Cell change method and device

Abstract

The invention discloses a cell change method and device. The method comprises the following steps: the terminal equipment sends a measurement result to a first network node; the terminal equipment receives an L1 signaling and / or an L2 signaling from the first network node; and the terminal device changes from a serving cell to a cell indicated by the L2 signaling and / or the L1 signaling.

Description

Method and device for cell change Technical Field

[0001] The present application relates to the field of communications. Background Art

[0002] Network-controlled mobility applies to connected terminals and can be divided into two types of mobility: cell-level mobility and beam-level mobility.

[0003] Cell-level mobility requires to be triggered by explicit RRC signaling, i.e. handover. The RRC-triggered handover mechanism requires the terminal (UE) to at least reset the MAC entity and re-establish the RLC. RRC-managed handover is supported with and without re-establishment of the Packet Data Convergence Protocol (PDCP) entity. For Data Radio Bearers (DRBs) using RLC AM mode, PDCP can re-establish together with a security key update, or initiate a data recovery procedure without a key update. For DRBs using RLC UM mode, PDCP can re-establish together with a security key update, or remain unchanged without a key update. For Signaling Radio Bearers (SRBs), PDCP can remain unchanged without a key update, discard stored PDCP PDUs / SDUs, or re-establish together with a security key update.

[0004] It should be noted that the above introduction to the technical background is merely for convenience, to provide a clear and complete description of the technical solutions of this application and to facilitate understanding by those skilled in the art. It should not be assumed that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of this application.

[0005] Summary of the Invention

[0006] When a terminal moves from the coverage area of ​​one cell to the coverage area of ​​another, a serving cell change needs to be performed at some point. Currently, serving cell changes are triggered by L3 measurements and completed by RRC signaling, with the addition of synchronized reconfiguration (Reconfiguration with Synchronisation) triggered by the change of the primary cell (PCell) and primary and secondary cells (PSCells), and the release of secondary cells (SCells) when applicable.

[0007] Inter-cell mobility can include intra-gNB-DU mobility, intra-gNB-CU inter-gNB-DU mobility, and inter-gNB-CU mobility.

[0008] The intra-gNB-DU mobility procedure is used when the UE moves from one cell to another within the same gNB-DU, or when performing an intra-cell handover. This procedure is supported by the UE Context Modification (gNB-CU initiated) procedure.

[0009] When performing an intra-gNB-DU handover (inter-cell or intra-cell), the gNB-CU provides the gNB-DU with the channel UL GTP TEID, and the gNB-DU provides the gNB-CU with a new DL GTP TEID. Until RLC is re-established, the gNB-DU continues to send UL PDCP PDUs to the gNB-CU using the previous UL GTP TEID, after which it begins using the new UL GTP TEID. Until PDCP re-establishment or PDCP data recovery occurs, the gNB-CU continues to send DL PDCP PDUs to the gNB-DU using the previous DL GTP TEID, after which it begins using the new DL GTP TEID.

[0010] The intra-gNB-CU inter-gNB-DU mobility procedure is used when the UE moves from one gNB-DU to another gNB-DU within the same gNB-CU.

[0011] Figure 1 illustrates the intra-gNB-CU inter-gNB-DU mobility process. As shown in Figure 1, the process includes:

[0012] 1. The UE sends a MeasurementReport message to the source gNB-DU.

[0013] 2. The source gNB-DU sends an UL RRC MESSAGE TRANSFER message to the gNB-CU to convey the received MeasurementReport message.

[0014] 2a. The gNB-CU may send a UE CONTEXT MODIFICATION REQUEST message to the source gNB-DU to query the latest configuration.

[0015] 2b. The source gNB-DU responds with a UE CONTEXT MODIFICATION RESPONSE message containing the complete configuration information.

[0016] 3. The gNB-CU sends a UE CONTEXT SETUP REQUEST message to the target gNB-DU to create a UE context and establish one or more data bearers. The UE CONTEXT SETUP REQUEST message includes HandoverPreparationInformation. In the case of NG-RAN sharing, the gNB-CU includes the serving PLMN ID (or, for SNPN, the serving SNPN ID).

[0017] 4. The target gNB-DU responds to the gNB-CU with the UE CONTEXT SETUP RESPONSE message.

[0018] 5. The gNB-CU sends a UE CONTEXT MODIFICATION REQUEST message to the source gNB-DU, including the generated RRC Reconfiguration message and instructing it to stop data transmission for the UE. The source gNB-DU also sends a Downlink Data Transmission Status frame to inform the gNB-CU of downlink data that was not successfully transmitted to the UE.

[0019] Note: In the case of DAPS handover, the UE CONTEXT MODIFICATION REQUEST message in step 5 may indicate the cessation of data transmission only for DRB(s) not subject to DAPS handover, or may not indicate the cessation of data transmission at all. Instead, the handover command can be conveyed to the UE using the DL RRC messaging procedure. Once the gNB-CU knows that the UE has successfully accessed the target gNB-DU, it sends a UE CONTEXT MODIFICATION REQUEST message to the source gNB-DU, indicating the cessation of UE data transmission. To this end, the source gNB-DU sends a DDDS frame to the gNB-CU regarding the unsuccessful downlink data transmission.

[0020] 6. The source gNB-DU forwards the received RRCReconfiguration message to the UE.

[0021] 7. The source gNB-DU responds to the gNB-CU with a UE CONTEXT MODIFICATION RESPONSE message.

[0022] 8. The target gNB-DU performs a random access procedure. The target gNB-DU sends a Downlink Data Transfer Status frame to inform the gNB-CU. Downlink data packets, which may include PDCP PDUs that were not successfully transmitted in the source gNB-DU, are sent from the gNB-CU to the target gNB-DU.

[0023] NOTE: Whether to start sending DL user data to the gNB-DU before or after receiving the downlink data transmission status depends on the gNB-CU implementation.

[0024] 9. The UE responds to the target gNB-DU with an RRCReconfigurationComplete message.

[0025] 10. The target gNB-DU sends an UL RRC MESSAGE TRANSFER message to the gNB-CU to communicate the received RRCReconfigurationComplete message. Downlink data packets are sent to the UE. In addition, uplink data packets are sent from the UE and forwarded to the gNB-CU via the target gNB-DU.

[0026] 11. The gNB-CU sends a UE CONTEXT RELEASE COMMAND message to the source gNB-DU.

[0027] 12. The source gNB-DU releases the UE context and responds to the gNB-CU with a UE CONTEXT RELEASE COMPLETE message.

[0028] Figure 2 illustrates the signaling flow for inter-gNB-CU mobility. As shown in Figure 2, the signaling flow includes:

[0029] 1. The source gNB initiates handover and sends a HANDOVER REQUEST via the Xn interface.

[0030] 2. The target gNB performs admission control and provides the new RRC configuration as part of the HANDOVER REQUEST ACKNOWLEDGE;

[0031] 3. The source gNB provides the RRC configuration to the UE by delivering the RRCReconfiguration message received in the HANDOVER REQUEST ACKNOWLEDGE message. The RRCReconfiguration message contains at least the cell ID and all information required to access the target cell, allowing the UE to access the target cell without reading system information. The target cell information may include beam-specific information.

[0032] 4. The UE moves the RRC connection to the target gNB and replies RRCReconfigurationComplete.

[0033] Figure 3 is a schematic diagram of the handover process within the AMF / UPF. As shown in Figure 3, the process includes:

[0034] 0. The UE context within the source gNB contains information about roaming and access restrictions, which was provided at connection establishment or at the last TA update;

[0035] 1. The source gNB configures the UE measurement process, and the UE reports according to the measurement configuration;

[0036] 2. The source gNB decides to hand over the UE based on the MeasurementReport and RRM information;

[0037] 3. The source gNB sends a Handover Request message to the target gNB, passing a transparent RRC container containing the necessary information to prepare the handover on the target side. This information includes at least the target cell ID, KgNB*, the UE's C-RNTI in the source gNB, RRM-configuration including the UE's inactive time, basic AS-configuration including antenna information and DL Carrier Frequency, DRB mapping rules applied to the UE for the current QoS flow, SIB1 from the source gNB, UE capabilities for different RATs, PDU session related information, and may include measurement information reported by the UE, including beam related information (if available). PDU session related information includes slice information and QoS flow level QoS profile. The source gNB may also request DAPS handover for one or more DRBs;

[0038] NOTE 1: After issuing a handover request, the source gNB shall not reconfigure the UE, including performing Reflective QoS flow to DRB mapping;

[0039] 4. Admission control may be performed by the target gNB. If slice information is sent to the target gNB, slice-aware admission control shall be performed. If a PDU Session is associated with an unsupported slice, the target gNB shall reject such a PDU Session.

[0040] 5. The target gNB prepares for handover with L1 / L2 and sends a HANDOVER REQUEST ACKNOWLEDGE to the source gNB, which includes the transparent container to be sent as an RRC message to the UE to perform the handover. The target gNB also indicates whether it accepts DAPS handover.

[0041] NOTE 2: Data forwarding can be initiated as soon as the source gNB receives the HANDOVER REQUEST ACKNOWLEDGE or as soon as the transmission of the HANDOVER COMMAND is initiated in the downlink.

[0042] NOTE 3: For DRBs configured with DAPS, downlink PDCP SDUs are forwarded using the SN assigned by the source gNB until the SN assignment is handed over to the target gNB in ​​step 8b. Normal data forwarding follows the definition in 9.2.3.2.3.

[0043] 6. The source gNB triggers Uu handover by sending an RRCReconfiguration message to the UE, which contains the information required to access the target cell: at least the target cell ID, the new C-RNTI, and the selected target gNB security algorithm identifier and security algorithm. It may also include a set of dedicated RACH resources, the association between RACH resources and SSBs, the association between RACH resources and UE-specific CSI-RS configuration, common RACH resources and system information of the target cell, etc.

[0044] NOTE 4: For a DRB configured with DAPS, the source gNB does not stop transmitting downlink packets until it receives the HANDOVER SUCCESS message from the target gNB in ​​step 8a.

[0045] Note 4a: CHO cannot be configured simultaneously with DAPS switching;

[0046] 7a. For DRBs configured with DAPS, the source gNB sends an EARLY STATUS TRANSFER message. The DL COUNT value conveyed in the EARLY STATUS TRANSFER message indicates the PDCP SN and HFN of the first PDCP SDU forwarded by the source gNB to the target gNB. The source gNB does not stop assigning SNs to downlink PDCP SDUs until it sends the SN STATUS TRANSFER message to the target gNB in ​​step 8b.

[0047] 7. For DRBs not configured with DAPS, the source gNB sends an SN STATUS TRANSFER message to the target gNB to convey the uplink PDCP SN receiver status and downlink PDCP SN transmitter status (i.e., for RLC AM) of the DRB to which PDCP status preservation is applied. The uplink PDCP SN receiver status includes at least the PDCP SN of the first lost UL PDCP SDU and may include a bitmap of the reception status of out-of-sequence UL PDCP SDUs that the UE needs to retransmit in the target cell, if any; the downlink PDCP SN transmitter status indicates the next PDCP SN that the target gNB should assign to the new PDCP SDU, if no PDCP SN is yet available;

[0048] NOTE 5: In case of DAPS handover, the uplink PDCP SN receiver status and downlink PDCP SN transmitter status of a DRB with RLC-AM and not configured with DAPS may be transferred via the SN STATUS TRANSFER message in step 8b instead of step 7;

[0049] NOTE 6: For DRBs configured with DAPS, the source gNB may additionally send an EARLY STATUS TRANSFER message between step 7 and step 8b to notify the discard of forwarded PDCP SDUs. The target gNB does not send forwarded downlink PDCP SDUs whose COUNT is less than the delivered DL COUNT value to the UE and discards them if no transmission has been attempted.

[0050] 8. The UE synchronizes to the target cell and completes the RRC handover procedure by sending an RRCReconfigurationComplete message to the target gNB. In the case of DAPS handover, the UE does not detach from the source cell upon receiving the RRCReconfiguration message. The UE releases the source resources and configuration and stops DL / UL reception / transmission with the source upon receiving an explicit release from the target node.

[0051] NOTE 6a: From the RAN perspective, a DAPS handover is considered complete only after the UE releases the source cell as explicitly requested by the target node. RRC is suspended and no subsequent handover or inter-RAT handover can be initiated until the source cell is released.

[0052] 8a / b. In the case of a DAP handover, the target gNB sends a HANDOVER SUCCESS message to the source gNB to notify the UE of successful access to the target cell. In response, the source gNB sends an SN STATUS TRANSFER message for the DRBs configured with DAPS. The description in step 7 applies to these DRBs, and normal data forwarding is then performed as defined in 9.2.3.2.3.

[0053] NOTE 7: If DAPS is configured, the uplink PDCP SN receiver status and downlink PDCP SN transmitter status are also conveyed in the SN STATUS TRANSFER message in step 8b for the DRB with RLC-UM;

[0054] NOTE 8: For DRBs configured with DAPS, the source gNB does not stop delivering uplink QoS flows to the UPF until it sends the SN STATUS TRANSFER message in step 8b. The target gNB does not forward the QoS flows of successfully received in-sequence uplink PDCP SDUs to the UPF until it receives the SN STATUS TRANSFER message, where the UL HFN and the first missing SN in the uplink PDCP SN receiver status indicate the start of uplink PDCP SDU delivery to the UPF. The target gNB does not deliver any uplink PDCP SDUs whose UL COUNT is lower than the provided value;

[0055] Note 9: Invalid;

[0056] 9. The target gNB sends a PATH SWITCH REQUEST message to the AMF to trigger the 5GC to switch the DL data path to the target gNB and establish the NG-C interface instance to the target gNB.

[0057] 10.5GC switches the DL data path to the target gNB. The UPF sends one or more "end marker" packets to the source gNB on the old path for each PDU session / tunnel. It can then release any U-plane / TNL resources to the source gNB.

[0058] 11.AMF acknowledges the PATH SWITCH REQUEST message with a PATH SWITCH REQUEST ACKNOWLEDGE message;

[0059] 12. Upon receiving the PATH SWITCH REQUEST ACKNOWLEDGE message from the AMF, the target gNB sends a UE CONTEXT RELEASE message to inform the source gNB of the successful handover. The source gNB may then release the radio and C-plane related resources associated with the UE context. Any ongoing data forwarding may continue.

[0060] The above describes the inter-cell mobility, ie, the cell change process in various scenarios.

[0061] The inventors discovered that when a terminal moves from the coverage area of ​​one cell to the coverage area of ​​another, it must at some point perform a serving cell change. Currently, in various scenarios, serving cell changes are triggered by L3 measurements and completed by RRC signaling, involving a complete L1 (and L2) reset. This results in longer latency, greater signaling overhead, and longer outage times than beam switching mobility.

[0062] In order to solve one or more of the above problems, embodiments of the present application provide a method and apparatus for cell change.

[0063] According to a first aspect of an embodiment of the present application, a cell change apparatus is provided, which is arranged in a terminal device, and includes: a first sending unit, which sends a measurement result to a first network node; a first receiving unit, which receives L1 signaling and / or L2 signaling from the first network node; and a first changing unit, which changes from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

[0064] According to the second aspect of an embodiment of the present application, a device for cell change is provided, which is applied to a first network node, and includes: a third receiving unit, which receives measurement results from a terminal device; and a second sending unit, which sends L1 signaling and / or L2 signaling to the terminal device to instruct the terminal device to change from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

[0065] According to a third aspect of the embodiments of the present application, a terminal device is provided, which includes the apparatus according to the first aspect of the embodiments of the present application.

[0066] According to a fourth aspect of the embodiments of the present application, a network node is provided, wherein the network node includes the apparatus according to the second aspect of the embodiments of the present application.

[0067] According to the fifth aspect of the embodiment of the present application, a communication system is provided, which includes the terminal device according to the third aspect of the embodiment of the present application and / or the network device according to the fourth aspect of the embodiment of the present application.

[0068] According to the sixth aspect of an embodiment of the present application, a method for cell change is provided, which is applied to a terminal device, and the method includes: sending measurement results to a first network node; receiving L1 signaling and / or L2 signaling from the first network node; and changing from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

[0069] According to the seventh aspect of an embodiment of the present application, a method for cell change is provided, which is applied to a first network node, and the method includes: receiving measurement results from a terminal device; and sending L1 signaling and / or L2 signaling to the terminal device to instruct the terminal device to change from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

[0070] According to the eighth aspect of the embodiment of the present application, a computer-readable program is provided, wherein when the program is executed in a cell change apparatus or terminal device, the program causes the cell change apparatus or terminal device to execute the cell change method described in the sixth aspect of the embodiment of the present application.

[0071] According to the ninth aspect of the embodiment of the present application, a storage medium storing a computer-readable program is provided, wherein the computer-readable program enables the cell change apparatus or terminal device to execute the cell change method described in the sixth aspect of the embodiment of the present application.

[0072] According to the tenth aspect of the embodiment of the present application, a computer-readable program is provided, wherein when the program is executed in a cell change device or a network node, the program causes the cell change device or the network node to perform the cell change method described in the seventh aspect of the embodiment of the present application.

[0073] According to the eleventh aspect of the embodiments of the present application, a storage medium storing a computer-readable program is provided, wherein the computer-readable program enables the cell change device or network equipment to execute the cell change method described in the seventh aspect of the embodiments of the present application.

[0074] One of the beneficial effects of the embodiments of the present application is that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0075] With reference to the following description and accompanying drawings, specific embodiments of the present application are disclosed in detail, indicating the manner in which the principles of the present application can be employed. It should be understood that the embodiments of the present application are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present application include many variations, modifications and equivalents.

[0076] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0077] It should be emphasized that the terms “include / comprising / having” when used herein refer to the presence of features, integers, steps or components, but do not preclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The elements and features described in one figure or one embodiment of the present application can be combined with the elements and features shown in one or more other figures or embodiments. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures and can be used to indicate corresponding parts used in more than one embodiment.

[0079] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0080] Figure 1 is a schematic diagram of the inter-gNB-DU mobility process within a gNB-CU.

[0081] FIG2 is a schematic diagram of the signaling process for inter-gNB-CU mobility;

[0082] FIG3 is a schematic diagram of the handover process within the AMF / UPF;

[0083] FIG4 is a schematic diagram of a communication system according to an embodiment of the present application;

[0084] FIG5 is a schematic diagram of a deployment scenario of an NG-RAN according to an embodiment of the present application;

[0085] FIG6 is a schematic diagram of an IAB deployment scenario according to an embodiment of the present application;

[0086] FIG7 is a schematic diagram of a cell change method according to Example 1 of the present application;

[0087] FIG8 is a schematic diagram of a basic signaling process of cell change (cell mobility) based on L1 signaling and / or L2 signaling according to Example 1 of the present application;

[0088] FIG9 is a schematic diagram of a cell change method according to Example 2 of the present application;

[0089] FIG10 is a schematic diagram of a cell change method according to Example 3 of the present application;

[0090] FIG11 is a schematic diagram of an apparatus for changing a cell according to Example 4 of the present application;

[0091] FIG12 is a schematic diagram of an apparatus for changing a cell according to Embodiment 5 of the present application;

[0092] 13 is a schematic block diagram of a system configuration of a terminal device according to Example 6 of the present invention;

[0093] FIG14 is a schematic block diagram of the system structure of the network node of Example 7 of the present invention. DETAILED DESCRIPTION

[0094] The above and other features of the present application will become apparent through the following description with reference to the accompanying drawings. In the description and the accompanying drawings, specific embodiments of the present application are disclosed in detail, which illustrate some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents that fall within the scope of the appended claims.

[0095] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements from the name, but do not indicate the spatial arrangement or temporal order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.

[0096] In the embodiments of this application, the singular forms "a," "the," etc. include plural forms and should be broadly understood to mean "a" or "a type" rather than being limited to "one." Furthermore, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. Furthermore, the term "according to" should be understood to mean "at least in part based on...", and the term "based on" should be understood to mean "at least in part based on...", unless the context clearly indicates otherwise.

[0097] In the embodiments of the present application, the term "communication network" or "wireless communication network" may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0098] Furthermore, communication between devices in the communication system may be carried out according to communication protocols of any stage, for example, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and future 5G, New Radio (NR), etc., and / or other currently known or future communication protocols to be developed.

[0099] In the embodiments of the present application, the term "network device" or "network node" refers to, for example, a device in a communication system that connects a user equipment to a communication network and provides services to the user equipment. Network devices or network nodes may include, but are not limited to, the following devices: "node" and / or "donor" under the IAB architecture, base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

[0100] Base stations may include, but are not limited to, NodeBs (NBs), evolved NodeBs (eNodeBs or eNBs), and 5G base stations (gNBs). They may also include remote radio heads (RRHs), remote radio units (RRUs), relays, or low-power nodes (e.g., femto, pico, etc.). The term "base station" may encompass some or all of their functions. Each base station can provide communication coverage for a specific geographic area. For example, a 5G gNB may include a gNB CU and one or more gNB DUs, where a CU / DU is a logical node within the gNB that also performs some of the gNB's functions. The term "cell" may refer to a base station and / or its coverage area, depending on the context in which the term is used. A gNB-DU supports one or more cells, and a cell is supported by only one gNB-DU.

[0101] In the embodiments of the present application, the term "user equipment" (UE) refers to, for example, a device that accesses a communication network through a network device and receives network services, and may also be referred to as "terminal equipment" (TE). A terminal device may be fixed or mobile and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and so on. For example, a terminal device under the IAB architecture served by an IAB node or an IAB host.

[0102] Among them, terminal devices may include but are not limited to the following devices: cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, cordless phones, smart phones, smart watches, digital cameras, etc.

[0103] For another example, in scenarios such as the Internet of Things (IoT), the terminal device can also be a machine or device for monitoring or measurement, including but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device-to-device (D2D) terminal, machine-to-machine (M2M) terminal, and so on.

[0104] In the embodiments of the present application, "when...", "under the circumstances of...", "for the circumstances of..." and "if..." all mean based on one or certain conditions or states, etc. In addition, these expressions can be replaced with each other.

[0105] The following describes the scenarios of the embodiments of the present application through examples, but the present application is not limited thereto.

[0106] FIG4 is a schematic diagram of a communication system according to an embodiment of the present application, which schematically illustrates a situation taking a terminal device and a network device as an example. As shown in FIG4 , a communication system 100 includes a first network node 101 and a terminal device 102. When the terminal device 102 changes cells, the first network node 101 serves as both a source network node and a target network node. Alternatively, as shown in FIG4 , the communication system 100 may further include a second network node 103. In this case, when the terminal device 102 changes cells, the first network node 101 serves as a source network node and the second network node 103 serves as a target network node.

[0107] For simplicity, FIG4 only takes one terminal device as an example for illustration.

[0108] In some embodiments, for inter-gNB cell change, i.e., inter-gNB-CU cell change, the first network node 101 and the second network node 103 are, for example, NR gNBs.

[0109] For inter-gNB-DU cell change, the first network node 101 and the second network node 103 are different gNB-DUs within the same gNB-CU;

[0110] For intra-gNB-DU cell changes, the first network node 101 and the second network node 103 are different TRPs or repeaters within the same gNB-DU; or, the first network node 101 is both the source network node and the target network node, and the source cell and the target cell are both on the first network node 101. In this case, the communication system 100 of the embodiment of the present application includes the first network node 101 and the terminal device 102.

[0111] In some embodiments, FIG4 shows an IAB network, where the terminal device 102 can be a UE or an IAB-MT:

[0112] For inter-IAB-donor-CU cell change, the first network node 101 and the second network node 103 are different IAB-donor-CUs, that is, when the terminal device 102 needs to perform a cell change, the first network node 101 is the source IAB-donor-CU and the second network node 103 is the target IAB-donor-CU;

[0113] For the inter-IAB-donor-DU cell change within an IAB-donor-CU, the first network node 101 and the second network node 103 are different IAB-donor-DUs within the same IAB-donor-CU, that is, when the terminal device 102 needs to perform a cell change, the first network node 101 is the source IAB-donor-DU and the second network node 103 is the target IAB-donor-DU;

[0114] For inter-IAB-node cell change, the communication system 100 of the embodiment of the present application includes a first network node 101 and a terminal device 102. When the terminal device 102 needs to change the cell, the first network node 101 is both the source IAB-donor-DU and the target IAB-donor-DU.

[0115] In the embodiment of the present application, existing services or services that may be implemented in the future may be carried out between the first network node 101 and / or the second network node 103 and the terminal device 102. For example, these services include but are not limited to enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.

[0116] The cell change method of the embodiment of the present application can be applied to various deployment scenarios, such as NG-RAN deployment scenarios, IAB deployment scenarios, etc.

[0117] Figure 5 is a schematic diagram of an NG-RAN deployment scenario according to an embodiment of the present application. As shown in Figure 5 , the NG-RAN includes a group of gNBs connected to the 5GC via the NG interface. gNBs can be interconnected via the Xn interface. A gNB can include a gNB-CU and one or more gNB-DUs. A gNB-CU and a gNB-DU are connected via the F1 interface, and a gNB-DU can only be connected to one gNB-CU.

[0118] Figure 6 is a schematic diagram of an IAB deployment scenario according to an embodiment of the present application. As shown in Figure 6, the NG-RAN supports IAB through an IAB-node wirelessly connected to a gNB capable of serving IAB-nodes, known as an IAB-donor. The IAB-donor consists of an IAB-donor-CU and one or more IAB-donor-DU(s).

[0119] Unless otherwise stated, all functions defined for gNB-DU are also applicable to IAB-DU and IAB-donor-DU. All functions defined for gNB-CU are also applicable to IAB-donor-CU. All functions defined for UE are also applicable to IAB-MT.

[0120] The following describes various implementations of the present application in conjunction with the accompanying drawings. These implementations are merely illustrative and are not intended to limit the present application.

[0121] Example 1

[0122] An embodiment of the present application provides a method for changing a cell, which is applied to a terminal device. For example, the method is applied to the terminal device 102 in FIG4 .

[0123] FIG7 is a schematic diagram of a cell change method according to Embodiment 1 of the present application. As shown in FIG7 , the method includes:

[0124] Step 701: Sending measurement results to a first network node;

[0125] Step 702: Receive L1 signaling and / or L2 signaling from the first network node; and

[0126] Step 703: Change from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0127] In this way, after sending the measurement results to the source network node, the terminal device changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0128] In some embodiments, the cell change (switch / change) includes at least one of a serving cell change, a special cell change, and a primary cell change (handover).

[0129] In some embodiments, the source cell and the target cell in the cell change are synchronous or asynchronous.

[0130] In some embodiments, the source cell and the target cell in the cell change are co-frequency or different-frequency.

[0131] In some embodiments, the source cell and / or the target cell in the cell change operates in FR1 or FR2.

[0132] In some embodiments, the first network node is a source network node, ie, a network node to which the source cell belongs.

[0133] In some embodiments, L1 refers to layer 1, including, for example, a physical layer;

[0134] L2 refers to layer 2, for example, including the MAC layer or MAC sublayer, the PDCP layer or PDCP sublayer, and the RLC layer or RLC sublayer;

[0135] L3 refers to layer 3, including, for example, an RRC layer.

[0136] In step 701, the terminal device sends a measurement result to the first network node, for example, including at least one of reporting the measurement result through RRC signaling, reporting the measurement result through L1 signaling, and reporting the measurement result through MAC CE.

[0137] In some embodiments, reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0138] In some embodiments, reporting the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0139] In some embodiments, reporting the measurement result through L1 signaling includes: periodically reporting the measurement result and / or reporting the measurement result based on event triggering.

[0140] In some embodiments, reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

[0141] In some embodiments, reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through a MAC CE.

[0142] In some embodiments, the MAC CE is different from the BFR MAC CE

[0143] In some embodiments, the MAC CE is periodically triggered and / or event triggered.

[0144] For example, the event includes: MAC receiving an L1 indication and / or receiving an L3 indication.

[0145] In step 702 , the terminal device receives L1 signaling and / or L2 signaling from the first network node. In step 703 , the terminal device changes from the current serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0146] For example, the terminal device receives L1 signaling from the first network node and changes from a current serving cell to a cell indicated by the L1 signaling;

[0147] For another example, the terminal device receives L2 signaling from the first network node and changes from a current serving cell to a cell indicated by the L2 signaling;

[0148] For another example, the terminal device receives L2 signaling and L1 signaling from the first network node, where the L2 signaling includes multiple indicated cells, the L1 signaling indicates one cell among the multiple cells, and the terminal device changes from the current serving cell to the cell indicated by the L1 signaling.

[0149] In some embodiments, the L1 signaling is downlink control information (DCI).

[0150] In some embodiments, the L2 signaling is a MAC CE.

[0151] In some embodiments, the L1 signaling indicates at least one of the following:

[0152] Cell information;

[0153] TCI state ID, for example, the L1 signaling reuses or indicates / updates DCI based on an existing TCI state ID;

[0154] TA information;

[0155] The UE identifier allocated by the target cell to the terminal device, such as C-RNTI;

[0156] HARQ feedback information of the L1 signaling; and

[0157] Scheduling information, for example, includes UL grant and / or DL ​​assignment in the target cell.

[0158] In some embodiments, the L2 signaling indicates at least one of the following:

[0159] Cell information;

[0160] TCI state ID, for example, the L2 signaling reuses or indicates / updates a MAC CE based on an existing TCI state ID;

[0161] TA information;

[0162] The UE identifier allocated by the target cell to the terminal device, such as C-RNTI;

[0163] HARQ feedback information of the L2 signaling; and

[0164] Scheduling information, for example, includes UL grant and / or DL ​​assignment in the target cell.

[0165] For example, the terminal device receives L2 signaling and L1 signaling from the first network node, and changes from the current service cell to the cell indicated by the L2 signaling and L1 signaling, where the L2 signaling and L1 signaling indicate different information of the same cell, for example, L1 signaling indicates the TCI state ID of the cell, and L2 signaling indicates the TA information of the cell.

[0166] In some embodiments, the change from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling includes at least one of the following:

[0167] Starting a first timer T1, where the first timer T1 is used to control a cell change process based on the L1 signaling and / or L2 signaling;

[0168] Apply the indicated configuration of the cell;

[0169] Initiate a random access process to the indicated cell;

[0170] The C-RNTI associated with the indicated cell is considered to be its own C-RNTI;

[0171] receiving a DL transmission on the cell according to the indicated scheduling information; and

[0172] Information is sent to the indicated cell or a network node to which the cell belongs, where the network node to which the cell belongs is the second network node or the first network node.

[0173] In some embodiments, the C-RNTI may have been previously configured by RRC signaling. For example, the terminal device receives configuration information of a group of cells from the first network node, and the above-mentioned RRC signaling configuration refers to the configuration corresponding to the cell indicated by the L1 signaling and / or L2 signaling in the configuration information; alternatively, the C-RNTI may also be included in the L1 / L2 signaling.

[0174] If there is only one signaling indication, then this C-RNTI is applied. If there are multiple signaling indications, then the one that arrives later is applied, or in the order of L1, L2, and L3.

[0175] In some embodiments, when the terminal device applies the configuration of the indicated cell, the terminal device considers that the handover is complete or has been successfully handed over to the indicated cell.

[0176] In some embodiments, the configuration of the cell indicated by the application includes: applying at least one of the SSB frequency, TA value and physical layer configuration of the cell.

[0177] For example, the terminal device receives configuration information of a group of cells from the first network node, where the above configuration refers to the configuration corresponding to the cells indicated by the L2 signaling and / or L1 signaling in the configuration information.

[0178] In some embodiments, when the terminal device completes the random access procedure, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

[0179] In some embodiments, the cell change is considered complete or successfully changed to the indicated cell when the terminal device receives the first DL transmission on the indicated cell, for example, when the first DL transmission is successfully received.

[0180] In some embodiments, the indicated cell is a target cell and the second network node is a target network node.

[0181] In some embodiments, the information sent by the terminal device to the cell or the second network node or the first network node indicates that the cell change is complete or indicates a successful change to the indicated cell.

[0182] In some embodiments, the sending of information to the indicated cell or the network node to which the cell belongs includes at least one of the following: carrying the information through an RRC reconfiguration completion message; indicating the information through feedback of the L1 signaling and / or L2 signaling, the feedback being generated based on the feedback information indicated by the L2 signaling and / or L1 signaling; and indicating the information through scheduling information indicated by the L1 signaling and / or L2 signaling.

[0183] In some embodiments, as shown in FIG7 , the method further includes:

[0184] Step 704: After the cell change is completed or successfully changed to the indicated cell, the terminal device starts communicating with the indicated cell and / or stops the first timer T1.

[0185] For example, the terminal device starts communicating with the indicated cell including: transmitting and receiving channels and / or signals dedicated to the terminal device, and / or transmitting and receiving channels and / or signals not dedicated to the terminal device, such as broadcast channels and paging channels.

[0186] In some embodiments, as shown in FIG7 , the method further includes:

[0187] Step 705: When the change to the indicated cell fails, the terminal device initiates a connection reestablishment process.

[0188] For example, the change to the indicated cell is considered to have failed when at least one of the following behaviors occurs:

[0189] The first timer times out;

[0190] The random access process initiated by the terminal device to the indicated cell fails or the number of failures reaches a preset number; and

[0191] The terminal device cannot apply the indicated configuration or partial configuration of the cell.

[0192] In some embodiments, as shown in FIG7 , the method further includes:

[0193] Step 706: Receive configuration information of a group of cells from the first network node. The group of cells are candidate cells for performing a cell change procedure based on L1 signaling and / or L2 signaling.

[0194] In some embodiments, the first network node implicitly indicates that the first network node supports a cell change process based on L1 signaling and / or L2 signaling. For example, when the terminal device receives configuration information of a group of cells, the terminal device believes that the first network node supports a cell change process based on L1 signaling and / or L2 signaling.

[0195] In some embodiments, the first network node further explicitly indicates that the first network node supports the cell change procedure based on L1 signaling and / or L2 signaling, for example, by indicating through a broadcast message and / or an RRC dedicated message.

[0196] In some embodiments, as shown in FIG7 , the method further includes:

[0197] Step 707: Receive broadcast information and / or RRC dedicated message including first indication information from the first network node.

[0198] In some embodiments, the first indication information indicates at least one of the following:

[0199] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0200] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0201] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0202] The first network node or the cell that sends the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

[0203] In some embodiments, as shown in FIG7 , the method further includes:

[0204] Step 708: Receive an RRC reconfiguration message from the first network node;

[0205] Step 709: Perform cell change according to the RRC reconfiguration message;

[0206] In some embodiments, steps 704 to 709 are optional steps.

[0207] In some embodiments, when a cell change procedure based on L1 / L2 signaling is used, steps 702 and 703 are performed; when a cell change procedure based on RRC signaling is used, steps 708 and 709 are performed.

[0208] In some embodiments, as described in step 706 , the terminal device further receives configuration information of a group of cells from the first network node.

[0209] Figure 8 is a schematic diagram of a basic signaling process for cell change (cell mobility) based on L1 signaling and / or L2 signaling in Example 1 of the present application. As shown in Figure 8, the basic signaling process includes: a first network node sends configuration information of a group of cells to a terminal device, that is, configures multiple candidate cells; the terminal device performs measurements; sends a measurement report to the first network node; the first network node decides to perform a cell change (dicesion on switching); generates CU-DU interface signaling; performs a dynamic switch via L1 / L2 signaling, and also performs TA (time alignment) management.

[0210] The following is an illustrative description of the cell change method in the embodiment of the present application in conjunction with a specific scenario.

[0211] For intra-DU cell changes, for example, when the source and target cells are two cells under the same gNB-DU (e.g., the first network node; in this embodiment, for intra-DU cell changes, the first network node may also be referred to as the first network element), the gNB-DU is connected to the gNB-CU via the F1 interface. Terminal data is transmitted between the gNB-CU and the gNB-DU via a tunnel, identified by the UL / DL GTP TEID. When performing an intra-gNB-DU inter-cell handover, the gNB-CU provides the gNB-DU with a new UL GTP TEID, and the gNB-DU provides the gNB-CU with a new DL GTP TEID.

[0212] In some embodiments, when performing an intra-gNB-DU inter-cell handover based on L1 / L2 signaling, the gNB-CU and gNB-DU exchange new UL / DL GTP TEIDs. This exchange can occur: before the gNB-DU provides the terminal with a set of cell configuration information; after the gNB-DU receives measurement results (after deciding to change the cell); or after the gNB-DU receives feedback from the terminal (success or positive).

[0213] In some embodiments, the new UL / DL GTP TEID starts to be used when: a cell change is successfully completed; a physical layer reconfiguration or reset or partial reset; a MAC reconfiguration or reset or partial reset; an RLC reconfiguration or reestablishment or partial reestablishment; a PDCP reconfiguration or reestablishment or partial reestablishment; PDCP data recovery; or an indication (from the terminal or the core network) is received to indicate the use of the new UL / DL GTP TEID.

[0214] In some embodiments, before this, the previous UL / DL GTP TEID is used.

[0215] For intra-gNB-CU inter-DU cell change, for example, the source cell is in gNB-DU1 (e.g., the first network node or source network node or first network element), and the target cell is in gNB-DU2 (e.g., the second network node or target network node or second network element), both gNB-DU1 and gNB-DU2 are connected to the gNB-CU via F1;

[0216] In some embodiments, the network (gNB-DU1) configures the terminal with a set of cell configuration information from the DU where these cells are located or from the CU to which DU1 is connected. This process can be requested by the source gNB-DU to the DU where these cells are located, or by the CU to which the source gNB-DU indicates the connection, and the CU requests the DU where these cells are located.

[0217] In some embodiments, before sending L1 / L2 signaling to instruct the terminal to perform a cell change, the source gNB-DU may request a cell change based on L1 / L2 signaling from the target gNB-DU via the gNB-CU. For example, the source gNB-DU may send an UL RRC MESSAGE TRANSFER message to the gNB-CU, which carries measurement results (including L1 / L2 / L3 measurement results) and / or an indication indicating a cell change based on L1 / L2 signaling; the gNB-CU may send a UE CONTEXT SETUP REQUEST message to the target gNB-DU, which carries all or part of the content included in the UL RRC MESSAGE TRANSFER message; the target gNB-DU may reply with a UE CONTEXT SETUP RESPONSE message, which includes an indication indicating a cell change based on L1 / L2 signaling and information indicated by L1 / L2 signaling (e.g., see the information about L1 / L2 signaling in the aforementioned disclosure);

[0218] In some embodiments, after the UE sends (positive or successful) feedback to the target gNB-DU, the gNB-DU sends an F1 message to the gNB-CU containing the feedback. This message may be, for example, a UL RRC MESSAGE TRANSFER message, or a new message such as a UL MOBILITY FEEDBACK message. Upon receipt of this message, the gNB-CU sends a message to the source gNB-DU, such as a UE CONTEXT RELEASE COMMAND message, to release the context of the UE.

[0219] It can be seen from the above embodiments that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0220] Example 2

[0221] An embodiment of the present application provides a method for cell change, which corresponds to the method for cell change applied to a terminal device described in Example 1. For the same or corresponding content, reference can be made to the description in Example 1.

[0222] The method is applied to a first network node. For example, the method is applied to the first network node 101 in FIG. 4 .

[0223] FIG9 is a schematic diagram of a cell change method according to Embodiment 2 of the present application. As shown in FIG9 , the method includes:

[0224] Step 901: receiving measurement results from a terminal device; and

[0225] Step 902: Send L1 signaling and / or L2 signaling to the terminal device to instruct the terminal device to change from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0226] In some embodiments, the measurement result is reported via at least one of RRC signaling, L1 signaling, and MAC CE.

[0227] In some embodiments, reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0228] In some embodiments, the reporting of the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0229] In some embodiments, reporting the measurement result through L1 signaling includes: periodic reporting of the measurement result and / or reporting based on event triggering.

[0230] In some embodiments, reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

[0231] In some embodiments, reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through a MAC CE.

[0232] In some embodiments, the MAC CE is different from the BFR MAC CE

[0233] In some embodiments, the MAC CE is periodically triggered and / or event triggered.

[0234] For example, the event includes: L1 indication and / or L3 indication.

[0235] In some embodiments, the L1 signaling is DCI, and / or the L2 signaling is MAC CE.

[0236] In some embodiments, the L1 signaling indicates at least one of the following:

[0237] Cell information;

[0238] TCI state ID;

[0239] TA information;

[0240] The UE identifier allocated by the target cell to the terminal device, such as C-RNTI;

[0241] HARQ feedback information of the L1 signaling; and

[0242] Scheduling information, for example, includes UL grant and / or DL ​​assignment in the target cell.

[0243] In some embodiments, the L2 signaling indicates at least one of the following:

[0244] Cell information;

[0245] TCI state ID;

[0246] TA information;

[0247] The UE identifier allocated by the target cell to the terminal device, such as C-RNTI;

[0248] HARQ feedback information of the L2 signaling; and

[0249] Scheduling information, for example, includes UL grant and / or DL ​​assignment in the target cell.

[0250] In some embodiments, as shown in FIG9 , the method further includes:

[0251] Step 903: The first network node decides to use a cell change procedure based on L1 signaling and / or L2 signaling or a cell change procedure based on RRC signaling.

[0252] In some embodiments, the cell change process based on L1 signaling and / or L2 signaling includes: the first network node sending L1 signaling and / or L2 signaling to the terminal device to trigger a change of the serving cell.

[0253] For example, in step 903 , if the first network node decides to use the cell change procedure based on L1 signaling and / or L2 signaling, step 902 is performed.

[0254] In some embodiments, the cell change process based on RRC signaling includes: the first network node sending an RRC reconfiguration message to the terminal device to trigger a change of the serving cell.

[0255] For example, in step 903 , if the first network node decides to use the cell change procedure based on RRC signaling, the following step 906 is performed.

[0256] In some embodiments, as shown in FIG9 , the method further includes:

[0257] Step 904: Send configuration information of a group of cells to the terminal device.

[0258] In some embodiments, as shown in FIG9 , the method further includes:

[0259] Step 905: Provide broadcast information and / or RRC dedicated message including first indication information to the terminal device.

[0260] The first indication information indicates at least one of the following:

[0261] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0262] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0263] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0264] The first network node or the cell that sends the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

[0265] The cell change procedure based on L3 signaling is, for example, a cell change procedure based on RRC signaling.

[0266] In some embodiments, the cell change process based on RRC signaling includes: the first network node sending an RRC reconfiguration message to the terminal device to trigger a change of the serving cell.

[0267] In some embodiments, as shown in FIG9 , the method further includes:

[0268] Step 906: Send an RRC reconfiguration message to the terminal device to trigger a change in the serving cell.

[0269] That is, in step 903 , if the first network node decides to use the cell change procedure based on RRC signaling, step 906 is executed.

[0270] In some embodiments, step 903 , step 904 , step 905 and step 906 are optional steps, and the execution order of step 904 and step 905 is not limited.

[0271] In some embodiments, in step 905, the indication may be sent via broadcast or via an RRC dedicated message.

[0272] In some embodiments, the RRC dedicated message explicitly or implicitly indicates support for a cell change procedure based on L1 signaling and / or L2 signaling.

[0273] In some embodiments, the RRC dedicated message implicitly indicates support for a cell change process based on L1 signaling and / or L2 signaling, including: when sending configuration information of a group of cells to the terminal device, the terminal device considers that the first network node supports a cell change process based on L1 signaling and / or L2 signaling.

[0274] That is, the first network node sends a group of cell configuration information to the terminal device, which is equivalent to implicitly indicating support for the cell change process based on L1 signaling and / or L2 signaling through an RRC dedicated message. That is, in this case, step 904 and step 905 are the same step.

[0275] It can be seen from the above embodiments that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0276] Example 3

[0277] An embodiment of the present application provides a method for cell change, which is applied to a terminal device and a first network node. It corresponds to the method for cell change applied to the terminal device described in Example 1 and the method for cell change applied to the first network node described in Example 2. The same content will not be repeated.

[0278] FIG10 is a schematic diagram of a cell change method according to Embodiment 3 of the present application, which is applied to a terminal device and a first network node. As shown in FIG10 , the method includes:

[0279] Step 1001: The terminal device sends a measurement result to the first network node;

[0280] Step 1002: The first network node sends L1 signaling and / or L2 signaling to the terminal device; and

[0281] Step 1003: The terminal device changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0282] In some embodiments, as shown in FIG10 , the method may further include:

[0283] Step 1004: The first network node sends configuration information of a group of cells to the terminal device;

[0284] Step 1005: The terminal device performs measurement;

[0285] Step 1006: The first network node decides to perform a cell change based on L1 signaling and / or L2 signaling;

[0286] Step 1007: The first network node generates L1 signaling and / or L2 signaling.

[0287] The above steps 1004, 1005, 1006 and 1007 are optional steps.

[0288] In the embodiment of the present application, the specific implementation of steps 1001-1007 can refer to the description in Example 1 and Example 2, and will not be repeated here.

[0289] It can be seen from the above embodiments that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0290] Example 4

[0291] The embodiment of the present application provides a cell change device, which is applied to a terminal device. Since the principle of solving the problem of the device is similar to that of the method in Example 1, its specific implementation can refer to the implementation of the method described in Example 1, and the same or related contents will not be repeated.

[0292] FIG11 is a schematic diagram of a cell change apparatus according to Embodiment 4 of the present application. As shown in FIG11 , the apparatus 1100 includes:

[0293] A first sending unit 1101, configured to send a measurement result to a first network node;

[0294] A first receiving unit 1102, configured to receive L1 signaling and / or L2 signaling from the first network node; and

[0295] The first changing unit 1103 is configured to change the serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0296] In some embodiments, the first sending unit 1101 reports the measurement result through at least one of RRC signaling, L1 signaling, and MAC CE.

[0297] In some embodiments, reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0298] In some embodiments, reporting the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0299] In some embodiments, reporting the measurement result through L1 signaling includes: periodically reporting the measurement result and / or reporting the measurement result based on event triggering.

[0300] In some embodiments, reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

[0301] In some embodiments, reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through a MAC CE.

[0302] In some embodiments, the MAC CE is different from the BFR MAC CE

[0303] In some embodiments, the MAC CE is periodically triggered and / or event triggered.

[0304] In some embodiments, the event includes: an L1 indication and / or an L3 indication.

[0305] In some embodiments, the L1 signaling is DCI, and / or the L2 signaling is MAC CE.

[0306] In some embodiments, the L1 signaling indicates at least one of the following:

[0307] Cell information;

[0308] TCI state ID;

[0309] TA information;

[0310] UE identifier allocated by the target cell to the terminal device;

[0311] HARQ feedback information of the L1 signaling; and

[0312] Scheduling information.

[0313] In some embodiments, the L2 signaling indicates at least one of the following:

[0314] Cell information;

[0315] TCI state ID;

[0316] TA information;

[0317] UE identifier allocated by the target cell to the terminal device;

[0318] HARQ feedback information of the L2 signaling; and

[0319] Scheduling information.

[0320] In some embodiments, the first changing unit 1103 performs at least one of the following:

[0321] Starting a first timer for controlling a cell change procedure based on the L1 signaling and / or L2 signaling;

[0322] Apply the indicated configuration of the cell;

[0323] Initiate a random access process to the indicated cell;

[0324] The C-RNTI associated with the indicated cell is considered to be its own C-RNTI;

[0325] receiving a DL transmission on the cell according to the indicated scheduling information; and

[0326] Information is sent to the indicated cell or a network node to which the cell belongs, where the network node to which the cell belongs is the second network node or the first network node.

[0327] In some embodiments, when the terminal device receives the first DL transmission on the indicated cell, the terminal device considers the cell change to be complete or successfully changed to the indicated cell.

[0328] In some embodiments, when the terminal device applies the configuration of the indicated cell, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

[0329] In some embodiments, the configuration of the cell indicated by the application includes:

[0330] At least one of the SSB frequency, TA value, and physical layer configuration of the cell is applied.

[0331] In some embodiments, when the terminal device completes the random access procedure, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

[0332] In some embodiments, the information sent by the terminal device to the cell or the network node to which the cell belongs indicates that the cell change is completed or indicates a successful change to the indicated cell.

[0333] In some embodiments, sending information to the indicated cell or the network node to which the cell belongs includes at least one of the following:

[0334] This information is carried in the RRC reconfiguration complete message;

[0335] Indicating the information through feedback of the L1 signaling and / or L2 signaling; and

[0336] The scheduling information indicated by the L1 signaling and / or L2 signaling indicates this information.

[0337] In some embodiments, after the cell change is completed or successfully changed to the indicated cell, the terminal device starts communicating with the indicated cell and / or stops the first timer.

[0338] In some embodiments, the terminal device starts communicating with the indicated cell including: sending and receiving channels and / or signals dedicated to the terminal device, and / or sending and receiving channels and / or signals not dedicated to the terminal device.

[0339] In some embodiments, when the change to the indicated cell fails, the terminal device initiates a connection re-establishment procedure.

[0340] In some embodiments, the change to the indicated cell is considered to have failed when at least one of the following occurs:

[0341] The first timer times out;

[0342] The random access process initiated by the terminal device to the indicated cell fails or the number of failures reaches a preset number; and

[0343] The terminal device cannot apply the indicated configuration or partial configuration of the cell.

[0344] In some embodiments, the apparatus further comprises:

[0345] The second receiving unit 1104 is configured to receive configuration information of a group of cells from the first network node.

[0346] In some embodiments, when the terminal device receives configuration information of a group of cells, the terminal device considers that the first network node supports a cell change procedure based on L1 signaling and / or L2 signaling.

[0347] In some embodiments, the apparatus further comprises:

[0348] The third receiving unit 1105 is configured to receive broadcast information and / or an RRC dedicated message including first indication information from the first network node.

[0349] In some embodiments, the first indication information indicates at least one of the following:

[0350] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0351] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0352] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0353] The first network node or the cell that sends the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

[0354] It can be seen from the above embodiments that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0355] Example 5

[0356] The embodiment of the present application provides a cell change device, which is applied to a first network node. Since the principle of solving the problem of the device is similar to that of the method of embodiment 1, its specific implementation can refer to the implementation of the method described in embodiment 2, and the same or related contents will not be repeated.

[0357] FIG12 is a schematic diagram of a cell change apparatus according to Embodiment 5 of the present application. As shown in FIG11 , the apparatus 1200 includes:

[0358] A fourth receiving unit 1201, which receives a measurement result from a terminal device; and

[0359] The second sending unit 1202 sends L1 signaling and / or L2 signaling to the terminal device to instruct the terminal device to change from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0360] In some embodiments, the measurement result is reported via at least one of RRC signaling, L1 signaling, and MAC CE.

[0361] In some embodiments, reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0362] In some embodiments, the reporting of the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0363] In some embodiments, reporting the measurement result through L1 signaling includes: periodic reporting of the measurement result and / or reporting based on event triggering.

[0364] In some embodiments, reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

[0365] In some embodiments, reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through a MAC CE.

[0366] In some embodiments, the MAC CE is different from the BFR MAC CE

[0367] In some embodiments, the MAC CE is periodically triggered and / or event triggered.

[0368] In some embodiments, the event includes: an L1 indication and / or an L3 indication.

[0369] In some embodiments, the L1 signaling is DCI, and / or the L2 signaling is MAC CE.

[0370] In some embodiments, the L1 signaling indicates at least one of the following:

[0371] Cell information;

[0372] TCI state ID;

[0373] TA information;

[0374] UE identifier allocated by the target cell to the terminal device;

[0375] HARQ feedback information of the L1 signaling; and

[0376] Scheduling information.

[0377] In some embodiments, the L2 signaling indicates at least one of the following:

[0378] Cell information;

[0379] TCI state ID;

[0380] TA information;

[0381] UE identifier allocated by the target cell to the terminal device;

[0382] HARQ feedback information of the L2 signaling; and

[0383] Scheduling information.

[0384] In some embodiments, the apparatus further comprises:

[0385] The decision unit 1203 is configured to decide whether to use a cell change procedure based on L1 signaling and / or L2 signaling or a cell change procedure based on RRC signaling.

[0386] In some embodiments, the cell change process based on L1 signaling and / or L2 signaling includes: the first network node sending L1 signaling and / or L2 signaling to the terminal device to trigger the change of the serving cell; and / or,

[0387] The cell change process based on RRC signaling includes: the first network node sends an RRC reconfiguration message to the terminal device to trigger a change of the serving cell.

[0388] In some embodiments, the apparatus further comprises:

[0389] The third sending unit 1204 sends configuration information of a group of cells to the terminal device.

[0390] In some embodiments, the apparatus further comprises:

[0391] The first providing unit 1205 provides broadcast information and / or RRC dedicated message including first indication information to the terminal device.

[0392] In some embodiments, the first indication information indicates at least one of the following:

[0393] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0394] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0395] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0396] The first network node or the cell that sends the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

[0397] In some embodiments, the RRC dedicated message explicitly or implicitly indicates support for a cell change procedure based on L1 signaling and / or L2 signaling.

[0398] In some embodiments, the RRC dedicated message implicitly indicates support for a cell change procedure based on L1 signaling and / or L2 signaling, including:

[0399] When sending configuration information of a group of cells to the terminal device, the terminal device considers that the first network node supports the cell change procedure based on L1 signaling and / or L2 signaling.

[0400] It can be seen from the above embodiments that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0401] Example 6

[0402] An embodiment of the present application provides a terminal device, which includes the cell change apparatus as described in Example 4.

[0403] Figure 13 is a schematic block diagram of the system architecture of a terminal device according to Embodiment 6 of the present invention. As shown in Figure 13 , terminal device 1300 may include a processor 1310 and a memory 1320; memory 1320 is coupled to processor 1310. It should be noted that this diagram is exemplary; other types of structures may be used to supplement or replace this structure to implement telecommunication or other functions.

[0404] In one embodiment, the functionality of the means for cell change may be integrated into the processor 1310 .

[0405] In some embodiments, the processor 1310 is configured to: send the measurement result to the first network node; receive L1 signaling and / or L2 signaling from the first network node; and change from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0406] In another embodiment, the cell change apparatus may be configured separately from the processor 1310 . For example, the cell change apparatus may be configured as a chip connected to the processor 1310 , and the functions of the cell change apparatus may be implemented under the control of the processor 1310 .

[0407] As shown in FIG13 , the terminal device 1300 may further include: a communication module 1330, an input unit 1340, a display 1350, and a power supply 1360. It is worth noting that the terminal device 1300 does not necessarily include all the components shown in FIG13 ; in addition, the terminal device 1300 may also include components not shown in FIG13 , and reference may be made to related art for details.

[0408] As shown in FIG. 13 , the processor 1310 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The processor 1310 receives inputs and controls the operations of various components of the terminal device 1300 .

[0409] Memory 1320 may be, for example, one or more of a cache, flash memory, a hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store various data and may also store programs for executing related information. Processor 1310 may execute the programs stored in memory 1320 to implement information storage or processing. The functions of other components are similar to those of existing devices and are not further described here. Each component of terminal device 1300 may be implemented using dedicated hardware, firmware, software, or a combination thereof without departing from the scope of the present invention.

[0410] It can be seen from the above embodiments that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0411] Example 7

[0412] An embodiment of the present invention provides a network node, which includes the cell change device as described in Example 5.

[0413] Figure 14 is a schematic block diagram of the system configuration of a network node according to Embodiment 7 of the present invention. As shown in Figure 14 , network node 1400 may include a processor 1410 and a memory 1420; memory 1420 is coupled to processor 1410. Memory 1420 can store various data and also stores an information processing program 1430. This program 1430 is executed under the control of processor 1410 to receive various information sent by terminal devices and to send various information to terminal devices.

[0414] In one embodiment, the functionality of the means for cell change may be integrated into the processor 1410 .

[0415] In some embodiments, the processor 1410 is configured to: receive measurement results from the terminal device; and send L1 signaling and / or L2 signaling to the terminal device to instruct the terminal device to change from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling.

[0416] In another embodiment, the cell change apparatus may be configured separately from the processor 1410 . For example, the cell change apparatus may be configured as a chip connected to the processor 1410 , and the functions of the cell change apparatus may be implemented under the control of the processor 1410 .

[0417] In addition, as shown in Figure 14, network node 1400 may further include: a transceiver 1440 and an antenna 1450; wherein, the functions of the above components are similar to those in the prior art and are not further described here. It is worth noting that network device 1400 does not necessarily include all the components shown in Figure 14; in addition, network node 1400 may also include components not shown in Figure 14, and reference may be made to the prior art.

[0418] It can be seen from the above embodiments that after the terminal device sends the measurement results to the source network node, it changes from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling according to the L1 signaling and / or L2 signaling received from the source network node, thereby providing an effective mechanism for implementing the L1 / L2-based cell change process, which can reduce latency, signaling overhead and interruption time.

[0419] Example 8

[0420] The embodiment of the present application provides a communication system, including the terminal device according to embodiment 6 and / or the network node according to embodiment 7. For specific content, please refer to the description in embodiment 16 and embodiment 17.

[0421] For example, the structure of the communication system can refer to Figure 4. As shown in Figure 4, the communication system 100 includes a first network node 101 and a terminal device 102. The terminal device 102 can be the same as the terminal device recorded in Example 6, and / or, the first network node 101 can be the same as the network node recorded in Example 7. The repeated content will not be repeated.

[0422] The above devices and methods of the present application can be implemented by hardware or by a combination of hardware and software. The present application relates to such a computer-readable program that, when executed by a logic component, enables the logic component to implement the devices or components described above, or enables the logic component to implement the various methods or steps described above. The logic component is, for example, a field programmable logic component, a microprocessor, a processor used in a computer, etc. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0423] The method / device described in conjunction with the embodiments of the present application can be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams shown in Figure 11 and / or one or more combinations of functional block diagrams can correspond to various software modules of a computer program flow or to various hardware modules. These software modules can correspond to the various steps shown in Figure 7, respectively. These hardware modules can be implemented by solidifying these software modules, for example, using a field programmable gate array (FPGA).

[0424] The software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0425] One or more of the functional blocks and / or one or more combinations of functional blocks described in FIG11 may be implemented as a 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 any suitable combination thereof for performing the functions described in this application. One or more of the functional blocks and / or one or more combinations of functional blocks described in FIG11 may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0426] The present application has been described above in conjunction with specific embodiments. However, those skilled in the art should understand that these descriptions are merely illustrative and are not intended to limit the scope of protection of the present application. Those skilled in the art may make various modifications and variations to the present application based on the spirit and principles of the present application, and such modifications and variations are also within the scope of the present application.

[0427] According to various implementations disclosed in the examples of this application, the following notes are also disclosed:

[0428] Note 1

[0429] 1. A cell change device, the device being provided in a terminal device, comprising:

[0430] a first sending unit, configured to send the measurement result to the first network node;

[0431] a first receiving unit configured to receive L1 signaling and / or L2 signaling from the first network node; and

[0432] A first changing unit is configured to change from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

[0433] 2. The device according to Note 1, wherein:

[0434] The first sending unit reports the measurement result through at least one of RRC signaling, L1 signaling and MAC CE.

[0435] 3. The device according to Note 2, wherein:

[0436] Reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0437] 4. The device according to Note 2, wherein:

[0438] Reporting the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0439] 5. The device according to Note 2 or 4, wherein:

[0440] Reporting the measurement result through L1 signaling includes: periodically reporting the measurement result and / or reporting the measurement result based on event triggering.

[0441] 6. The device according to Note 2, wherein:

[0442] Reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

[0443] 7. The device according to Note 2, wherein:

[0444] Reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through one MAC CE.

[0445] 8. The device according to Note 2 or 7, wherein:

[0446] The MAC CE is different from the BFR MAC CE

[0447] 9. The device according to Note 2, 7 or 8, wherein:

[0448] The MAC CE is periodically triggered and / or event triggered

[0449] 10. The device according to Note 9, wherein:

[0450] The event includes: L1 indication and / or L3 indication.

[0451] 11. The device according to item 1, wherein:

[0452] The L1 signaling is DCI, and / or the L2 signaling is MAC CE.

[0453] 12. The apparatus according to note 1 or 11, wherein the L1 signaling indicates at least one of the following:

[0454] Cell information;

[0455] TCI state ID;

[0456] TA information;

[0457] The UE identifier allocated by the target cell to the terminal device;

[0458] HARQ feedback information of the L1 signaling; and

[0459] Scheduling information.

[0460] 13. The apparatus according to note 1 or 11, wherein the L2 signaling indicates at least one of the following:

[0461] Cell information;

[0462] TCI state ID;

[0463] TA information;

[0464] The UE identifier allocated by the target cell to the terminal device;

[0465] HARQ feedback information of the L2 signaling; and

[0466] Scheduling information.

[0467] 14. The apparatus according to Supplement 1, wherein the first changing unit performs at least one of the following:

[0468] Starting a first timer for controlling a cell change procedure based on the L1 signaling and / or L2 signaling;

[0469] applying the indicated configuration of the cell;

[0470] Initiating a random access procedure to the indicated cell;

[0471] Considering that the indicated C-RNTI associated with the cell is its own C-RNTI;

[0472] receiving a DL transmission on the cell according to the indicated scheduling information; and

[0473] Information is sent to the indicated cell or a network node to which the cell belongs.

[0474] 14a. The device according to Note 14, wherein:

[0475] When the terminal device receives the first DL transmission on the indicated cell, the terminal device considers that the cell change is complete or has been successfully changed to the indicated cell.

[0476] 15. The device according to Note 14, wherein:

[0477] When the terminal device applies the configuration of the indicated cell, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

[0478] 16. The apparatus according to note 14 or 15, wherein the configuration of the cell indicated by the application comprises:

[0479] At least one of the SSB frequency, TA value, and physical layer configuration of the cell is applied.

[0480] 17. The device according to Note 14, wherein:

[0481] When the terminal device completes the random access procedure, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

[0482] 18. The device according to Note 14, wherein:

[0483] The information sent by the terminal device to the cell or the network node to which the cell belongs indicates that the cell change is complete or indicates a successful change to the indicated cell.

[0484] 19. The apparatus according to note 14 or 18, wherein the sending of information to the indicated cell or the network node to which the cell belongs comprises at least one of the following:

[0485] Carrying the information via an RRC reconfiguration complete message;

[0486] Indicating the information through feedback of the L1 signaling and / or L2 signaling; and

[0487] The scheduling information indicated by the L1 signaling and / or L2 signaling indicates the information.

[0488] 20. The device according to any one of Notes 1, 14-19, wherein:

[0489] After the cell change is completed or the cell is successfully changed to the indicated cell, the terminal device starts communicating with the indicated cell and / or stops the first timer.

[0490] 21. The device according to Note 20, wherein:

[0491] The terminal device starts communicating with the indicated cell, including: sending and receiving channels and / or signals dedicated to the terminal device, and / or sending and receiving channels and / or signals not dedicated to the terminal device.

[0492] 22. The device according to Note 1 or 14, wherein:

[0493] When the change to the indicated cell fails, the terminal device initiates a connection reestablishment procedure.

[0494] 23. The apparatus according to note 22, wherein the change to the indicated cell is considered to have failed when at least one of the following actions occurs:

[0495] The first timer times out;

[0496] The random access process initiated by the terminal device to the indicated cell fails or the number of failures reaches a preset number; and

[0497] The terminal device is unable to apply the indicated configuration or partial configuration of the cell.

[0498] 24. The device according to any one of Notes 1 to 23, further comprising:

[0499] A second receiving unit is configured to receive configuration information of a group of cells from the first network node.

[0500] 25. The device according to Note 1 or 24,

[0501] When the terminal device receives configuration information of a group of cells, the terminal device considers that the first network node supports a cell change procedure based on L1 signaling and / or L2 signaling.

[0502] 26. The apparatus according to claim 1, 24 or 25, further comprising:

[0503] A third receiving unit is configured to receive broadcast information and / or an RRC dedicated message including first indication information from the first network node.

[0504] 27. The method according to Note 26, wherein the first indication information indicates at least one of the following:

[0505] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0506] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0507] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0508] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling. 1328. A cell change apparatus, applied to a first network node, comprising:

[0509] a fourth receiving unit configured to receive a measurement result from the terminal device; and

[0510] A second sending unit sends L1 signaling and / or L2 signaling to the terminal device to instruct the terminal device to change from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

[0511] 1429. The device according to note 1328, wherein:

[0512] The measurement result is reported through at least one of RRC signaling, L1 signaling and MAC CE.

[0513] 30. The device according to note 1429, wherein:

[0514] Reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0515] 31. The device according to note 1429, wherein:

[0516] The reporting of the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0517] 32. The device according to note 1429 or 31, wherein:

[0518] Reporting the measurement result through L1 signaling includes: periodic reporting of the measurement result and / or reporting based on event triggering.

[0519] 33. The device according to note 1429, wherein:

[0520] The reporting of the measurement result through the MAC CE includes: reporting available candidate beams through the BFR MAC CE triggered by beam failure.

[0521] 34. The device according to Note 29, wherein:

[0522] Reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether an available beam exists, and the number of available beams through one MAC CE.

[0523] 35. The device according to Note 29 or 34, wherein:

[0524] The MAC CE is different from the BFR MAC CE

[0525] 36. The device according to Note 29, 34 or 35, wherein:

[0526] The MAC CE is periodically triggered and / or event triggered

[0527] 37. The device according to Note 36, wherein:

[0528] The event includes: L1 indication and / or L3 indication.

[0529] 38. The device according to note 1328, wherein:

[0530] The L1 signaling is DCI, and / or the L2 signaling is MAC CE.

[0531] 39. The apparatus according to note 1328 or 38, wherein the L1 signaling indicates at least one of the following:

[0532] Cell information;

[0533] TCI state ID;

[0534] TA information;

[0535] The UE identifier allocated by the target cell to the terminal device;

[0536] HARQ feedback information of the L1 signaling; and

[0537] Scheduling information.

[0538] 40. The apparatus according to note 1328 or 38, wherein the L2 signaling indicates at least one of the following:

[0539] Cell information;

[0540] TCI state ID;

[0541] TA information;

[0542] The UE identifier allocated by the target cell to the terminal device;

[0543] HARQ feedback information of the L2 signaling; and

[0544] Scheduling information.

[0545] 41. The device according to note 1328, wherein the device further comprises:

[0546] A decision unit is configured to decide whether to use a cell change procedure based on L1 signaling and / or L2 signaling or a cell change procedure based on RRC signaling.

[0547] 42. The device according to Note 41, wherein:

[0548] The cell change process based on L1 signaling and / or L2 signaling includes: the first network node sending L1 signaling and / or L2 signaling to the terminal device to trigger the change of the serving cell; and / or,

[0549] The cell change process based on RRC signaling includes: the first network node sends an RRC reconfiguration message to the terminal device to trigger a change of the serving cell.

[0550] 43. The device according to note 1328, wherein the device further comprises:

[0551] A third sending unit sends configuration information of a group of cells to the terminal device.

[0552] 44. The device according to note 1328 or 43, wherein the device further comprises:

[0553] A first providing unit provides broadcast information and / or RRC dedicated message including first indication information to the terminal device.

[0554] 45. The apparatus according to note 44, wherein the first indication information indicates at least one of the following:

[0555] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0556] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0557] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0558] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

[0559] 46. ​​The device according to Note 44, wherein:

[0560] The RRC dedicated message explicitly or implicitly indicates support for a cell change procedure based on L1 signaling and / or L2 signaling.

[0561] 47. The apparatus according to note 46, wherein the RRC dedicated message implicitly indicates support for a cell change procedure based on L1 signaling and / or L2 signaling, comprising:

[0562] When sending configuration information of a group of cells to the terminal device, the terminal device considers that the first network node supports a cell change procedure based on L1 signaling and / or L2 signaling.

[0563] 48. A terminal device, comprising the apparatus described in any one of Notes 1-27.

[0564] 49. A network node, comprising the apparatus described in any one of Notes 1328-47.

[0565] 50. A communication system, comprising the terminal device described in Note 48 and / or the network node described in Note 49.

[0566] Note 2

[0567] 1. A method for changing a cell, the method being applied to a terminal device, the method comprising:

[0568] Sending the measurement result to the first network node;

[0569] receiving L1 signaling and / or L2 signaling from the first network node; and

[0570] The serving cell is changed to the cell indicated by the L2 signaling and / or L1 signaling.

[0571] 2. The method according to Note 1, wherein the sending the measurement result to the first network node comprises:

[0572] At least one of reporting the measurement result through RRC signaling, reporting the measurement result through L1 signaling, and reporting the measurement result through MAC CE.

[0573] 3. The method according to Note 2, wherein:

[0574] Reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0575] 4. The method according to Note 2, wherein:

[0576] Reporting the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0577] 5. The method according to Note 2 or 4, wherein:

[0578] Reporting the measurement result through L1 signaling includes: periodically reporting the measurement result and / or reporting the measurement result based on event triggering.

[0579] 6. The method according to Note 2, wherein:

[0580] Reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

[0581] 7. The method according to Note 2, wherein:

[0582] Reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through one MAC CE.

[0583] 8. The method according to Note 2 or 7, wherein:

[0584] The MAC CE is different from the BFR MAC CE.

[0585] 9. The method according to Note 2, 7 or 8, wherein:

[0586] The MAC CE is periodically triggered and / or event triggered.

[0587] 10. The method according to Note 9, wherein:

[0588] The event includes: L1 indication and / or L3 indication.

[0589] 11. The method according to item 1, wherein:

[0590] The L1 signaling is DCI, and / or the L2 signaling is MAC CE.

[0591] 12. The method according to Note 1 or 11, wherein the L1 signaling indicates at least one of the following:

[0592] Cell information;

[0593] TCI state ID;

[0594] TA information;

[0595] The UE identifier allocated by the target cell to the terminal device;

[0596] HARQ feedback information of the L1 signaling; and

[0597] Scheduling information.

[0598] 13. The method according to Note 1 or 11, wherein the L2 signaling indicates at least one of the following:

[0599] Cell information;

[0600] TCI state ID;

[0601] TA information;

[0602] The UE identifier allocated by the target cell to the terminal device;

[0603] HARQ feedback information of the L2 signaling; and

[0604] Scheduling information.

[0605] 14. The method according to Note 1, wherein the changing from the serving cell to the cell indicated by the L2 signaling and / or L1 signaling comprises at least one of the following:

[0606] Starting a first timer for controlling a cell change procedure based on the L1 signaling and / or L2 signaling;

[0607] applying the indicated configuration of the cell;

[0608] Initiating a random access procedure to the indicated cell;

[0609] Considering that the indicated C-RNTI associated with the cell is its own C-RNTI;

[0610] receiving a DL transmission on the cell according to the indicated scheduling information; and

[0611] Information is sent to the indicated cell or a network node to which the cell belongs.

[0612] 14a. The method according to Note 14, wherein:

[0613] When the terminal device receives the first DL transmission on the indicated cell, the terminal device considers that the cell change is complete or has been successfully changed to the indicated cell.

[0614] 15. The method according to Note 14, wherein:

[0615] When the terminal device applies the configuration of the indicated cell, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

[0616] 16. The method according to note 14 or 15, wherein the configuration of the cell indicated by the application includes:

[0617] At least one of the SSB frequency, TA value, and physical layer configuration of the cell is applied.

[0618] 17. The method according to Note 14, wherein:

[0619] When the terminal device completes the random access procedure, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

[0620] 18. The method according to Note 14, wherein:

[0621] The information sent by the terminal device to the cell or the network node to which the cell belongs indicates that the cell change is complete or indicates a successful change to the indicated cell.

[0622] 19. The method according to note 14 or 18, wherein the sending of information to the indicated cell or the network node to which the cell belongs comprises at least one of the following:

[0623] Carrying the information via an RRC reconfiguration complete message;

[0624] Indicating the information through feedback of the L1 signaling and / or L2 signaling; and

[0625] The scheduling information indicated by the L1 signaling and / or L2 signaling indicates the information.

[0626] 20. The method according to any one of Notes 1, 14-19, wherein the method further comprises:

[0627] After the cell change is completed or the cell is successfully changed to the indicated cell, the terminal device starts communicating with the indicated cell and / or stops the first timer.

[0628] 21. The method according to Note 20, wherein:

[0629] The terminal device starts communicating with the indicated cell, including: sending and receiving channels and / or signals dedicated to the terminal device, and / or sending and receiving channels and / or signals not dedicated to the terminal device.

[0630] 22. The method according to Note 1 or 14, wherein the method further comprises:

[0631] When the change to the indicated cell fails, the terminal device initiates a connection reestablishment procedure.

[0632] 23. The method according to note 22, wherein the change to the indicated cell is considered to have failed when at least one of the following actions occurs:

[0633] The first timer times out;

[0634] The random access process initiated by the terminal device to the indicated cell fails or the number of failures reaches a preset number; and

[0635] The terminal device is unable to apply the indicated configuration or partial configuration of the cell.

[0636] 24. The method according to any one of Notes 1 to 23, further comprising:

[0637] Configuration information of a group of cells is received from the first network node.

[0638] 25. The method according to Note 1 or 24,

[0639] When the terminal device receives configuration information of a group of cells, the terminal device considers that the first network node supports a cell change procedure based on L1 signaling and / or L2 signaling.

[0640] 26. The method according to Note 1, 24, or 25, further comprising:

[0641] Broadcast information and / or an RRC dedicated message including first indication information is received from the first network node.

[0642] 27. The method according to Note 26, wherein the first indication information indicates at least one of the following:

[0643] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0644] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0645] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0646] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

[0647] 28. A method for cell change, the method being applied to a first network node, the method comprising:

[0648] receiving measurement results from the terminal device; and

[0649] L1 signaling and / or L2 signaling are sent to the terminal device to instruct the terminal device to change from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

[0650] 29. The method according to Note 28, wherein:

[0651] The measurement result is reported through at least one of RRC signaling, L1 signaling and MAC CE.

[0652] 30. The method according to Note 29, wherein:

[0653] Reporting the measurement result through RRC signaling includes: a measurement reporting process.

[0654] 31. The method according to Note 29, wherein:

[0655] The reporting of the measurement result through L1 signaling includes: reporting the measurement result of SSB and / or CSI-RS through L1 signaling.

[0656] 32. The method according to Note 29 or 31, wherein:

[0657] Reporting the measurement result through L1 signaling includes: periodic reporting of the measurement result and / or reporting based on event triggering.

[0658] 33. The method according to Note 29, wherein:

[0659] Reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

[0660] 34. The method according to Note 29, wherein:

[0661] Reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through one MAC CE.

[0662] 35. The method according to Note 29 or 34, wherein:

[0663] The MAC CE is different from the BFR MAC CE.

[0664] 36. The method according to Note 29, 34 or 35, wherein:

[0665] The MAC CE is periodically triggered and / or event triggered.

[0666] 37. The method according to Note 36, wherein:

[0667] The event includes: L1 indication and / or L3 indication.

[0668] 38. The method according to Note 28, wherein:

[0669] The L1 signaling is DCI, and / or the L2 signaling is MAC CE.

[0670] 39. The method according to note 28 or 38, wherein the L1 signaling indicates at least one of the following:

[0671] Cell information;

[0672] TCI state ID;

[0673] TA information;

[0674] The UE identifier allocated by the target cell to the terminal device;

[0675] HARQ feedback information of the L1 signaling; and

[0676] Scheduling information.

[0677] 40. The method according to note 28 or 38, wherein the L2 signaling indicates at least one of the following:

[0678] Cell information;

[0679] TCI state ID;

[0680] TA information;

[0681] The UE identifier allocated by the target cell to the terminal device;

[0682] HARQ feedback information of the L2 signaling; and

[0683] Scheduling information.

[0684] 41. The method according to Note 28, further comprising:

[0685] The first network node decides to use a cell change procedure based on L1 signaling and / or L2 signaling or a cell change procedure based on RRC signaling.

[0686] 42. The method according to Note 41, wherein:

[0687] The cell change process based on L1 signaling and / or L2 signaling includes: the first network node sending L1 signaling and / or L2 signaling to the terminal device to trigger the change of the serving cell; and / or,

[0688] The cell change process based on RRC signaling includes: the first network node sends an RRC reconfiguration message to the terminal device to trigger a change of the serving cell.

[0689] 43. The method according to Note 28, further comprising:

[0690] Send configuration information of a group of cells to the terminal device.

[0691] 44. The method according to Note 28 or 43, wherein the method further comprises:

[0692] Provide broadcast information and / or RRC dedicated message including first indication information to the terminal device.

[0693] 45. The method according to note 44, wherein the first indication information indicates at least one of the following:

[0694] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling;

[0695] The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling;

[0696] The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; and

[0697] The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

[0698] 46. ​​The method according to Note 44, wherein:

[0699] The RRC dedicated message explicitly or implicitly indicates support for a cell change procedure based on L1 signaling and / or L2 signaling.

[0700] 47. The method according to note 46, wherein the RRC dedicated message implicitly indicates support for a cell change procedure based on L1 signaling and / or L2 signaling, comprising:

[0701] When sending configuration information of a group of cells to the terminal device, the terminal device considers that the first network node supports a cell change procedure based on L1 signaling and / or L2 signaling.

Claims

1. A cell change apparatus, the apparatus being provided in a terminal device, the apparatus comprising: a first sending unit, configured to send the measurement result to the first network node; a first receiving unit configured to receive L1 signaling and / or L2 signaling from the first network node; as well as A first changing unit is configured to change from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

2. The device according to claim 1, wherein The first sending unit reports the measurement result through at least one of RRC signaling, L1 signaling and MAC CE.

3. The device according to claim 2, wherein Reporting the measurement result through L1 signaling includes: periodically reporting the measurement result and / or reporting the measurement result based on event triggering.

4. The device according to claim 2, wherein Reporting the measurement result through MAC CE includes: reporting available candidate beams through BFR MAC CE triggered by beam failure.

5. The device according to claim 2, wherein Reporting the measurement result through the MAC CE includes: reporting at least one of an indication of an available beam, a measurement result of the beam, whether there is an available beam, and the number of available beams through one MAC CE.

6. The device according to claim 1, wherein The L1 signaling and / or L2 signaling indicates at least one of the following: Cell information; TCI state ID; TA information; The UE identifier allocated by the target cell to the terminal device; HARQ feedback information of the L1 signaling and / or L2 signaling; as well as Scheduling information.

7. The device according to claim 1, wherein The first changing unit performs at least one of the following: Starting a first timer for controlling a cell change procedure based on the L1 signaling and / or L2 signaling; applying the indicated configuration of the cell; Initiating a random access procedure to the indicated cell; Considering that the indicated C-RNTI associated with the cell is its own C-RNTI; receiving a DL transmission on the cell according to the indicated scheduling information; and Information is sent to the indicated cell or a network node to which the cell belongs.

8. The device according to claim 7, wherein When the terminal device receives the first DL transmission on the indicated cell, the terminal device considers that the cell change is complete or has been successfully changed to the indicated cell.

9. The device according to claim 7, wherein When the terminal device applies the configuration of the indicated cell, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

10. The device according to claim 7, wherein When the terminal device completes the random access procedure, the terminal device considers that the cell change is completed or successfully changed to the indicated cell.

11. The device according to claim 7, wherein The information sent by the terminal device to the cell or the network node to which the cell belongs indicates that the cell change is complete or indicates a successful change to the indicated cell.

12. The device according to claim 7, wherein The sending information to the indicated cell or the network node to which the cell belongs includes at least one of the following: Carrying the information via an RRC reconfiguration complete message; Indicating the information through feedback of the L1 signaling and / or L2 signaling; and The scheduling information indicated by the L1 signaling and / or L2 signaling indicates the information.

13. The device according to claim 1, wherein After the cell change is completed or the cell is successfully changed to the indicated cell, the terminal device starts communicating with the indicated cell and / or stops the first timer.

14. The device according to claim 13, wherein The terminal device starts communicating with the indicated cell, including: sending and receiving channels and / or signals dedicated to the terminal device, and / or sending and receiving channels and / or signals not dedicated to the terminal device.

15. The device according to claim 1, When the terminal device receives configuration information of a group of cells, the terminal device considers that the first network node supports a cell change procedure based on L1 signaling and / or L2 signaling.

16. The device according to claim 1, wherein The device further comprises: A third receiving unit is configured to receive broadcast information and / or an RRC dedicated message including first indication information from the first network node.

17. A cell change apparatus, applied to a first network node, comprising: a fourth receiving unit configured to receive a measurement result from the terminal device; as well as A second sending unit sends L1 signaling and / or L2 signaling to the terminal device to instruct the terminal device to change from a serving cell to a cell indicated by the L2 signaling and / or L1 signaling.

18. The device according to claim 17, wherein The L1 signaling and / or L2 signaling indicates at least one of the following: Cell information; TCI state ID; TA information; The UE identifier allocated by the target cell to the terminal device; HARQ feedback information of the L1 signaling and / or L2 signaling; as well as Scheduling information.

19. The device according to claim 17, wherein The device further comprises: A first providing unit provides broadcast information and / or RRC dedicated message including first indication information to the terminal device.

20. The device according to claim 19, wherein The first indication information indicates at least one of the following: The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling; The first network node or the cell sending the first indication information does not support a cell change procedure based on L1 signaling and / or L2 signaling; The first network node or the cell sending the first indication information only supports a cell change procedure based on L3 signaling; as well as The first network node or the cell sending the first indication information supports a cell change procedure based on L1 signaling and / or L2 signaling and a cell change procedure based on L3 signaling.

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