, and the CU is also not changed. For a switchover without exchanging the DU, the RLC entities before and after the switchover are both in the same DU. See Figure 2, the RLC entities corresponding to data bearer 1 and data bearer 2 are both in the same DU. Therefore, for case 1, the terminal device after the switchover does not need to perform an RLC reset (also called Layer 2 reset). In case 2, there is no exchange of CU switching.

[0034] For case 2, the DU serving the terminal device changes before and after the switchover, but the CU remains unchanged. For switchover without exchanging the CU, the RLC entities before and after the switchover are in different DUs. Continuing with FIG. 2, the RLC entities corresponding to data bearer 3 and data bearer 4 are in different DUs. Therefore, for case 2, the terminal device needs to reset the RLC after the switchover. However, since the CU remains unchanged, there is no need to reset the PDCP. As can be seen from this, switchover without exchanging the CU is substantially similar to inter-station switchover in some communication systems (e.g., intra-eNB switchover in LTE). In case 3, the CUs are swapped.

[0035] In case 3, the DU serving the terminal device changes before and after the switchover, and the CU changes. For the switchover that replaces the CU, the RLC entities before and after the switchover are not in one DU, so the RLC needs to be reset. Furthermore, the PDCP before and after the switchover are not in the same CU, so the PDCP needs to be re-established in the target CU through interaction between CUs. As can be seen from this, the switchover that replaces the CU is substantially similar to inter-station switchover in some communication systems (e.g., inter-eNB switchover in LTE).

[0036] In the related art, the switching flow must perform Layer 2 reset or RLC reset, and PDCP is used as the anchor to realize continuous transmission of service data before and after the switching. However, according to the above analysis, if DUs are not exchanged before and after the switching, there is no need to actually reset the RLC. Therefore, in order to reduce the delay caused by the switching flow, some communication systems introduce lower layer switching flow to realize fast switching. Next, the lower layer switching will be described with reference to Figure 3. Lower layer switching

[0037] Lower layer switching may also be referred to as layer 1 (layer1, L1) / layer 2 (layer2, L2) switching.

[0038] A schematic flow chart of lower layer handover is shown in Figure 3. In Figure 3, a source cell prepares three candidate target cells, target cell 1, target cell 2 and target cell 3, for a terminal device.

[0039] The lower layer switching flow shown in FIG. 3 includes steps S310 to S340.

[0040] Step S310: the source cell and each candidate target cell prepare for handover.

[0041] Step S310 may include steps S311 to S316.

[0042] Step S311: the source cell sends a switching preparation message to the target cell 1.

[0043] Step S312: the target cell 1 sends back a switching preparation completion message to the source cell.

[0044] Step S313: the source cell sends a switching preparation message to the target cell 2.

[0045] Step S314: the target cell 2 sends back a switching preparation completion message to the source cell.

[0046] Step S315: The source cell sends a switching preparation message to the target cell 3.

[0047] Step S316: the target cell 3 sends back a switching preparation completion message to the source cell.

[0048] Step S320: the source cell sends a switching configuration message to the terminal device, which is transmitted via radio resource control (RRC) signaling.

[0049] The switching configuration message may include configuration information of all candidate target cells (target cell 1 to target cell 3).

[0050] Step S330: The terminal device performs timing advance (TA) pre-acquisition and measurement.

[0051] The terminal equipment can send a preamble to each candidate target cell respectively to obtain a TA. The TA can be notified to the terminal equipment by each target cell. Alternatively, each target cell may not notify the TA to the terminal equipment, and the TA may be stored by the source cell.

[0052] The terminal equipment may also measure each candidate target cell and obtain measurement results.

[0053] Step S340: The terminal device reports the measurement results of each candidate target cell to the source cell.

[0054] The source cell can determine a target cell to which the terminal equipment needs to switch based on the measurement result, and notify the terminal equipment via lower layer signaling. Illustratively, the method shown in FIG. 3 may include step S350, S360, or S370.

[0055] When the source cell determines that the terminal equipment switches to the target cell 1, the method shown in FIG. 3 may include step S350.

[0056] Step S350 may include steps S351 to S353.

[0057] Step S351: the source cell sends a switching command to the terminal device through L1 / L2 signaling, which is used to instruct the terminal device to switch to the target cell 1;

[0058] In step S352, the terminal device transmits uplink data to the target cell 1 and receives a confirm message transmitted from the target cell 1. Up to this point, the switching flow ends.

[0059] If the terminal equipment obtains the TA of the target cell 1 in advance and the network equipment corresponding to the target cell 1 assigns a configured grant (CG) to the terminal equipment, the terminal equipment can directly transmit uplink data. If the terminal equipment does not obtain the TA of the target cell 1 in advance or the network equipment corresponding to the target cell 1 does not assign a CG to the terminal equipment, the terminal equipment obtains uplink resources and TA through a random access process and transmits uplink data.

[0060] When the source cell determines that the terminal equipment switches to the target cell 2, the method shown in FIG. 3 may include step S360.

[0061] Step S360 may include steps S361 to S363.

[0062] Step S361: the source cell sends a switching command to the terminal device through L1 / L2 signaling, which is used to indicate that the terminal device needs to switch to the target cell 2;

[0063] In step S362, the terminal device transmits uplink data to the target cell 2 and receives a confirmation message transmitted from the target cell 2. Up to this point, the switching flow ends.

[0064] If the terminal equipment obtains the TA of the target cell 2 in advance and the network equipment corresponding to the target cell 2 allocates a CG to the terminal equipment, the terminal equipment can directly transmit uplink data. If the terminal equipment does not obtain the TA of the target cell 2 in advance or the network equipment corresponding to the target cell 2 does not allocate a CG to the terminal equipment, the terminal equipment obtains uplink resources and a TA through a random access process and transmits uplink data.

[0065] When the source cell decides that the terminal equipment should switch to the target cell 3, the method shown in FIG. 3 may include step S370.

[0066] Step S370 may include steps S371 to S373.

[0067] Step S371: the source cell sends a switching command to the terminal equipment through L1 / L2 signaling, which is used to indicate that the terminal equipment needs to switch to the target cell 3;

[0068] In step S372, the terminal device transmits uplink data to the target cell 3 and receives a confirmation message transmitted from the target cell 3. Up to this point, the switching flow ends.

[0069] If the terminal equipment obtains the TA of the target cell 3 in advance and the network equipment corresponding to the target cell 3 allocates a CG to the terminal equipment, the terminal equipment can directly transmit uplink data. If the terminal equipment does not obtain the TA of the target cell 3 in advance or the network equipment corresponding to the target cell 3 does not allocate a CG to the terminal equipment, the terminal equipment obtains uplink resources and TA through a random access process and transmits uplink data.

[0070] In the method shown in Figure 3, when the terminal equipment switches to target cell 1, it belongs to switching without replacing the DU, when the terminal equipment switches to target cell 2, it belongs to switching with replacing the DU, and when the terminal equipment switches to target cell 3, it belongs to switching with replacing the CU. Therefore, when the terminal equipment switches to target cell 1, the terminal equipment does not need to perform an L2 reset, but when the terminal equipment switches to target cell 2 or target cell 3, it needs to perform an L2 reset.

[0071] Figure 3 shows a lower layer switching flow in which a source cell decides which candidate target cell to switch a terminal device to. Similarly, lower layer switching can also be applied to a conditional switching flow. Similar to the process shown in Figure 3, in a conditional switching flow, a terminal device can obtain configuration information of one or more sub-target cells in advance and select and switch to one target cell by itself based on measurement results.

[0072] In the condition switching flow, if multiple quasi-target cells are configured in advance, the terminal device selects and accesses target cell 2, but if the access fails, it can again select and access another quasi-target cell (for example, target cell 3). In this case, to switch to target cell 2 or target cell 3, the terminal device must perform an L2 reset.

[0073] The present application optimizes the lower layer switching flow. Figure 4 is a schematic structural diagram of a wireless communication method according to an embodiment of the present application.

[0074] The method shown in Figure 4 may be performed by a terminal device. The method shown in Figure 4 includes step S410.

[0075] Step S410: After the terminal equipment successfully accesses the first cell, the terminal equipment performs a layer 2 reset.

[0076] The first cell may be a target cell of lower layer switching. For example, the first cell may be a target cell indicated by a switching command transmitted from a network device. That is, the first cell may be a target cell determined by a network device. Or, the first cell may be a target cell selected by a terminal device itself in a condition switching flow. That is, the first cell may be a target cell determined by a terminal device itself.

[0077] As described above, a Layer 2 reset performed by a terminal device can be understood as an RLC reset. An RLC reset may refer to clearing an RLC cache. For example, a Layer 2 reset may include clearing a transmitting side RLC cache and / or clearing a receiving side RLC cache.

[0078] As can be seen from step S410, after the terminal equipment successfully accesses the first cell, the terminal equipment performs a layer 2 reset, that is, if the terminal equipment fails to access the first cell, it does not need to perform a layer 2 reset.

[0079] This technical solution can avoid unnecessary Layer 2 resets, as analyzed below. If a terminal device performs a Layer 2 reset before accessing a first cell, and if the terminal device fails to access the first cell and then successfully accesses a second cell that does not require a Layer 2 reset, the previously performed Layer 2 reset is unnecessary. This means that the second cell does not need to perform a Layer 2 reset, meaning that the terminal device and the second cell can continue their interaction using the data in the previous RLC cache. However, because the RLC cache was cleared before attempting to access the first cell, it is difficult to continue transmitting data between the terminal device and the RLC of the second cell, or data must be transmitted repeatedly. For example, for uplink transmission, the RLC status report sent from the second cell may indicate that the second cell requests the retransmission of some RLC service data units (SDUs). If the RLC cache is not cleared, the terminal device can find these RLC SDUs from the RLC cache and retransmit them to the second cell. However, if the RLC cache is cleared, the terminal equipment cannot find these RLC SDUs in the RLC cache and cannot transmit them. For example, for downlink transmission, if Layer 2 reset is not performed, the terminal equipment can send an RLC status report to the second cell and request retransmission of some RLC SDUs or RLS SDU segments, thereby avoiding excessive retransmission of data. However, if Layer 2 reset is performed, excessive retransmission of data cannot be avoided based on this technical solution. In accordance with the present application, the terminal equipment performs Layer 2 reset after successfully accessing the first cell. That is, the terminal equipment does not perform Layer 2 reset if access to the first cell fails. Therefore, even if access to the first cell fails and the terminal equipment successfully accesses the second cell, the terminal equipment does not need to perform Layer 2 reset according to the status of the second cell, thereby avoiding unnecessary Layer 2 reset, reducing data packet retransmission due to handover, and further improving the handover user experience.

[0080] In some embodiments, when the terminal equipment determines that it needs to perform a layer 2 reset, the terminal equipment can perform step S410. For example, when the terminal equipment switches to the first cell, it can determine whether it needs to perform a layer 2 reset. If it does not need to perform a layer 2 reset, the terminal equipment does not perform a layer 2 reset, and if it needs to perform a layer 2 reset, the terminal equipment performs a layer 2 reset (step S410). The terminal equipment can determine whether it needs to perform a layer 2 reset based on the first information in step S405, which will be described later.

[0081] Note that whether or not a layer 2 reset needs to be performed may be determined at the cell level. That is, whether or not a terminal device needs to perform a layer 2 reset may differ depending on the cell. For example, if switching to the first cell is a switch that does not replace the DU, the terminal device does not need to perform a layer 2 reset. Alternatively, if switching to the first cell is a switch that replaces the DU but not the CU, the terminal device needs to perform a layer 2 reset. Alternatively, if switching to the first cell is a switch that replaces the CU, the terminal device needs to perform a layer 2 reset.

[0082] Whether or not to replace a DU may be one of the conditions for determining whether or not a Layer 2 reset needs to be performed (or not). The conditions for determining whether or not a Layer 2 reset needs to be performed may further include other conditions. When some or all of the conditions for determining whether or not a Layer 2 reset needs to be performed are satisfied, it can be determined that a Layer 2 reset needs to be performed. Alternatively, when some or all of the conditions for determining whether or not a Layer 2 reset needs to be performed are satisfied, it can be determined that a Layer 2 reset does not need to be performed. For example, when switching to the first cell involves replacing a DU, if the two DUs before and after the replacement can share storage space using a method such as a large-capacity transmission channel or cloud connection, the terminal device does not need to perform a Layer 2 reset.

[0083] 4 may further include step S405. Step S405 may be performed by the terminal equipment and a network equipment. The network equipment may be a network equipment corresponding to a source cell of the terminal equipment.

[0084] Step S405: the network device transmits the first information to the terminal device.

[0085] The first information may be used to indicate whether the terminal equipment needs to perform a layer 2 reset when switching to the first cell.

[0086] Based on the first information, the terminal equipment can determine whether it needs to perform a layer 2 reset when switching to the first cell, and thereby determine whether it needs to perform a layer 2 reset after successfully accessing the first cell.

[0087] In some embodiments, the first information may be indicated in an explicit manner.

[0088] Exemplarily, the first information may include a first bit, a first Boolean value, or a first enumeration value corresponding to the first cell. For example, a 0 in the first bit may indicate that a Layer 2 reset does not need to be performed to switch to the first cell, and a 1 in the first bit may indicate that a Layer 2 reset needs to be performed to switch to the first cell. Alternatively, a 1 in the first bit may indicate that a Layer 2 reset does not need to be performed to switch to the first cell, and a 0 in the first bit may indicate that a Layer 2 reset needs to be performed to switch to the first cell. For example, a “true” in the first Boolean value may indicate that a Layer 2 reset does not need to be performed to switch to the first cell, and a “false” in the first Boolean value may indicate that a Layer 2 reset needs to be performed to switch to the first cell. Alternatively, a “false” in the first Boolean value may indicate that a Layer 2 reset does not need to be performed to switch to the first cell, and a “true” in the first Boolean value may indicate that a Layer 2 reset needs to be performed to switch to the first cell. For example, the first enumeration value may indicate “a L2 reset needs to be performed” or “a L2 reset does not need to be performed.”

[0089] For example, for condition switching, the network device can divide the quasi-target cells into a first group and a second group. The first group may include one or more cells that need to perform an L2 reset, and the second group may include one or more cells that do not need to perform an L2 reset. One or more cells may be quasi-target cells of the terminal device.

[0090] In some embodiments, the first information may be indicated in an implicit manner.

[0091] For example, the first information may be indicated by a condition switching condition of the first cell, and the terminal device may determine whether to perform an L2 reset for the first cell based on the condition switching condition configured by the network device for the first cell.

[0092] Selectably, when an L2 reset needs to be performed on the first cell, the network device can set the condition switching condition of the first cell to a first condition that is difficult to satisfy, and when an L2 reset does not need to be performed on the first cell, the network device can set the condition switching condition of the first cell to a second condition that is easy to satisfy. Selectably, the first condition may include the RSRP of the first cell reaching a first value and the first cell satisfying the condition switching condition, and the second condition may include the RSRP of the first cell reaching a second value and the first cell satisfying the condition switching condition, wherein the first value is greater than the second value.

[0093] Optionally, the network device may configure multiple switching conditions for all quasi-target cells. Alternatively, multiple switching conditions may be configured for quasi-target cells whose frequency band is in frequency range (FR) 1. Alternatively, multiple switching conditions may be configured for quasi-target cells whose frequency band is in frequency range (FR2). The multiple switching conditions may be associated with the first information. For example, the multiple switching conditions may include the first condition and the second condition described above.

[0094] For example, the first information may indicate whether the terminal device needs to perform a Layer 2 reset based on the order of the first cell among the plurality of cells. The plurality of cells may be cells for which the terminal device can attempt lower layer switching. For example, the plurality of cells may be represented by a cell list. For the cells in the cell list, the first half may be cells that do not need to perform an L2 reset, and the second half may be cells that do need to perform an L2 reset. Alternatively, for the cells in the cell list, the first half may be cells that need to perform an L2 reset, and the second half may be cells that do not need to perform an L2 reset.

[0095] In some embodiments, the network equipment may transmit second information to the terminal equipment, the second information may include information of a plurality of cells, the plurality of cells being cells to which the terminal equipment may attempt lower layer switching.

[0096] As can be seen from the above, in the lower layer switching process, the network device or the terminal device can determine the target cell for switching based on the L1 / L2 measurement results of the terminal device. The L1 / L2 measurement results are subject to large fluctuations because they are not smoothed or filtered. The probability of switching failure based on the L1 / L2 measurement results is high. If the network device instructs the terminal device to only one cell to which lower layer switching can be attempted (e.g., a technical solution in the related art in which the switching command includes only one cell), after the cell switching fails, the terminal device will only reselect the cell and begin re-establishing the radio link. This reduces the switching success rate and lengthens the interruption time of data transmission. According to the present application, the terminal device can sequentially attempt switching to multiple cells indicated by the second information, thereby improving the switching success rate and reducing the interruption time of data transmission.

[0097] In some embodiments, the second information may be carried in a switching command. That is, the switching command may include a plurality of cells. The plurality of cells may all be cells for which the terminal equipment can perform L1 / L2 switching. The plurality of cells indicated by the switching command may all be cells that satisfy the switching conditions. That is, the L1 / L2 measurement results of the plurality of cells indicated by the switching command all satisfy the switching requirements.

[0098] In some embodiments, the second information may be carried in a switching configuration message. That is, the terminal equipment can select one cell indicated by the switching configuration message and initiate random access. Since the candidate target cell indicated by the switching configuration message is a cell that has interacted with the source cell, the terminal equipment's access to the candidate target cell indicated by the switching configuration message can also be processed according to a switching flow. Next, refer to the scenario shown in FIG. 3. According to the present application, target cell 1, target cell 2, and target cell 3 included in the switching configuration message in step S320 may all be cells to which the terminal equipment can attempt switching. This is because the switching preparation flow has been performed between the source cell and target cell 1, target cell 2, and target cell 3 in step S310.

[0099] In some embodiments, the second information may be carried in a switch indication, which may be L1 / L2 signaling, and which may be used to indicate one or more target cells.

[0100] It should be noted that the second information may be carried separately in the switching command, or may be carried in at least two of the switching command, the switching configuration message, and the switching indication.

[0101] When the second information is carried separately in the switching command, the switching command can indicate multiple cells. If the terminal device fails to access any of the multiple cells indicated by the switching command, the terminal device can perform cell reselection and RRC re-establishment.

[0102] When the second information is carried in the switching command and the switching configuration message, the switching command can indicate one or more cells, and the switching configuration message can indicate one or more cells. All cells indicated by the switching command and the switching configuration message can constitute the multiple cells indicated by the second information. For example, the switching command may include only one cell. The terminal equipment can preferentially attempt to access the cell indicated by the switching command. If access to the cell indicated by the switching command fails, the terminal equipment can select a cell indicated by the switching configuration message but not included in the switching command, and initiate random access to the selected cell. Alternatively, the switching command may include multiple cells. The terminal equipment can preferentially attempt to access multiple cells indicated by the switching command. If access to all of the multiple cells indicated by the switching command fails, the terminal equipment can select a cell indicated by the switching configuration message but not included in the switching command, and initiate random access to the selected cell.

[0103] The following description will be given taking Fig. 5 as an example. The method shown in Fig. 5 includes step S510 and step S520.

[0104] Step S510: the network device sends a switching configuration message to the terminal device.

[0105] The configuration switching message designates five cells: Cell A, Cell B, Cell C, Cell D, and Cell E.

[0106] Step S520: the network device sends a switching command to the terminal device.

[0107] The switching command points to three cells: Cell B, Cell C, and Cell E.

[0108] 5, if the terminal equipment fails to access any of cell B, cell C, and cell E, the terminal equipment can perform cell reselection and RRC re-establishment. Alternatively, if the terminal equipment fails to access any of cell B, cell C, and cell E, the terminal equipment can attempt to access cell A or cell D.

[0109] Optionally, in step S520, the switching command can indicate only one cell. For example, the one cell indicated by the switching command can be cell B. If the terminal equipment fails to attempt to access cell B, the terminal equipment can attempt to access cell A, cell C, cell D, or cell E.

[0110] In addition, for the multiple cells indicated by the second information, the terminal device can perform statistics on the switching parameters separately, or can perform statistics together with the cells in the related art. The switching parameters may include one or more of statistical information such as the number of switches, the switching delay, etc. For example, for the multiple cells indicated by the second information, the statistical information may include one or more of the following: a probability of successfully switching to a first cell among the multiple cells, a number of times that a switch to the first cell among the multiple cells is successful, a frequency of successfully switching to the first cell among the multiple cells, a probability of successfully switching to a non-first cell among the multiple cells, a number of times that a switch to a non-first cell among the multiple cells is successful, and a frequency of successfully switching to a non-first cell among the multiple cells. For example, the statistical information may include one or more of the following: the number of times that switching to a cell that does not require a layer 2 reset to be performed in a plurality of cells is successful; the probability of successful switching to a cell that does not require a layer 2 reset to be performed in a plurality of cells; the frequency of successful switching to a cell that does not require a layer 2 reset to be performed in a plurality of cells; the number of times that switching to a cell that requires a layer 2 reset to be performed in a plurality of cells is successful; the probability of successful switching to a cell that requires a layer 2 reset to be performed in a plurality of cells; and the frequency of successful switching to a cell that requires a layer 2 reset to be performed in a plurality of cells.

[0111] The terminal device can sequentially attempt to access the plurality of cells indicated by the second information based on a certain order. The access order in which the terminal device accesses the plurality of cells will be described below.

[0112] In some embodiments, the multiple cells indicated by the second information can form a cell list. The terminal device can access the corresponding cells sequentially according to the order of the cell list. That is, the terminal device can first attempt to access the first cell in the cell list. If access to the first cell fails, the terminal device can attempt to access the second cell in the cell list. If access to the second cell fails, the terminal device can attempt to access the third cell in the cell list, etc., until it attempts to access the last cell in the cell list. Continuing with reference to FIG. 5, for example, assuming that the second information is carried only in the switching command, the terminal device can attempt to access cell B, cell C, and cell E in that order. That is, the terminal device can first attempt to access cell B. If access to cell B fails, the terminal device can attempt to access cell C. If access to cell C fails, the terminal device can attempt to access cell E.

[0113] In some embodiments, the terminal equipment may preferentially attempt to switch to a cell with a higher priority among the plurality of cells indicated by the second information. For example, if a priority associated with the first cell is higher than or equal to a priority associated with the second cell, the terminal equipment may first attempt to access the first cell. If access to the first cell fails, the terminal equipment may attempt to access the second cell.

[0114] The priority associated with the first cell may be determined based on one or more of the following information: whether a Layer 2 reset needs to be performed to switch to the first cell, the signal strength of the first cell, and the order of the cells among the multiple cells included in the second information of the first cell.

[0115] For example, a priority associated with a cell that does not need to perform a layer 2 reset may be higher than a priority associated with a cell that does not need to perform a layer 2 reset. That is, based on the principle of "first attempting to access a cell that does not need to perform a layer 2 reset," the terminal equipment can first attempt to access a cell that does not need to perform a layer 2 reset, and then attempt to access a cell that does need to perform a layer 2 reset. Continuing with reference to Figure 5, if cell B and cell E are cells that do not need to perform a layer 2 reset and cell C is a cell that needs to perform a layer 2 reset, the terminal equipment can attempt to access cell B, cell E, and cell C in that order.

[0116] For example, a priority associated with a cell having a strong signal strength may be higher than a priority associated with a cell having a weak signal strength, i.e., the terminal device may attempt to access cells one by one, starting with the cells having the strongest signal strength and ending with the cells having the weakest signal strength, depending on the measured signal strength.

[0117] Also, for example, a priority associated with a cell that is earlier in the order of the multiple cells included in the second information may be higher than a priority associated with a cell that is later in the order of the multiple cells included in the second information. In other words, the terminal device can attempt to access the multiple cells in a single attempt according to the order of the multiple cells included in the second information.

[0118] The above embodiments may be implemented individually or in combination. For example, if two cells have the same priority, the terminal device may attempt to access the two cells in the order of their cell list.

[0119] In some embodiments, the terminal equipment may transmit third information to the network equipment, the third information being used to indicate that the terminal equipment did not perform a Layer 2 reset before attempting to access the first cell, or the third information being used to indicate that the terminal equipment did not perform a Layer 2 reset before successfully accessing the first cell.

[0120] Exemplarily, the third information may be carried in one or more of an RLC status report, a media access control element (MAC CE), an RRC message, or message 3 (msg3). When the third information is carried in the MAC CE, the third information may be carried in one or more bits in a MAC subheader. When the third information is carried in an RRC message, the third information may be carried in a parameter in the RRC message. When the third information is carried in msg3, the third information indicated by the physical layer can be transmitted by puncturing it at the physical layer in msg3.

[0121] Furthermore, when the third information is carried in the RLC status report, the RLC status report not only allows the terminal equipment to inform the network equipment that it did not perform a layer 2 reset before attempting to access the first cell, but also to inform the network equipment of the RLC status of the terminal equipment.

[0122] For example, if the terminal equipment has already acquired CG resources allocated by the first cell and has already acquired TA, it may transmit an RLC status report when attempting to access the first cell. If the terminal equipment successfully accesses the first cell and the network equipment knows that the terminal equipment needs to perform a Layer 2 reset in this switching flow, the network equipment can ignore the RLC status report. After the Layer 2 reset is performed, the PDCP layer can ensure continuous transmission of data packets. If the terminal equipment fails to access the first cell, the terminal equipment can continue to search for and attempt to access the next cell without performing a Layer 2 reset.

[0123] The above describes the method embodiment of the present application in detail, and the following describes the device embodiment of the present application in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so that the parts not described in detail can be referred to the previous method embodiment.

[0124] 6 is a schematic structural diagram of a terminal device 600 according to an embodiment of the present application. The terminal device 600 includes an execution unit 610.

[0125] The execution unit 610 is used to execute a layer 2 reset after the terminal equipment successfully accesses the first cell, where the first cell is the target cell of the lower layer switching.

[0126] In some embodiments, the execution unit 610 is used by the terminal device to perform a Layer 2 reset when the terminal device determines that it needs to perform a Layer 2 reset.

[0127] In some embodiments, the terminal equipment 600 is further used for the step of receiving first information, the first information being used to indicate whether the terminal equipment needs to perform a layer 2 reset when switching to the first cell.

[0128] In some embodiments, the first information indicates a condition switching condition for the first cell, and / or the first information indicates an order of a plurality of cells for the first cell, the plurality of cells being cells to which the terminal device may attempt lower layer switching.

[0129] In some embodiments, the terminal equipment 600 is further used to receive second information, the second information including information of a plurality of cells, the plurality of cells including the first cell, and the plurality of cells being cells to which the terminal equipment can attempt lower layer switching.

[0130] In some embodiments, the second information is carried in one or more of a switch configuration message, a switch command, or a switch indication.

[0131] In some embodiments, the cell to which the terminal device preferentially attempts to switch is the cell with the highest priority among the plurality of cells.

[0132] In some embodiments, the priority associated with the first cell is determined based on one or more of the following information: whether a Layer 2 reset is required to switch to the first cell; the signal strength of the first cell; and the order of the first cell among the multiple cells included in the second information of the first cell.

[0133] In some embodiments, the terminal equipment 600 is further adapted to transmit third information, the third information being adapted to indicate that the terminal equipment did not perform a layer 2 reset before attempting to access the first cell.

[0134] In some embodiments, the third information is carried in one or more of a MAC CE, an RRC message, message 3, or an RLC status report.

[0135] In an alternative embodiment, the execution unit 610 may be a processor 810. The terminal device 600 may further include a memory 820 and a transceiver 830, as specifically shown in FIG.

[0136] 7 is a diagram of a network device 700 according to an embodiment of the present application. The network device 700 includes a sending unit 710.

[0137] The sending unit 710 is used for the step of sending first information to the terminal equipment, and the first information is used to indicate whether the terminal equipment needs to perform a layer 2 reset when the terminal equipment switches to the first cell, and if the terminal equipment needs to perform a layer 2 reset, to indicate that the layer 2 reset should be performed after successfully accessing the first cell.

[0138] In some embodiments, the first information indicates a condition switching condition for the first cell. Additionally or alternatively, the first information indicates an order of a plurality of cells for the first cell, the plurality of cells being cells to which the terminal device can attempt lower layer switching.

[0139] In some embodiments, the network device 700 is further adapted to transmit second information to the terminal device, the second information including information of a plurality of cells, the plurality of cells including the first cell, the plurality of cells being cells to which the terminal device can attempt lower layer switching.

[0140] In some embodiments, the second information is carried in one or more of a switch configuration message, a switch command, or a switch indication.

[0141] In some embodiments, the cell to which the terminal device preferentially attempts to switch is the cell with the highest priority among the plurality of cells.

[0142] In some embodiments, the priority associated with the first cell is determined based on one or more of the following information: whether a Layer 2 reset is required to switch to the first cell; the signal strength of the first cell; and the order of the first cell among the multiple cells included in the second information of the first cell.

[0143] In some embodiments, the network device 700 is further adapted to receive third information, the third information being adapted to indicate that the terminal device did not perform a layer 2 reset before attempting to access the first cell.

[0144] In some embodiments, the third information is carried in one or more of a MAC CE, an RRC message, message 3, or an RLC status report.

[0145] In an alternative embodiment, the sending unit 710 may be a transceiver 830. The network device 700 may further include a processor 810 and a memory 820, as specifically shown in FIG.

[0146] FIG. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application. The dashed lines in FIG. 8 indicate that the units or modules are optional. The device 800 may be used to implement the methods described in the above method embodiments. The device 800 may be a chip, a terminal device, or a network device.

[0147] The device 800 may include one or more processors 810. The processor 810 can support the device 800 in implementing the methods described in the method embodiments above. The processor 810 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

[0148] The device 800 may further include one or more memories 820. The memories 820 may store programs that can be executed by the processor 810 to cause the processor 810 to perform the methods described in the method embodiments above. The memory 820 may be separate from the processor 810 or may be integrated into the processor 810.

[0149] The device 800 may further include a transceiver 830. The processor 810 may communicate with other devices or chips via the transceiver 830. For example, the processor 810 may transmit and receive data to and from other devices or chips via the transceiver 830.

[0150] An embodiment of the present application further provides a computer-readable storage medium for storing a program, which can be applied to a terminal or a network device according to the embodiment of the present application, and the program can cause a computer to execute the method performed by the terminal or the network device according to each embodiment of the present application.

[0151] An embodiment of the present application further provides a computer program product, which includes a program that can be applied to a terminal or a network device according to an embodiment of the present application, and causes a computer to execute a method performed by the terminal or the network device according to each embodiment of the present application.

[0152] The embodiments of the present application further provide a computer program, which is applicable to the terminal or network device according to the embodiments of the present application, and causes a computer to execute the method executed by the terminal or network device according to each embodiment of the present application.

[0153] It should be understood that in this application, the terms "system" and "network" may be interchangeable. Furthermore, the terms used in this application are used only to interpret specific embodiments of the application, and are not intended to limit the application. The terms "first," "second," "third," "fourth," etc. in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "include," "have," and any variations thereof are intended to cover a non-exclusive inclusion.

[0154] In the embodiments of the present application, the "reference" referred to may be a direct reference or an indirect reference, and may indicate an association relationship. For example, when A refers to B, it may mean that A directly refers to B, e.g., that B can be obtained by A, or that A indirectly refers to B, e.g., that A refers to C, e.g., that B can be obtained by C, and it may indicate an association relationship between A and B.

[0155] In the embodiments of the present application, "B corresponding to A" indicates that B is associated with A and B can be determined depending on A. However, determining B depending on A does not mean determining B depending only on A, but rather that B can be determined depending on A and / or other information.

[0156] In the embodiments of the present application, the term "correspondence" may indicate a direct or indirect correspondence relationship between the two, or an association relationship between the two, such as a relationship of indicating and indicated, or a relationship of configuring and configured.

[0157] In the embodiments of the present application, "predefined" or "preconfigured" may be realized by pre-storing a corresponding code, form, or format capable of instructing related information in a device (including, for example, a terminal device and a network device), and the present application does not limit the specific implementation form. For example, predefined may refer to being defined in a protocol.

[0158] In the embodiments of the present application, the "protocol" may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied to future communication systems, but the present application is not limited thereto.

[0159] In the examples of the present application, the term "and / or" simply describes the relationship between related objects and indicates that three types of relationships exist, for example, A and / or B includes three situations: only A exists, both A and B exist, and only B exists. In addition, in this specification, the symbol " / " generally indicates that the related objects before and after it have an "or" relationship.

[0160] In the embodiments of the present application, the term "comprises" may mean directly including or indirectly including. Optionally, the term "comprises" in the embodiments of the present application may be replaced with "indicates" or "used to determine." For example, "A includes B" may be replaced with "A indicates B" or "A is used to determine B."

[0161] In various embodiments of the present application, the order of the numbers of the above processes does not indicate the order of execution, and the order of execution of each process should be determined based on its function and inherent logic, and does not constitute any limitation on the implementation process of the embodiments of the present application.

[0162] It should be understood that the disclosed systems, devices, and methods may be implemented in other forms in some embodiments of the present application. For example, the device embodiments described above are merely exemplary. For example, the division of the units is merely one type of logical function division, and actual implementation may employ other division schemes. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. Furthermore, the interconnections, direct couplings, or communication connections shown or discussed may be interfaces. Indirect couplings or communication connections via devices or units may also be electrical, mechanical, or other forms.

[0163] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the means of this embodiment according to actual needs.

[0164] Furthermore, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0165] The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, all or in part may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or a part of the flows or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored on a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optics, digital subscriber line (DSL)) or wireless (e.g., infrared, radio, microwave, etc.). The computer-readable storage medium may be any available medium readable by a computer, or a data storage device, such as a server or data center, that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid state disks (SSDs)).

[0166] Although specific embodiments of the present application have been described above, the scope of protection of the present application is not limited thereto, and all modifications and substitutions that can be easily conceived by those skilled in the art without departing from the technical scope disclosed in the present application fall within the scope of protection of the present application. Therefore, the scope of protection of the present application should be in accordance with the scope of protection of the claims.

Claims

1. 1. A wireless communication method, comprising: the terminal equipment performing a layer 2 reset after the terminal equipment has successfully accessed the first cell; The wireless communication method, wherein the first cell is a target cell of lower layer switching.

2. The step of the terminal device performing a layer 2 reset includes:

2. The method of claim 1, further comprising the step of the terminal equipment performing a layer 2 reset if the terminal equipment determines that the layer 2 reset needs to be performed.

3. The method further includes receiving first information by the terminal device; 3. The method of claim 2, wherein the first information is used to indicate whether the terminal equipment needs to perform the Layer 2 reset when switching to the first cell.

4. The first information indicates a condition switching condition of the first cell, and / or the first information indicates an order of the first cell in the plurality of cells; 4. The method of claim 3, wherein the plurality of cells are cells to which the terminal equipment can attempt lower layer switching.

5. The method further includes receiving second information by the terminal device; The second information includes information of a plurality of cells, the plurality of cells including the first cell, and the plurality of cells are cells to which the terminal equipment can attempt lower layer switching. A method according to any one of claims 1 to 4.

6. 6. The method of claim 5, wherein the second information is carried in one or more of the following messages: a switch configuration message, a switch command, and a switch indication.

7. The method according to claim 5 or 6, wherein the cell to which the terminal device attempts to switch preferentially is a cell with a high priority among the plurality of cells.

8. The priority associated with the first cell is: whether a layer 2 reset needs to be performed to switch to the first cell; The signal strength of the first cell; The method of claim 7, wherein the determination is based on one or more pieces of information including the order of the plurality of cells included in the second information of the first cell.

9. The method further includes a step of transmitting third information by the terminal device; The method according to any one of claims 1 to 8, characterized in that the third information is used to indicate that the terminal equipment did not perform the Layer 2 reset before attempting to access the first cell, or the third information is used to indicate that the terminal equipment did not perform the Layer 2 reset before successfully accessing the first cell.

10. 10. The method of claim 9, wherein the third information is carried in one or more of a Media Access Control Layer Control Element (MAC CE), a Radio Resource Control (RRC) message, message 3, or a Radio Link Control (RLC) status report.

11. 1. A wireless communication method, comprising: a step of transmitting first information from a network device to a terminal device; The wireless communication method, characterized in that the first information is used to instruct whether the terminal equipment needs to perform the Layer 2 reset when switching to the first cell, and, if the terminal equipment needs to perform the Layer 2 reset, to instruct that the Layer 2 reset be performed after the terminal equipment has successfully accessed the first cell.

12. The first information indicates a condition switching condition of the first cell, and / or The method according to claim 11, wherein the first information indicates an order of a plurality of cells of the first cell, and the plurality of cells are cells to which the terminal device can attempt lower layer switching.

13. The method further includes a step of transmitting second information from the network device to the terminal device; 13. The method according to claim 11 or 12, wherein the second information includes information of a plurality of cells, the plurality of cells including the first cell, and the plurality of cells are cells to which the terminal equipment can attempt lower layer switching.

14. 14. The method of claim 13, wherein the second information is carried in one or more of the following messages: a switch configuration message, a switch command, and a switch indication.

15. The method according to claim 13 or 14, wherein the cell to which the terminal device attempts to switch preferentially is a cell with a high priority among the plurality of cells.

16. The priority associated with the first cell is: whether a layer 2 reset needs to be performed to switch to the first cell; The signal strength of the first cell; The method of claim 15, wherein the determination is based on one or more pieces of information including the order of the first cell and the order of the second information of the first cell.

17. The method further includes receiving third information by the network device; The method according to any one of claims 11 to 16, characterized in that the third information is used to indicate that the terminal equipment did not perform the Layer 2 reset before attempting to access the first cell, or the third information is used to indicate that the terminal equipment did not perform the Layer 2 reset before successfully accessing the first cell.

18. 18. The method of claim 17, wherein the third information is carried in one or more of a Media Access Control Layer Control Element (MAC CE), a Radio Resource Control (RRC) message, message 3, or a Radio Link Control (RLC) status report.

19. A terminal device, an execution unit for executing a layer 2 reset after the terminal equipment has successfully accessed the first cell; The terminal device, wherein the first cell is a target cell for lower layer switching.

20. The execution unit:

20. The terminal device according to claim 19, wherein the terminal device is used in a step of performing a layer 2 reset when the terminal device determines that it is necessary to perform the layer 2 reset.

21. Further, the method is used in the step of receiving the first information, The terminal device according to claim 20, wherein the first information is used to indicate whether the terminal device needs to perform the Layer 2 reset when switching to the first cell.

22. The first information indicates a condition switching condition of the first cell, and / or the first information indicates an order of the first cell in the plurality of cells; The terminal device according to claim 21, wherein the plurality of cells are cells to which the terminal device can attempt lower layer switching.

23. further used in the step of receiving second information, The second information includes information on a plurality of cells, the plurality of cells including the first cell, and the plurality of cells are cells to which the terminal device can attempt lower layer switching. A terminal device according to any one of claims 19 to 22.

24. The terminal device of claim 23, wherein the second information is carried in one or more of a switching configuration message, a switching command, and a switching indication.

25. 25. The terminal device according to claim 23, wherein the cell to which the terminal device attempts to switch preferentially is a cell with a high priority among the plurality of cells.

26. The priority associated with the first cell is: whether a layer 2 reset needs to be performed to switch to the first cell; The signal strength of the first cell; The terminal device according to claim 25, wherein the order is determined based on one or more pieces of information among the plurality of cells included in the second information of the first cell.

27. Further, the method is used in the step of transmitting third information, The terminal equipment according to any one of claims 19 to 26, characterized in that the third information is used to indicate that the terminal equipment did not perform the Layer 2 reset before attempting to access the first cell, or the third information is used to indicate that the terminal equipment did not perform the Layer 2 reset before successfully accessing the first cell.

28. 28. The terminal device of claim 27, wherein the third information is carried in one or more of a Media Access Control Layer Control Element (MAC CE), a Radio Resource Control (RRC) message, message 3, and a Radio Link Control (RLC) status report.

29. A network device, a transmitting unit for transmitting first information to a terminal device; The first information is used to instruct whether the terminal equipment needs to perform the Layer 2 reset when switching to the first cell, and, if the terminal equipment needs to perform the Layer 2 reset, to instruct that the Layer 2 reset be performed after the terminal equipment has successfully accessed the first cell.

30. The first information indicates a condition switching condition of the first cell, and / or The network device of claim 29, wherein the first information indicates an order of a plurality of cells of the first cell, and the plurality of cells are cells to which the terminal device can attempt lower layer switching.

31. The network device further comprises: The step of transmitting second information to the terminal device is performed, 31. The network device according to claim 29 or 30, wherein the second information includes information on a plurality of cells, the plurality of cells including the first cell, and the plurality of cells are cells to which the terminal device can attempt lower layer switching.

32. 32. The network device of claim 31, wherein the second information is carried in one or more of the following messages: a switch configuration message, a switch command, and a switch indication.

33. 33. The network device according to claim 31, wherein the cell to which the terminal device attempts to switch preferentially is a cell with a high priority among the plurality of cells.

34. The priority associated with the first cell is: whether a layer 2 reset needs to be performed to switch to the first cell; The signal strength of the first cell; The network device according to claim 33, wherein the order is determined based on one or more pieces of information among the plurality of cells included in the second information of the first cell.

35. Further, the method is used in the step of receiving third information, The network device according to any one of claims 29 to 34, characterized in that the third information is used to indicate that the terminal device did not perform the Layer 2 reset before attempting to access the first cell, or the third information is used to indicate that the terminal device did not perform the Layer 2 reset before successfully accessing the first cell.

36. 36. The network equipment of claim 35, wherein the third information is carried in one or more of a Media Access Control Layer Control Element (MAC CE), a Radio Resource Control (RRC) message, message 3, or a Radio Link Control (RLC) status report.

37. A terminal device comprising a memory and a processor, the memory being used to store a program, and the processor calling the program in the memory to cause the terminal device to execute the method according to any one of claims 1 to 10.

38. A network device comprising a memory and a processor, the memory being used to store a program, and the processor calling the program in the memory to cause the network device to execute the method according to any one of claims 11 to 19.

39. An apparatus, comprising a processor for calling a program from a memory to cause the apparatus to perform the method of any one of claims 1 to 18.

40. A chip comprising a processor that calls a program from a memory and causes a device equipped with the chip to execute the method according to any one of claims 1 to 18.

41. A computer-readable storage medium having stored thereon a program for causing a computer to execute the method according to any one of claims 1 to 18.

42. A computer program product, characterized in that it comprises a program for causing a computer to carry out the method according to any one of claims 1 to 18.

43. A computer program, characterized in that it causes a computer to carry out the method according to any one of claims 1 to 18.

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