Method and apparatus for triggering inter-cell mobility procedures

Abstract

An embodiment of the present invention provides a method and apparatus for triggering an inter-cell mobility procedure. The method includes: a first network device receiving measurement-related information, the measurement-related information including one of a Layer 1 measurement result obtained by a terminal device performing Layer 1 measurement on a frequency on which an inter-frequency candidate target cell is located or on the inter-frequency candidate target cell, an instruction from a second network device based on a Layer 3 measurement result obtained by the terminal device performing Layer 3 measurement on the frequency on which an inter-frequency candidate target cell is located or on the inter-frequency candidate target cell, or a Layer 1 measurement result related to the candidate target cell; and a step of the first network device triggering an inter-cell mobility procedure based on Layer 1 or Layer 2 from a serving cell to a target cell based on the measurement-related information. According to the embodiment of the present invention, it is possible to ensure that an inter-cell mobility mechanism based on L1 or L2 can support inter-frequency scenarios, thereby ensuring that a network provides service for a terminal using a cell with the best quality, thereby guaranteeing the service quality of the terminal and improving network throughput.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present invention relate to the field of communications technology. [Background technology]

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

[0003] Cell-level mobility needs to be triggered by explicit Radio Resource Control (RRC) signaling, ie handover needs to be triggered by RRC signaling.

[0004] The RRC triggered handover mechanism requires the UE (User Equipment) to reset at least the MAC (Media Access Control) entity, re-establish the RLC (Radio Link Control), and support RRC managed handover with or without PDCP (Packet Data Convergence Protocol) entity re-establishment.

[0005] For Data Radio Bearers (DRBs) using RLC Acknowledged Mode (AM), PDCP may be re-established with security key rekeying or an "unrekeyed" data recovery process may be initiated. For DRBs using Unacknowledged Mode (RLC UM), PDCP may be re-established with security key rekeying or may remain "unrekeyed." For Signaling Radio Bearers (SRBs), PDCP may remain "unrekeyed" and stored PDCP Packet Data Units (PDUs) / Service Data Units (SDUs) may be discarded or re-established with security key rekeying.

[0006] On the other hand, when a terminal moves from the coverage area of ​​one cell to the coverage area of ​​another cell, it is necessary to perform a serving cell change at some point. Currently, a serving cell change is triggered by Layer 3 (L3) measurements, performed by RRC signaling, and triggered synchronization reconfiguration for the PCell (Primary Cell) and PSCell (Primary Secondary Cell), and, if applicable, increased release of SCells (Secondary Cells). In both cases, a full L2 (and L1) reset is involved, resulting in longer delays, higher overhead, and longer disruption times than beam handover mobility. The goal of L1 / L2 mobility enhancements is to ensure serving cell changes via L1 / L2 signaling to reduce delays, overhead, and disruption times.

[0007] In order to reduce mobility delay, the mechanism and process of inter-cell mobility based on L1 / L2 includes the following:

[0008] Configuring and maintaining multiple candidate cells to allow rapid application of candidate cell configurations; Dynamic handover mechanism between candidate serving cells (including special cells and secondary cells) based on L1 / L2 signaling for applicable scenarios; L1 extensions to inter-cell beam management, including L1 measurements and reporting, and beam direction; Timing advance management, and CU-DU (Centralized Unit-Distributed Unit) interface signaling to support L1 / L2 mobility.

[0009] The above description of the background art is merely for the purpose of explaining the configuration of the present invention more clearly and completely, and is provided for the understanding of those skilled in the art. These configurations described in the background art of the present invention should not be construed as being well known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0010] According to the discovery of the present inventors, since the terminal cannot perform L1 measurements and reports for neighboring cells with a different frequency from the current serving cell, even if the quality of this neighboring cell is better than other neighboring cells with the same frequency, the network cannot switch the terminal to this neighboring cell with a different frequency, and the terminal will operate in a non-optimal cell, resulting in reduced network capacity.

[0011] In view of at least one of the above problems, embodiments of the present invention provide a method and apparatus for triggering an inter-cell mobility procedure, which can guarantee the service quality of a terminal and improve the throughput of a network. [Means for solving the problem]

[0012] In one aspect of an embodiment of the present invention, there is provided a triggering device for an inter-cell mobility procedure configured in a network device, the device including: a receiving unit that receives measurement-related information, wherein the measurement-related information includes one of a Layer 1 measurement result obtained by a terminal device performing Layer 1 measurement on a frequency on which a different-frequency candidate target cell is located or on a different-frequency candidate target cell, an instruction from a second network device based on a Layer 3 measurement result obtained by the terminal device performing Layer 3 measurement on a frequency on which a different-frequency candidate target cell is located or on a different-frequency candidate target cell, or a Layer 1 measurement result related to a candidate target cell; and a triggering unit that triggers an inter-cell mobility procedure based on Layer 1 or Layer 2 from a serving cell to a target cell based on the measurement-related information.

[0013] Another aspect of an embodiment of the present invention provides an inter-cell mobility procedure triggering device configured in a terminal device, the device including: a measurement unit that performs L1 measurements on a frequency on which an inter-frequency candidate target cell is located or on the inter-frequency candidate target cell; and a transmission unit that reports L1 measurement results to a network device, the L1 measurement results being used by the network device to trigger an inter-cell mobility procedure based on L1 or L2 from a serving cell of the terminal device to a target cell.

[0014] Another aspect of an embodiment of the present invention provides an inter-cell mobility procedure triggering device configured in a terminal device, the device including: a transmitter that reports Layer 3 measurement results of a different frequency candidate target cell to a second network device, the Layer 3 measurement results being used by the second network device to instruct a first network device to trigger an inter-cell mobility procedure based on Layer 1 or Layer 2 from a serving cell to a target cell, the second network device being an aggregation unit (CU) in a communication system.

[0015] Another aspect of an embodiment of the present invention provides an inter-cell mobility procedure triggering device configured in a terminal device, the device including: a transmitter for reporting Layer 1 measurement results to a network device, the Layer 1 measurement results relating to a different frequency candidate target cell, and the transmitter being used by the network device to trigger an inter-cell mobility procedure based on Layer 1 or Layer 2 from a serving cell to a target cell.

[0016] One of the advantageous effects of the embodiment of the present invention is as follows: According to the embodiment of the present invention, it is possible to ensure that the inter-cell mobility mechanism based on L1 or L2 can support different frequency scenarios, so that the network can use the cell with the best quality to provide service for the terminal, guarantee the service quality of the terminal, and improve the network throughput.

[0017] As shown in the following description and drawings, specific embodiments of the present invention are disclosed in detail to illustrate ways in which the principles of the present invention can be employed. However, the scope of the present invention is not limited to these embodiments. The present invention encompasses all modifications, alterations, and equivalents within the spirit and scope of the appended claims.

[0018] Features described and / or shown in one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in other embodiments, or may be substituted for features in other embodiments.

[0019] It should be noted that in this text, the term "comprise / have" means the presence of a feature, element, step or component, and does not exclude the presence or addition of one or more other features, elements, steps or components. [Brief explanation of the drawings]

[0020] Elements and features depicted in one drawing and one embodiment of an example of the invention may be combined with elements and features shown in one or more drawings or embodiments, and in the drawings, like reference numerals may indicate corresponding elements in multiple drawings and may indicate corresponding elements used in more than one embodiment. [Figure 1] FIG. 1 is a schematic diagram of an example of a mobility procedure between gNB-DUs within an intra-NR gNB-CU. [Figure 2] FIG. 1 is a schematic diagram of an example of a handover procedure between a gNB and a CU. [Figure 3] FIG. 1 is a schematic diagram of an example of a handover procedure within an AMF / UPF. [Figure 4] 1 is a schematic diagram of inter-cell mobility based on L1 / L2; [Figure 5] FIG. 1 is a schematic diagram of an example deployment scenario of NG-RAN according to an embodiment of the present invention. [Figure 6] FIG. 1 is a schematic diagram of an example deployment scenario of IAB according to an embodiment of the present invention. [Figure 7] 1 is a schematic diagram of an example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention; [Figure 8] FIG. 10 is a schematic diagram of another example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention; [Figure 9] FIG. 10 is a schematic diagram of another example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention; [Figure 10] FIG. 10 is a schematic diagram of another example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention; [Figure 11] 1 is a schematic diagram of an example of a triggering device for an inter-cell mobility procedure according to an embodiment of the present invention; [Figure 12] FIG. 10 is a schematic diagram of another example of a triggering device for an inter-cell mobility procedure according to an embodiment of the present invention. [Figure 13] FIG. 10 is a schematic diagram of another example of a triggering device for an inter-cell mobility procedure according to an embodiment of the present invention. [Figure 14] FIG. 10 is a schematic diagram of another example of a triggering device for an inter-cell mobility procedure according to an embodiment of the present invention. [Figure 15] 1 is a schematic diagram of a configuration of a network device according to an embodiment of the present invention; [Figure 16] FIG. 1 is a schematic diagram of a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The above and other features of the present invention will become apparent from the following description. In the specification and drawings, specific embodiments of the present invention are disclosed in detail, and some of the embodiments in which the principles of the present invention can be adopted are shown. However, the present invention is not limited to the described embodiments. The present invention includes all modifications, variations, and equivalents within the scope of the appended claims. Below, various embodiments of the present invention will be described with reference to the drawings. These embodiments are merely illustrative and do not limit the present invention.

[0022] In embodiments of the present invention, the terms "first," "second," etc. are used in titles to distinguish between different elements, but do not represent the spatial arrangement or temporal order of these elements, and these elements are not limited to these terms. The term "and / or" includes any and all combinations of one or more of the terms listed in the associated list. The terms "comprise," "include," "have," etc. refer to the presence of listed features, elements, elements, or components, but do not exclude the presence or addition of one or more other features, elements, elements, or components.

[0023] In the embodiments of the present invention, the singular forms "one," "the," etc., include the plural and should be understood broadly as "one kind" or "one class," and are not limited to "one." Furthermore, the term "said" should be understood to include both the singular and the plural, unless the context clearly indicates otherwise. Furthermore, the term "described in" should be understood to mean "described at least in part," and the term "based on" should be understood to mean "based at least in part," unless the context clearly indicates otherwise.

[0024] In embodiments of the present invention, the terms "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as, for example, Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0025] Additionally, communications between devices in a communications system may occur according to any stage of communications protocol, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and 5G, New Radio (NR), and / or other currently known or future developed communications protocols.

[0026] In an embodiment of the present invention, the term "network device" refers to a device in a communication system that allows a terminal device to access the communication system and provides a service to the terminal device, and may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobility management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0027] The base station may include, but is not limited to, a Node B (NodeB or NB), evolved Node B (eNodeB or eNB), 5G base station (gNB), etc., as well as a remote radio head (RRH), a remote radio unit (RRU), a relay or low power node (e.g., femto, pico, etc.), an integrated access and backhaul (IAB) node or IAB-DU or IAB-donor. The term "base station" may also include some or all of these functions, and each base station may provide communication coverage for a particular geographic area. The term "cell" may refer to a base station and / or its coverage area, depending on the context in which the term is used. The terms "cell" and "base station" may be interchangeable unless confusion arises.

[0028] In the embodiments of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to a device that accesses a communication network and receives network services via, for example, a network device. The terminal device may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), an IAB-MT, a station, etc.

[0029] The terminal device may include, but is not limited to, a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless phone, a smartphone, a smart watch, a digital camera, and the like.

[0030] Also, for example, in a scenario such as the Internet of Things (IoT), the user equipment may be a monitoring or measuring device or apparatus, and may include, but is not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0031] Furthermore, the term "network side" or "network device side" refers to the side of a network, which may be a base station or may include one or more of the network devices described above. The term "user side" or "terminal side" or "terminal device side" refers to the side of a user or terminal, which may be a UE or may include one or more of the terminal devices described above. In this specification, unless otherwise specified, "device" may refer to either a network device or a terminal device.

[0032] Currently, intra-gNB-DU mobility procedures are used when a UE moves from one cell to another within the same gNB-DU or when an intra-cell handover is performed. This procedure is supported by the UE Context Modification procedure, which may be initiated by the gNB-CU.

[0033] When an intra-gNB-DU handover (inter-cell or intra-cell) is performed, the gNB-CU provides a new UL GTP TEID (Uplink GPRS Tunneling Protocol Tunnel End Point identifier) ​​for the gNB-DU, and the gNB-DU provides a new DL GTP TEID (Downlink GTP TEID) for the gNB-CU. The gNB-DU continues to send UL PDCP PDUs to the gNB-CU using the previous UL GTP TEID until RLC is re-established, and then starts transmission using the new UL GTP TEID. The gNB-CU continues to send DL PDCP PDUs to the gNB-DU using the previous DL GTP TEID until PDCP re-establishment or PDCP data recovery is performed, and then starts transmission using the new DL GTP TEID.

[0034] Furthermore, the inter-gNB-DU mobility procedure is used when a terminal moves from one gNB-DU to another within the same gNB-CU. Figure 1 is a schematic diagram of an example of an intra-NR (within NR) inter-gNB-DU (between gNB-DUs) mobility procedure. As shown in Figure 1, this procedure includes the following steps:

[0035] 1. The UE sends a Measurement Report message to the source gNB-DU.

[0036] 2. The source gNB-DU sends a UL RRC MESSAGE TRANSFER message to the gNB-CU to transmit the received Measurement Report message.

[0037] 2a. The gNB-CU may send a UE CONTEXT MODIFICATION REQUEST message to the source gNB-DU to inquire about the latest configuration.

[0038] 2b. The source gNB-DU responds with a UE CONTEXT MODIFICATION RESPONSE message containing complete configuration information.

[0039] 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 Handover Preparation Information. In case of NG-RAN (NG Radio Access Network / 5G Radio Access Network) sharing, the gNB-CU includes the serving PLMN (Public Land Mobile Network) ID (for a Stand-alone Non-Public Network (SNPN), the serving SNPN ID is included).

[0040] 4. The target gNB-DU responds to the gNB-CU with a UE CONTEXT SETUP RESPONSE message.

[0041] 5. The gNB-CU sends a UE CONTEXT MODIFICATION REQUEST message containing the generated RRC Reconfiguration message to the source gNB-DU, instructing the UE to stop data transmission. The source gNB-DU sends a Downlink Data Delivery Status frame to notify the gNB-CU of the downlink data that failed to be transmitted to the UE.

[0042] 6. The source gNB-DU forwards the received RRCReconfiguration message to the UE.

[0043] 7. The source gNB-DU responds to the gNB-CU with a UE CONTEXT MODIFICATION RESPONSE message.

[0044] 8. The UE performs a random access procedure in the target gNB-DU. The target gNB-DU sends a downlink data transmission status frame to notify the gNB-CU. Downlink packets (which may include PDCP PDUs whose transmission failed in the source gNB-DU) are sent from the gNB-CU to the target gNB-DU.

[0045] Note: Whether the gNB-CU starts transmitting downlink user data to the gNB-DU before or after receiving the downlink data transmission status depends on the implementation of the gNB-CU.

[0046] 9. The UE responds to the target gNB-DU with an RRCReconfigurationComplete message.

[0047] 10. The target gNB-DU sends a UL RRC MESSAGE TRANSFER message to the gNB-CU to transmit the received RRCReconfigurationComplete message. Downlink packets are sent to the UE, and uplink packets are sent from the UE and forwarded to the gNB-CU via the target gNB-DU.

[0048] 11. The gNB-CU sends a UE CONTEXT RELEASE COMMAND message to the source gNB-DU.

[0049] 12. The source gNB-DU releases the UE context and responds to the gNB-CU with a UE CONTEXT RELEASE COMPLETE message.

[0050] The inter-gNB-CU mobility procedure is also used for handover between gNBs. Figure 2 is a schematic diagram of an example of a handover procedure between gNBs and CUs. As shown in Figure 2, this procedure includes the following steps:

[0051] 1. The source gNB initiates the handover and sends a HANDOVER REQUEST over the Xn interface.

[0052] 2. The target gNB performs admission control and provides the new RRC configuration as part of the HANDOVER REQUEST ACKNOWLEDGE.

[0053] 3. The source gNB provides the UE with RRC configuration by forwarding the RRC Reconfiguration message received in the HANDOVER REQUEST ACKNOWLEDGE. The RRC Reconfiguration message includes at least a cell ID and all information necessary to access the target cell so that the UE can access the target cell without reading system information. In some cases, the RRC Reconfiguration message includes information necessary for contention-based and non-contention-based random access. The information for accessing the target cell may include beam-specific information (if any).

[0054] 4. The UE moves the RRC connection to the target gNB and responds with RRCReconfigurationComplete.

[0055] 3 is a schematic diagram of an example of an intra-AMF (Access and Mobility Management Function) / UPF (User Plane Function) handover procedure. As shown in FIG. 3, the procedure includes the following steps:

[0056] 0. The UE context in the source gNB contains information about roaming and access restrictions, which is provided at the time of connection establishment or the last Timing Advance (TA) update.

[0057] 1. The source gNB configures the UE measurement procedure and UE reporting based on the measurement configuration.

[0058] 2. The source gNB decides on handover of the UE based on the Measurement Report and RRM (Radio Resource Management) information.

[0059] 3. The source gNB sends a Handover Request message to the target gNB, carrying a transparent RRC container containing information necessary for preparing the handover at the target side. This information includes at least the target cell ID, KgNB*, the UE's C-RNTI (Cell Radio Network Temporary Identifier) ​​at the source gNB, RRM configuration (including the UE's deactivation time), basic Access Stratum (AS) configuration (including antenna information and DL carrier frequency), the current Quality of Service (QoS) flow-to-DRB mapping rule applied to the UE, SIB1 from the source gNB, the UE's capabilities for different Radio Access Technologies (RATs), and measurement information reported by the UE, including PDU session-related information and, if available, beam-related information. The PDU session-related information includes slice information and QoS flow-level QoS configuration files (QoS profile(s)). The source gNB may further request a Dual Active Protocol Stack (DAPS) handover for one or more DRBs.

[0060] Note 1: After the handover request is sent, the source gNB should not reconfigure the UE, including performing mapping of reflected QoS flows to DRBs.

[0061] 4. Admission control may be performed by the target gNB. If slice information is sent to the target gNB, slice-aware admission control should be performed. If a PDU session is associated with an unsupported slice, the target gNB should reject such a PDU session.

[0062] 5. The target gNB prepares the handover with L1 / L2 and sends a HANDOVER REQUEST ACKNOWLEDGE to the source gNB, which contains a transparent container that is sent as an RRC message to the UE to perform the handover, and indicates whether or not the target gNB accepts the DAPS handover.

[0063] Note 2: Once the source gNB receives the HANDOVER REQUEST ACKNOWLEDGE or the transmission of the handover command is initiated in the downlink, data transfer may begin.

[0064] 6. The source gNB triggers the Uu handover by sending an RRCReconfiguration message to the UE. The message includes information necessary to access the target cell, i.e., at least the target cell ID, the new C-RNTI, and the target gNB security algorithm identifier for the selected security algorithm. It may also include a set of dedicated Random Access Channel (RACH) resources, an association of the RACH resources with synchronization signal blocks (SSBs), an association of the RACH resources with a UE-specific Channel State Information-Reference Signal (CSI-RS) configuration, and system information of the common RACH resources and the target cell.

[0065] 7. For DRBs where DAPS is not configured, the source gNB sends an SN STATUS TRANSFER message to the target gNB to convey the uplink PDCP SN (Sequence Number) receiver state and downlink PDCP SN transmitter state (i.e., RLC AM) of the DRB to which the PDCP state reservation applies. The uplink PDCP SN receiver state contains at least the PDCP SN of the first lost UL PDCP SDU and may also contain a bitmap of the reception state of out-of-sequence UL PDCP SDUs that the UE needs to retransmit at the target cell (if any). The downlink PDCP SN transmitter state indicates that the target gNB should assign the next PDCP SN for the new PDCP SDU and has not yet assigned it.

[0066] 8. The UE synchronizes to the target cell and completes the RRC handover process by sending an RRCReconfigurationComplete message to the target gNB. In the case of a DAPS handover, the UE does not leave the source cell even when it receives an RRCReconfiguration message. When the UE receives an explicit release from the target node, it releases the source resources and configuration and stops DL / UL reception / transmission with the source.

[0067] 8a / b. In case of DAP handover, the target gNB sends a HANDOVER SUCCESS message to the source gNB to inform it that the UE has successfully accessed the target cell. In response, the source gNB sends an SN STATUS TRANSFER message for DRBs with DAPS configured. The description in step 7 applies to these DRBs and refers to the prior art for normal data transfer.

[0068] Note 7: If DAPS is configured, the uplink PDCP SN receiver status and downlink PDCP SN transmitter status are transmitted for the DRB with RLC-UM in the SN STATUS TRANSFER message in step 8b.

[0069] 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 an NG-C interface (NG control plane interface) instance to the target gNB.

[0070] 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 based on the PDU session / tunnel, and can then release any U-plane / TNL (Transport Network Layer) resources to the source gNB.

[0071] 11. The AMF acknowledges the PATH SWITCH REQUEST message with a PATH SWITCH REQUEST ACKNOWLEDGE message.

[0072] 12. After receiving the PATH SWITCH REQUEST ACKNOWLEDGE message from the AMF, the target gNB sends a UE CONTEXT RELEASE to inform the source gNB that the switch has been successful. The source gNB can then release the radio and C-plane related resources associated with the UE context. Any ongoing data transfer can continue.

[0073] According to the discovery of the present inventors, for L1 / L2-based inter-cell mobility, it is assumed that L1 / L2 mobility is triggered by L1 measurements. Handover preparation measurements may be based on L3 measurements. Although L1 / L2-based inter-cell mobility procedures are applicable to both intra-frequency and inter-frequency scenarios, current L1 measurements do not support measurements of inter-frequency non-serving / neighboring cells, so inter-frequency L1 / L2 mobility may not be triggered by L1 measurements.

[0074] Figure 4 is a schematic diagram of inter-cell mobility based on L1 / L2. As shown in Figure 4, for three neighboring cells on carriers, one is on the same frequency as the current PCell and one is on the same frequency as the current SCell. The UE can perform L1 measurements on these two cells, but the other cell is on a different frequency from the current serving cell, so the UE cannot perform L1 measurements and reports on this cell. Therefore, even if the quality of this cell is better than the other two neighboring cells, the network cannot switch the UE to this cell. This causes the UE to operate in a non-optimal cell, resulting in reduced network capacity.

[0075] In order to solve at least one of the above problems, the present invention is proposed. The following describes examples of the present invention with reference to the drawings and specific embodiments.

[0076] In an embodiment of the present invention, scenarios supported by inter-cell mobility based on L1 / L2 include, but are not limited to, an Inter-DU scenario, an intra-DU scenario, a handover scenario, and a DC (Dual Connectivity) scenario (optional). Here, the handover scenario, i.e., PCell mobility / change, relates to a non-CA (carrier aggregation) scenario (i.e., PCell only) and a CA scenario (i.e., PCell and SCell(s)), and includes a scenario in which the target PCell / target SCell(s) is not the current serving cell, i.e., a CA->CA scenario with PCell change, a scenario in which the target PCell is one current SCell (optional), and a scenario in which the target SCell is the current PCell (optional). In addition, the DC scenario is, for example, a scenario in which a PSCell changes.

[0077] In the embodiment of the present invention, the source cell and the target cell may be synchronous or asynchronous, may be on the same frequency or different frequencies, and may operate in FR1 (frequency range 1) and FR2 (frequency range 2).

[0078] 5 is a schematic diagram of an example of a deployment scenario of an NG-RAN according to an embodiment of the present invention. As shown in FIG. 5, the NG-RAN includes a set of gNBs connected to a 5GC via an NG interface. The gNBs can be interconnected via an Xn interface. One gNB can include one gNB-CU and one or more gNB-DU(s), where one gNB-CU and one gNB-DU are connected via an F1 interface, and one gNB-DU can only be connected to one gNB-CU.

[0079] 6 is a schematic diagram of an example of a deployment scenario of an IAB according to an embodiment of the present invention. As shown in FIG. 6, an NG-RAN wirelessly connects to a gNB that can provide services to IAB-nodes via an IAB-node, which is referred to as an IAB-donor for supporting the IAB. The IAB-donor includes one IAB-donor-CU and one or more IAB-donor-DU(s).

[0080] In embodiments of the present invention, unless otherwise specified, all functions defined for the gNB-DU apply equally to the IAB-DU and IAB-donor-DU, all functions defined for the gNB-CU apply equally to the IAB-donor-CU, and all functions defined for the UE apply equally to the IAB-MT.

[0081] Example 1 The embodiment of the present invention provides a method for triggering an inter-cell mobility procedure, which is explained from the network device side.

[0082] 7 is a schematic diagram of an example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention. As shown in FIG. 7, the method includes the following steps:

[0083] Step 701: The first network device receives measurement-related information, which includes one of the following: an L1 measurement result obtained by the terminal device performing L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, an instruction from the second network device based on an L3 measurement result obtained by the terminal device performing L3 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, or an L1 measurement result related to the candidate target cell.

[0084] Step 702: The first network device triggers an L1 or L2-based inter-cell mobility procedure from a serving cell to a target cell based on the measurement-related information.

[0085] It should be noted that the above-mentioned FIG. 7 merely illustrates an example of the present invention, and the present invention is not limited thereto. For example, the execution order of various steps may be appropriately adjusted, some other steps may be added, or some steps may be removed. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above-mentioned FIG. 7.

[0086] In the above embodiment, the network device triggers an L1 or L2-based inter-cell mobility procedure from the serving cell to the target cell based on the L1 measurement result, L3 measurement or L3 measurement result obtained when the terminal device performs L1 measurement on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell, or the L1 measurement result of a cell related to the candidate target cell (i.e., the L1 measurement result related to the candidate target cell), thereby ensuring that the inter-cell mobility mechanism based on L1 or L2 can support inter-frequency scenarios, thereby ensuring that the network provides service for the terminal using the cell with the best quality, guaranteeing the service quality of the terminal, and improving network throughput.

[0087] In some embodiments, the first network device transmits first instruction information to the terminal device, and the first instruction information instructs the terminal device to perform L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell. The operation of the terminal device will be described in later embodiments.

[0088] In some embodiments, the first network device sends second instruction information to the terminal device, instructing the terminal device to perform L1 measurement using an autonomous interval, and the terminal device may perform L1 measurement on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell using the autonomous interval according to the instruction of the first network device.

[0089] For example, if the terminal device receives the second instruction information, it performs L1 measurement in the different frequency adjacent region using an autonomous interval. As another example, if the terminal device receives the second instruction information and the second instruction information allows the terminal device to perform L1 measurement in the different frequency adjacent region using an autonomous interval, the terminal device performs L1 measurement in the different frequency adjacent region using an autonomous interval. As another example, if the network device does not configure a measurement interval for the terminal device, the terminal device performs L1 measurement in the different frequency adjacent region using an autonomous interval based on the second instruction information.

[0090] In the above embodiment, the autonomous interval refers to a time when the terminal device is not scheduled by the network. That is, the terminal device may perform L1 measurement on the frequency where the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell in a time (subframe and / or slot) when the terminal device is not scheduled by the network according to the instruction of the first network device. The present invention is not limited thereto, and the autonomous interval may be a time when no data transmission is being performed, a time available for performing inter-frequency measurement, etc.

[0091] In some embodiments, the first network device configures a measurement interval for the terminal device. The present invention is not limited to the configuration method. As a result, the terminal device may perform L1 measurements on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell using the measurement interval configured by the network device. The operation of the terminal device will be described in later embodiments.

[0092] For example, if the terminal device cannot perform L1 measurements in different frequency adjacent regions using autonomous intervals, the network device (mandatory or always) configures a measurement interval for the terminal device.

[0093] As another example, if the terminal device configures a measurement interval for the terminal device, the terminal device may perform L1 measurement for the different frequency adjacent region using the measurement interval. As another example, if the terminal device cannot use an autonomous interval and the network device configures a measurement interval for the terminal device, the terminal device may perform L1 measurement for the different frequency adjacent region using the measurement interval.

[0094] In the above example, the inability of the terminal device to utilize autonomous intervals includes, for example, that the terminal device does not have the capability or that the network device does not support it, for example, that the network device has not configured the second instruction information or that the configured second instruction information does not allow the use of autonomous intervals.

[0095] In the above embodiment, the measurement interval refers to a time (subframe and / or slot) for inter-frequency measurement configured for the terminal device by the network device, for example, a period T and a time length x configured by the first network device, and an optional offset. The terminal device performs inter-frequency measurement for a time length x after the offset every period T (i.e., performs L1 measurement on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell).

[0096] In each of the above embodiments, during the autonomous interval or measurement interval, the terminal device does not transmit or receive UL data, DL data, signaling, reference signals, and / or channels to or from the network device.

[0097] In some embodiments, the first network device further receives third indication information sent by the second network device. The third indication information indicates whether to trigger an L1 or L2-based inter-cell mobility procedure from the serving cell to the target cell. Here, the first network device is a distributed unit in the communication system, such as a gNB-DU in an NG-RAN deployment scenario, or an IAB-donor-DU or IAB-node-DU in an IAB deployment scenario. The second network device is an aggregation unit in the communication system, such as a gNB-CU in an NG-RAN deployment scenario, or an IAB-donor-CU in an IAB deployment scenario.

[0098] In the above embodiment, the terminal device may transmit an L3 measurement report including measurement results of a cell and / or beam of one inter-frequency candidate target cell to the CU, and the CU may transmit an instruction to the DU indicating whether to perform mobility (cell change) based on L1 or L2 from the serving cell to the target cell, so that the DU can determine whether to trigger an inter-cell mobility procedure based on L1 or L2 from the serving cell to the target cell based on the instruction from the CU.

[0099] In some embodiments, the first network device configures a candidate target cell or a candidate target cell group for the terminal device based on L3 measurement results from the terminal device, where the candidate target cell or the candidate target cell in the candidate target cell group may be on the same frequency as the serving cell or on an inter-frequency basis.

[0100] In the above embodiments, the term "different frequency" refers to a frequency different from the frequency of the serving cell, including a different center frequency point or a different subcarrier spacing, but the present invention is not limited thereto.

[0101] In each of the above embodiments, the L1 measurement result may be an L1 measurement result of a beam and / or a reference signal of an inter-frequency candidate target cell or a cell associated with the inter-frequency candidate target cell. Here, the reference signal may be SSB and / or CSI-RS, and the present invention is not limited thereto. In addition, the cell associated with the inter-frequency candidate target cell may be an in-frequency candidate target cell or a serving cell, that is, the above L1 measurement result may be an L1 measurement result of an in-frequency candidate target cell or a serving cell associated with the inter-frequency candidate target cell.

[0102] In an embodiment of the present invention, triggering an inter-cell mobility procedure based on L1 or L2 from a serving cell to a target cell may include sending an L1 indication to a terminal device via the serving cell and / or sending an L2 indication to a terminal device via the serving cell.

[0103] In the above embodiment, the L1 instruction includes at least one of information of a target cell and information of a target cell group. Similarly, the L2 instruction includes at least one of information of a target cell and information of a target cell group. Based on the L1 instruction and / or the L2 instruction, the terminal device completes movement or handover from the serving cell to the target cell.

[0104] The above embodiments merely exemplify the methods of the embodiments of the present invention from the network side, and the present invention is not limited thereto. Appropriate modifications may be made based on the above embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0105] According to the method of the embodiment of the present invention, it is possible to ensure that the inter-cell mobility mechanism based on L1 or L2 can support different frequency scenarios, thereby ensuring that the network uses the cell with the best quality to provide services for the terminal, guaranteeing the service quality of the terminal, and improving the network throughput.

[0106] <Example 2> The embodiment of the present invention provides a method for triggering an inter-cell mobility procedure, and will be described from the terminal device side. Here, the description of the same content as in the first embodiment will be omitted.

[0107] 8 is a schematic diagram of another example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention. As shown in FIG. 8, the method includes the following steps:

[0108] Step 801: The terminal device performs L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell.

[0109] Step 802: The terminal device reports an L1 measurement result to a network device, which uses the L1 measurement result to trigger an L1 or L2-based inter-cell mobility procedure from the serving cell of the terminal device to a target cell.

[0110] It should be noted that the above-mentioned FIG. 8 merely illustrates an example of the present invention, and the present invention is not limited thereto. For example, the execution order of various steps may be appropriately adjusted, some other steps may be added, or some steps may be removed. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above-mentioned FIG. 8.

[0111] In the above embodiment, the terminal device performs L1 measurement on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell, and reports the measurement result to the network device, so that the network device triggers an L1 or L2-based inter-cell mobility procedure from the serving cell to the target cell based on the measurement result, thereby ensuring that the L1 or L2-based inter-cell mobility mechanism can support inter-frequency scenarios, and thus ensuring that the network uses the cell with the best quality to provide service for the terminal, thereby guaranteeing the service quality of the terminal and improving network throughput.

[0112] In the embodiments of the present invention, a different frequency refers to a frequency different from the frequency of the current serving cell, where the different frequency may be a different center frequency point, a different subcarrier spacing, or both a different center frequency point and a different subcarrier spacing.

[0113] In the above embodiment, the serving cell may be a special cell (SPCell (including PCell, PSCell, etc.)) or a secondary cell (SCell). The special cell and the secondary cell may be in the same cell group, or may be in the same or different cell groups.

[0114] In some embodiments, the terminal device performing the L1 measurements may be the terminal device performing the L1 measurements using an autonomous interval as instructed by the network device.

[0115] For example, if a terminal device receives instruction information (referred to as second instruction information) sent by a network device, and the second instruction information instructs the terminal device to perform L1 measurement based on an autonomous interval, the terminal device may perform L1 measurement using the autonomous interval in accordance with the instructions of the second instruction information.

[0116] Here, the autonomous interval refers to a time (subframe and / or slot) that is not scheduled by the network. Performing L1 measurement using the autonomous interval means performing L1 measurement at a time that is not scheduled by the network. The present invention is not limited thereto, and the autonomous interval may be a time when no data is transmitted, a time for performing inter-frequency measurement, etc.

[0117] In some other embodiments, the terminal device performing the L1 measurement may be the terminal device performing the L1 measurement using a measurement interval configured by the network device.

[0118] For example, the network device configures a measurement interval for the end device, and the end device uses the measurement interval to perform L1 measurements.

[0119] Here, the measurement interval refers to a time (subframe and / or slot) for inter-frequency measurement configured for the terminal device by the network device, for example, a period T and a time length x configured by the network device, and an optional offset. The terminal device performs inter-frequency measurement for a time length x after the offset every period T (i.e., performs L1 measurement on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell).

[0120] In some embodiments, the terminal device reporting the L1 measurement result to the network device may be the terminal device reporting the L1 measurement result to the network device if a first condition is met, where the first condition includes, but is not limited to, at least one of: a candidate target cell being better than a serving cell by an offset; a beam of the candidate target cell being better than a beam of the serving cell by an offset; the serving cell being bad; and a beam of the serving cell being bad.

[0121] That is, if the candidate target cell (beam) is better (by an offset) than the serving cell (beam), or if the serving cell (beam) is worse, the terminal device starts reporting (periodically).

[0122] In the above embodiment, "good" and "bad" may be determined based on measurement results. For example, if the measurement result of the candidate target cell (beam) is better (by an offset) than the measurement result of the serving cell (beam), the terminal device performs a report. Also, for example, if the measurement result of the serving cell (beam) is lower than a predetermined threshold, the terminal device performs a report. The same applies to other cases.

[0123] In the above embodiment, if the terminal device receives a handover command, or if the first condition is not met, or if the number of times the terminal device reports L1 measurement results reaches a predetermined maximum value, the terminal device stops reporting.

[0124] The handover command may be, for example, L1 signaling, L2 signaling, RRC signaling, etc., but the present invention is not limited thereto.

[0125] In some embodiments, the terminal device reporting L1 measurement results to the network device may be the terminal device reporting L1 measurement results of candidate target cells that meet the conditions, i.e., the terminal device reporting for each candidate target cell, or the terminal device reporting L1 measurement results of candidate target cells that meet the conditions and candidate target cells in the cell group in which the candidate target cells are located, i.e., the terminal device reporting for each candidate target cell group.

[0126] In the above embodiment, the L1 measurement result of the candidate target cell may be the L1 measurement result of the beam and / or reference signal of the candidate target cell, where the reference signal may be SSB and / or CSI-RS, but the present invention is not limited thereto.

[0127] In some embodiments, the terminal device may perform L1 measurements at the direction of the network device.

[0128] For example, the terminal device receives first instruction information sent by the network device, and the terminal device performs L1 measurement on the frequency on which the different frequency candidate target cell is located or on the different frequency candidate target cell based on the first instruction information.

[0129] In some embodiments, the terminal device may decide whether to perform L1 measurements based on the measurement results of the serving cell.

[0130] For example, the terminal device compares the measurement result of the serving cell with a preconfigured threshold (referred to as the first threshold), and if the measurement result of the serving cell is worse than the first threshold, performs L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell.

[0131] Also, for example, the terminal device compares the measurement result of the serving cell with a preconfigured threshold (referred to as the second threshold), and if the measurement result of the serving cell is better than the second threshold, stops or does not perform L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell.

[0132] In the above example, the measurement result of the serving cell may be a measurement result of a beam and / or a reference signal of the serving cell, where the reference signal may be an SSB and / or a CSI-RS, but the present invention is not limited thereto.

[0133] The above-mentioned embodiments merely exemplify the methods of the embodiments of the present invention from the terminal device side, and the present invention is not limited thereto. Appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0134] According to the method of the embodiment of the present invention, the terminal device performs measurements on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell, and reports the measurement results to the network device, so that the network performs an L1 or L2-based inter-frequency cell change based on the reported measurement results, thereby ensuring that the inter-cell mobility mechanism based on L1 or L2 can support inter-frequency scenarios, and thus ensuring that the network uses the cell with the best quality to provide service for the terminal, thereby guaranteeing the service quality of the terminal and improving network throughput.

[0135] Example 3 The embodiment of the present invention provides a method for triggering an inter-cell mobility procedure, and will be described from the terminal device side. Here, the description of the same content as in the first embodiment will be omitted.

[0136] 9 is a schematic diagram of another example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention. As shown in FIG. 9, the method includes the following steps:

[0137] Step 901: The terminal device reports L1 measurement results to a network device, which are related to inter-frequency candidate target cells and are used by the network device to trigger an inter-cell mobility procedure based on L1 or L2 from a serving cell to a target cell.

[0138] It should be noted that the above-mentioned Figure 9 merely illustrates an example of the present invention, and the present invention is not limited thereto. For example, the execution order of various steps may be appropriately adjusted, some other steps may be added, or some steps may be removed. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above-mentioned Figure 9.

[0139] In the above embodiment, the terminal device reports L1 measurement results related to the inter-frequency candidate target cells to the network side, and the network device triggers an L1 or L2-based inter-cell mobility procedure from the serving target cell to the target cell based on the L1 measurement results related to the inter-frequency candidate target cells, thereby ensuring that the inter-cell mobility mechanism based on L1 or L2 can support inter-frequency scenarios, thereby ensuring that the network uses the cell with the best quality to provide service for the terminal, ensuring the service quality of the terminal, and improving network throughput.

[0140] In the embodiment of the present invention, the L1 measurement result is the L1 measurement result of a cell related to an inter-frequency candidate target cell.

[0141] In some embodiments, when a network device configures a candidate target cell for a terminal device and the candidate target cell is a different frequency cell, a cell related to the different frequency candidate target cell may be a same-frequency cell related to the different frequency cell.

[0142] For example, when a network device configures a set of SpCellConfig IEs and a set of SCellConfig IEs for a terminal device, and the configuration of each candidate target cell is included in the above SpCellConfig IE or SCellConfig IE, if the candidate target cell is an inter-frequency cell, the inter-frequency candidate target cell is associated with an in-frequency candidate target cell. For example, the SpCellConfig IE or SCellConfig IE of the inter-frequency cell includes cell information (index or cell ID), and the cell is an in-frequency candidate target cell. The above is merely an exemplary description, and the cell associated with the inter-frequency candidate target cell may be a serving cell. In this case, the SpCellConfig IE or SCellConfig IE of the inter-frequency cell includes information of the serving cell (serving cell index or cell ID of the cell).

[0143] In some other embodiments, when a network device configures a candidate target cell group for a terminal device and the candidate target cell group includes a different frequency cell, a cell related to the different frequency candidate target cell is a same frequency cell in the candidate target cell group or a same frequency cell in a cell group other than the candidate target cell group.

[0144] For example, when a network device configures a set of CellGroupConfig IEs or a set of RRCReconfiguration messages including a CellGroupConfig IE for a terminal device, and the configuration of each candidate target cell is included in the above CellGroupConfig IE or the above RRCReconfiguration message, if the candidate target cell is an inter-frequency cell, the inter-frequency candidate target cell is associated with a same-frequency candidate target cell. For example, if the SpCellConfig IE or SCellConfig IE of the inter-frequency cell includes cell information (index or cell ID), and a same-frequency candidate target cell exists in the same cell group, the cell associated with the candidate target cell is a same-frequency candidate target cell in the same cell group; otherwise, the cell associated with the candidate target cell is a same-frequency candidate target cell in a different cell group. The above is merely an exemplary description, and the cell associated with the inter-frequency candidate target cell may be a serving cell, in which case the SpCellConfig IE or SCellConfig IE of the inter-frequency cell includes serving cell information (a serving cell index or a cell ID of this cell).

[0145] FIG. 10 is a schematic diagram of another example of a method for triggering an inter-cell mobility procedure according to an embodiment of the present invention.

[0146] Step 1001: The terminal device reports L3 measurement results of the inter-frequency candidate target cell to the second network device, which are used by the second network device to instruct the first network device to trigger an inter-cell mobility procedure based on L1 or L2 from the serving cell to the target cell.

[0147] In some embodiments, when an L1 measurement result related to a different frequency candidate target cell is reported, the terminal device transmits an L3 measurement result of the different frequency candidate target cell to a second network device, and the second network device instructs the first network device to trigger an L1 or L2 based mobility procedure from the serving cell to the target cell based on the L3 measurement result.

[0148] In some other embodiments, if the L1 measurement result related to the different frequency candidate target cell satisfies a second condition, the terminal device transmits the L3 measurement result of the different frequency candidate target cell to a second network device, and the second network device instructs the first network device to trigger an L1 or L2 based mobility procedure from the serving cell to the target cell based on the L3 measurement result.

[0149] In the above embodiment, the second condition includes, but is not limited to, at least one of: the L1 measurement result of a cell associated with the different frequency candidate target cell is better than that of the serving cell by an offset; the L1 measurement result of a beam of a cell associated with the different frequency candidate target cell is better than that of the serving cell by an offset; the L1 measurement result of the serving cell is poor; and the L1 measurement result of the beam of the serving cell is poor.

[0150] In the above embodiment, "good" and "bad" may be determined based on measurement results. For example, if the measurement result of the candidate target cell (its beam / reference signal) is better (by an offset) than the measurement result of the serving cell (its beam / reference signal), the terminal device performs a report. Also, for example, if the measurement result of the serving cell (its beam / reference signal) is lower than a predetermined threshold, the terminal device performs a report. The same applies to other cases.

[0151] In some other embodiments, if the L3 measurement results of the beam and / or reference signal of the different frequency candidate target cell satisfy the third condition, the terminal device transmits the L3 measurement results of the different frequency candidate target cell to a second network device, and the second network device instructs the first network device to trigger an L1 or L2 based mobility procedure from the serving cell to the target cell based on the L3 measurement results.

[0152] In the above embodiment, the third condition may be that the L3 measurement results of the beam and / or reference signal of the inter-frequency candidate target cell are better than those of the special cell and / or secondary cell by an offset. Here, the L3 measurement results of the beam and / or reference signal of the special cell or secondary cell may be the L3 measurement results of the best beam or reference signal of the special cell or secondary cell, but the present invention is not limited thereto. Alternatively, the third condition may be that the L3 measurement results of the beam and / or reference signal of the inter-frequency candidate target cell are better than, or preferably better than, a predetermined threshold (referred to as the third threshold), and the L3 measurement results of the beam and / or reference signal of the special cell are worse than a predetermined threshold (referred to as the fourth threshold). Here, the L3 measurement results of the beam and / or reference signal of the special cell may be the L3 measurement results of the best beam or reference signal of the special cell, but the present invention is not limited thereto.

[0153] In the above embodiment, the trigger conditions for reporting L3 measurement results are "L1 measurement results related to a different frequency candidate target cell are reported," "L1 measurement results related to a different frequency candidate target cell satisfy the second condition," and "L3 measurement results based on the beam or reference signal of the different frequency candidate target cell satisfy the third condition." However, the present invention is not limited to this, and other trigger conditions (trigger(s)) may be set for reporting L3 measurement results as long as they can trigger measurement reporting more quickly than existing measurement reporting trigger conditions and reduce measurement reporting delays.

[0154] In the above embodiment, if the terminal device receives a handover command, or if the second condition is not met, or if the third condition is not met, or if the number of times the terminal device reports L3 measurement results reaches a predetermined maximum value, the terminal device stops reporting.

[0155] The handover command may be, for example, L1 signaling, L2 signaling, RRC signaling, etc., but the present invention is not limited thereto.

[0156] In the above embodiments, the first network device is a distributed unit in the communication system, such as a gNB-DU in an NG-RAN deployment scenario, or an IAB-donor-DU or IAB-node-DU in an IAB deployment scenario, and the second network device is an aggregation unit in the communication system, such as a gNB-CU in an NG-RAN deployment scenario, or an IAB-donor-CU in an IAB deployment scenario.

[0157] For example, if an L1 measurement result related to a candidate target cell is reported, and / or the L1 measurement result related to the candidate target cell satisfies a specific condition (second condition), and / or the L3 measurement result of the candidate target cell satisfies a specific condition (third condition), the terminal device transmits a measurement report (L3 measurement report) including the (cell and / or beam) measurement result of the candidate target cell to the second network device, and the second network device then transmits an instruction to the first network device indicating whether to perform an L1 or L2-based transfer or cell change from the serving cell to the target cell.

[0158] The above-mentioned embodiments merely exemplify the methods of the embodiments of the present invention from the terminal device side, and the present invention is not limited thereto. Appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0159] According to the method of the embodiment of the present invention, the terminal device reports L1 measurement results related to the candidate target cell to a first network device, or the terminal device transmits L3 measurement results related to the candidate target cell to a second network device, so that the first network device can trigger an L1- or L2-based inter-cell mobility procedure from the serving cell to the target cell based on the L3 measurement and measurement report or the L1 measurement results related to the candidate target cell, thereby ensuring that the L1- or L2-based inter-cell mobility mechanism can support different frequency scenarios, thereby ensuring that the network uses the cell with the best quality to provide service for the terminal, guaranteeing the service quality of the terminal, and improving network throughput.

[0160] <Example 5> An embodiment of the present invention provides a triggering device for an inter-cell mobility procedure. The device may be a network device, or may be some members or components configured in the network device. The device according to the embodiment of the present invention corresponds to the method according to the first embodiment, and the description of the same content as in the first embodiment will be omitted here.

[0161] 11 is a schematic diagram of an example of a triggering device 1100 for an inter-cell mobility procedure according to an embodiment of the present invention. As shown in FIG. 11, the triggering device 1100 for an inter-cell mobility procedure according to an embodiment of the present invention includes the following components:

[0162] The receiving unit 1101 receives measurement-related information, which includes one of an L1 measurement result obtained by the terminal device performing an L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, an instruction from the second network device based on an L3 measurement result obtained by the terminal device performing an L3 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, or an L1 measurement result related to the candidate target cell.

[0163] The triggering unit 1102 triggers an L1 or L2 based inter-cell mobility procedure from the serving cell to the target cell based on the measurement related information.

[0164] In some embodiments, as shown in FIG. 11, the device 1100 further includes the following components:

[0165] The first transmitting unit 1103 transmits first instruction information to the terminal device. The first instruction information instructs the terminal device to perform L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell.

[0166] In some embodiments, as shown in FIG. 11, the device 1100 further includes the following components:

[0167] The second transmitting unit 1104 transmits second instruction information to the terminal device. The second instruction information instructs the terminal device to perform L1 measurement using an autonomous interval.

[0168] An autonomous interval is, for example, a time during which the terminal device is not scheduled by the network.

[0169] In some embodiments, as shown in FIG. 11, the device 1100 further includes the following components:

[0170] The first configuration unit 1105 configures a measurement interval for the terminal device, which is used by the terminal device to perform L1 measurements.

[0171] In some embodiments, the receiving unit 1101 receives third indication information sent by the second network device. The third indication information indicates whether to trigger an L1 or L2 based inter-cell mobility procedure from the serving cell to the target cell. In the above embodiments, the first network device is a distributed unit (DU) in the communication system, and the second network device is a centralized unit (CU) in the communication system.

[0172] In some embodiments, as shown in FIG. 11, the device 1100 further includes the following components:

[0173] The second configuration unit 1106 configures a candidate target cell or a candidate target cell group for the terminal device based on the L3 measurement result from the terminal device, where the candidate target cell or the candidate target cell in the candidate target cell group is on the same frequency or a different frequency as the serving cell.

[0174] In some embodiments, the trigger unit 1102 sends an L1 indication to the terminal device via the serving cell and / or sends an L2 indication to the terminal device via the serving cell to trigger an inter-cell mobility procedure based on L1 or L2 from the serving cell to the target cell.

[0175] In the above embodiment, the L1 indication includes at least one of information of the target cell and / or information of the target cell group.

[0176] In the above embodiment, the L2 indication includes at least one of information of the target cell and / or information of the target cell group.

[0177] In the above embodiment, different frequency means a frequency different from the frequency of the serving cell, and different frequency includes different center frequency points or different subcarrier intervals.

[0178] In the above embodiment, the L1 measurement results may be L1 measurement results of beams and / or reference signals of the candidate target cell or a cell associated with the candidate target cell, where the reference signals may be SSB and / or CSI-RS.

[0179] The embodiment of the present invention further provides a triggering device for an inter-cell mobility procedure. The device may be a terminal device or some members or components configured in the terminal device. The device according to the embodiment of the present invention corresponds to the method according to the second embodiment, and the description of the same content as in the second embodiment will be omitted here.

[0180] 12 is a schematic diagram of another example of a triggering device 1200 for an inter-cell mobility procedure according to an embodiment of the present invention. As shown in FIG. 12, the triggering device 1200 for an inter-cell mobility procedure according to an embodiment of the present invention includes the following components:

[0181] The measurement unit 1201 performs L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell.

[0182] The transmitter 1202 reports the L1 measurement result to the network device, which uses the L1 measurement result to trigger an L1 or L2-based inter-cell mobility procedure from the serving cell of the terminal device to the target cell.

[0183] In the above embodiment, different frequency means a frequency different from the frequency of the serving cell, and different frequency includes different center frequency points or different subcarrier intervals.

[0184] In some embodiments, the serving cell includes a special cell and a secondary cell, where the special cell and the secondary cell are in the same cell group or in the same or different cell groups.

[0185] In some embodiments, as shown in FIG. 12, the device 1200 further includes the following components:

[0186] The first receiving unit 1203 receives second instruction information transmitted by the network device. The second instruction information instructs the terminal device to perform L1 measurement based on an autonomous interval. The measuring unit 1201 performs L1 measurement using the autonomous interval.

[0187] In the above embodiment, the autonomous interval may be a time during which the terminal device is not scheduled by the network.

[0188] In some embodiments, the measurement unit 1201 performs L1 measurements using a measurement interval configured by the network device.

[0189] In some embodiments, the transmitter 1202 reports the L1 measurement result to the network device if a first condition is met, the first condition including at least one of: the candidate target cell is better than the serving cell by an offset; the beam of the candidate target cell is better than the beam of the serving cell by an offset; the serving cell is worse; and the beam of the serving cell is worse.

[0190] In some embodiments, the transmitter 1202 stops reporting L1 measurement results if the terminal device receives a handover command, if the first condition is not met, or if the number of times the terminal device reports L1 measurement results reaches a predetermined maximum value.

[0191] In some embodiments, the transmitter 1202 reports L1 measurement results of candidate target cells that meet the conditions, or the transmitter 1202 reports L1 measurement results of candidate target cells that meet the conditions and candidate target cells in the cell group in which the candidate target cells are located.

[0192] In some embodiments, the L1 measurements of the candidate target cell are L1 measurements of beams and / or reference signals of the candidate target cell, for example SSB and / or CSI-RS.

[0193] In some embodiments, as shown in FIG. 12, the device 1200 further includes the following components:

[0194] The second receiving unit 1204 receives the first instruction information transmitted by the network device.

[0195] The measurement unit 1201 performs L1 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell based on the first instruction information.

[0196] In some embodiments, the measurement unit 1201 compares the measurement result of the serving cell with a preconfigured first threshold, and if the measurement result of the serving cell is worse than the first threshold, the measurement unit 1201 performs L1 measurement on the frequency on which the inter-frequency candidate target cell is located or on the inter-frequency candidate target cell.

[0197] In some embodiments, the serving cell measurements may be measurements of the serving cell's beams and / or reference signals, such as SSB and / or CSI-RS.

[0198] The embodiment of the present invention further provides a triggering device for an inter-cell mobility procedure, which may be a terminal device or some members or components configured in the terminal device. The device according to the embodiment of the present invention corresponds to the method shown in Fig. 9 according to the third embodiment, and the description of the same content as in the second embodiment will be omitted here.

[0199] 13 is a schematic diagram of another example of a triggering device 1300 for an inter-cell mobility procedure according to an embodiment of the present invention. As shown in FIG. 13, the triggering device 1300 for an inter-cell mobility procedure according to an embodiment of the present invention includes the following components:

[0200] The transmitter 1301 reports the L1 measurement result to the network device, which is related to the inter-frequency candidate target cell and is used by the network device to trigger an L1 or L2 based inter-cell mobility procedure from the serving cell to the target cell.

[0201] In the above embodiment, the L1 measurement result is the L1 measurement result of a cell related to an inter-frequency candidate target cell.

[0202] In some embodiments, when the first network device configures a candidate target cell for the terminal device and the candidate target cell is a different frequency cell, a cell related to the different frequency candidate target cell is a same frequency cell related to the different frequency cell.

[0203] In some embodiments, when the first network device configures a candidate target cell group for the terminal device and the candidate target cell group includes a different frequency cell, a cell related to the different frequency candidate target cell is a same frequency cell in the candidate target cell group or a same frequency cell in a cell group other than the candidate target cell group.

[0204] The embodiment of the present invention further provides a triggering device for an inter-cell mobility procedure. The device may be a terminal device or some members or components configured in the terminal device. The device according to the embodiment of the present invention corresponds to the method shown in Fig. 10 according to the third embodiment, and the description of the same content as in the second embodiment will be omitted here.

[0205] 14 is a schematic diagram of another example of a triggering device 1400 for an inter-cell mobility procedure according to an embodiment of the present invention. As shown in FIG. 14, the triggering device 1400 for an inter-cell mobility procedure according to an embodiment of the present invention includes the following components:

[0206] The transmitter 1401 reports the L3 measurement result of the inter-frequency candidate target cell to the second network device. The L3 measurement result is used by the second network device to instruct the first network device to trigger an inter-cell mobility procedure based on L1 or L2 from the serving cell to the target cell. The second network device is an aggregation unit (CU) in the communication system.

[0207] In some embodiments, when an L1 measurement result related to the inter-frequency candidate target cell is reported or satisfies the second condition, or when an L3 measurement result of a beam and / or a reference signal of the inter-frequency candidate target cell satisfies the third condition, the transmitter 1401 reports the L3 measurement result to the second network device. The L3 measurement result is used by the second network device to instruct the first network device to trigger an inter-cell mobility procedure based on L1 or L2 from the serving cell to the target cell. The first network device is a distributed unit (DU) in the communication system, and the second network device is a centralized unit (CU) in the communication system.

[0208] In the above embodiment, the second condition may include at least one of: the L1 measurement result of a cell associated with the different frequency candidate target cell is better than that of the serving cell by an offset; the L1 measurement result of a beam of a cell associated with the different frequency candidate target cell is better than that of the serving cell by an offset; the L1 measurement result of the serving cell is poor; and the L1 measurement result of the beam of the serving cell is poor.

[0209] In the above embodiment, the third condition may include at least one of the following: the L3 measurement results of the beam and / or reference signal of the different frequency candidate target cell are better than the special cell and / or secondary cell by an offset; and / or the L3 measurement results of the beam and / or reference signal of the different frequency candidate target cell are better than a third threshold and the L3 measurement results of the beam and / or reference signal of the special cell are worse than a fourth threshold.

[0210] In the above embodiment, in some aspects, the transmitting unit 1401 stops reporting L3 measurement results when the terminal device receives a handover command, or when the second condition is not met, or when the third condition is not met, or when the number of times the terminal device reports L3 measurement results reaches a predetermined maximum value.

[0211] The above is an illustrative description of the methods of the embodiments of the present invention, and the present invention is not limited thereto. Appropriate modifications may be made based on the above embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0212] Although the above description only describes components or modules related to the present invention, the present invention is not limited thereto. The inter-cell mobility procedure triggering devices 1100 to 1400 may further include other components or modules. For specific content of these components or modules, reference may be made to related art. Furthermore, the above various components or modules may be implemented by hardware devices such as a processor, memory, transmitter, and receiver, and the present invention is not limited thereto.

[0213] According to the device of the embodiment of the present invention, it is possible to ensure that the inter-cell mobility mechanism based on L1 or L2 can support different frequency scenarios, thereby ensuring that the network uses the cell with the best quality to provide services for the terminal, guaranteeing the service quality of the terminal, and improving the network throughput.

[0214] <Example 5> An embodiment of the present invention further provides a communication system including a network device and a terminal device.

[0215] In some embodiments, the network device includes the device 1100 described in Example 4 and is configured to execute the method described in Example 1. Since the method is described in detail in Example 1, the contents thereof are incorporated herein by reference, and description thereof will be omitted.

[0216] In some embodiments, the terminal device includes the device 1200, 1300, or 1400 described in Example 4, and is configured to execute the method described in Example 2 or 3. Since the method is described in detail in Example 2 or 3, the contents thereof are incorporated herein by reference, and description thereof will be omitted.

[0217] An embodiment of the present invention further provides a network device, which may be, for example, a base station, but the present invention is not limited thereto and may be other network devices.

[0218] 15 is a schematic diagram of a network device according to an embodiment of the present invention. As shown in FIG. 15, the network device 1500 may include a processor 1501 and a memory 1502, and the memory 1502 is connected to the processor 1501. The memory 1502 may store various data, and may further store an information processing program, execute the program under the control of the processor 1501, receive various information transmitted by a terminal device, and transmit various information to the terminal device.

[0219] In some embodiments, the functions of the device 1100 of Example 4 may be integrated into the processor 1501. Here, the processor 1501 may be configured to execute a program to realize the method described in Example 1, the contents of which are incorporated herein by reference, and the description thereof will be omitted here.

[0220] In some other embodiments, the device 1100 of the fourth embodiment may be configured separately from the processor 1501. For example, the device 1100 of the fourth embodiment may be configured as a chip connected to the processor 1501, and the functions of the device 1100 of the fourth embodiment are realized under the control of the processor 1501.

[0221] 15, the network device 1500 may further include a transceiver 1503 and an antenna 1504. The functions of the above components are similar to those of the prior art, and a description thereof will be omitted here. The network device 1500 does not need to include all the units shown in FIG. 15. The network device 1500 may further include units not shown in FIG. 15, and prior art may be referred to.

[0222] An embodiment of the present invention further provides a terminal device, which may be, for example, a UE, but the present invention is not limited thereto and may be other terminal devices.

[0223] 16 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in FIG. 16, the terminal device 1600 may include a processor 1601 and a memory 1602, where the memory 1602 stores data and programs and is connected to the processor 1601. It should be noted that this diagram is illustrative, and other types of structures may be used to supplement or replace this structure to realize communication functions or other functions.

[0224] In some embodiments, the functions of the device 1200, 1300, or 1400 in Example 4 may be integrated into the processor 1601. Here, the processor 1601 may be configured to execute a program to realize the method described in Example 2 or 3, the contents of which are incorporated herein by reference, and the description thereof will be omitted here.

[0225] In some other embodiments, the device 1200, 1300, or 1400 of the fourth embodiment may be configured separately from the processor 1601. For example, the device 1200, 1300, or 1400 of the fourth embodiment may be configured as a chip connected to the processor 1601, and the functions of the device 1200, 1300, or 1400 of the fourth embodiment may be realized under the control of the processor 1601.

[0226] As shown in Fig. 16, the terminal device 1600 may further include a communication module 1603, an input unit 1604, a display 1605, a power supply 1606, and the like. Here, the functions of the above units are similar to those of the prior art, and therefore a description thereof will be omitted here. Note that the terminal device 1600 does not need to include all of the units shown in Fig. 16. Furthermore, the terminal device 1600 may further include units not shown in Fig. 16, and prior art may be referred to.

[0227] An embodiment of the present invention further provides a computer-readable program, which, when executed in a network device, causes the network device to perform the method described in embodiment 1.

[0228] An embodiment of the present invention further provides a storage medium having a computer-readable program stored thereon, the program causing a network device to perform the method described in embodiment 1 when the program is executed.

[0229] An embodiment of the present invention further provides a computer-readable program, which, when executed in a terminal device, causes the terminal device to perform the method described in embodiment 2 or 3.

[0230] An embodiment of the present invention further provides a storage medium having a computer-readable program stored therein, the program causing a terminal device to perform the method described in embodiment 2 or 3 when the program is executed.

[0231] The above-described apparatus and method of the present invention may be realized by hardware or a combination of hardware and software. The present invention relates to a computer-readable program that, when executed by a logic unit, causes the logic unit to implement the above-described apparatus or components, or to implement the above-described various methods or steps. The present invention also relates to a storage medium for storing the above-described program, such as a hard disk, magnetic disk, optical disk, DVD, flash memory, etc.

[0232] Each processing method in each device described with reference to the embodiments of the present invention may be implemented by hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in the drawings, or one or more combinations of the functional block diagrams, may correspond to each software module in a computer program flow or each hardware module. These software modules may correspond to each step shown in the drawings. These hardware modules may be implemented by implementing these software modules in hardware, for example, using a field programmable gate array (FPGA).

[0233] The software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, mobile hard disk, CD-ROM, or any other form of storage medium known to those skilled in the art. The storage medium may be connected to the processor so that the processor reads information from or writes information to the storage medium, or the storage medium may be a component 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 inserted into the mobile terminal. For example, if a device (e.g., a mobile terminal) uses a relatively 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.

[0234] One or more functional blocks and / or one or more combinations of functional blocks in the functional block diagrams set forth in the figures may be implemented with 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 to perform the functions described herein. One or more functional blocks and / or one or more combinations of functional blocks in the functional block diagrams set forth in the figures may be implemented with, for example, a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors in combination with a DSP communication, or any other configuration.

[0235] Although the present invention has been described above with reference to specific embodiments, the above description is merely illustrative and does not limit the scope of protection of the present invention. Various modifications and changes may be made to the present invention without departing from the spirit and principles of the present invention, and these modifications and changes are also within the scope of the present invention.

[0236] Furthermore, the following supplementary notes are disclosed regarding the embodiments including the above examples. (Appendix 1) A method for triggering an inter-cell mobility procedure, comprising: a step of receiving measurement-related information by a first network device, the measurement-related information including one of an L1 measurement result obtained by a terminal device performing an L1 measurement on a frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, an instruction from a second network device based on an L3 measurement result obtained by a terminal device performing an L3 measurement on a frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, or an L1 measurement result related to the candidate target cell; and the first network device triggering an L1 or L2 based inter-cell mobility procedure from a serving cell to a target cell based on the measurement-related information. (Appendix 2) The method described in Supplementary Note 1 further includes a step in which the first network device sends first instruction information to the terminal device, the first instruction information instructing the terminal device to perform L1 measurements on the frequency on which the different frequency candidate target cell is located or on the different frequency candidate target cell. (Appendix 3) 3. The method of claim 1, further comprising the step of: the first network device sending second instruction information to the terminal device, the second instruction information instructing the terminal device to perform L1 measurements using autonomous intervals. (Appendix 4) 4. The method of claim 3, wherein the autonomous interval refers to a time period during which the terminal device is not scheduled by the network. (Appendix 5) 3. The method of claim 1, further comprising the step of: the first network device configuring a measurement interval for the terminal device, the measurement interval being used by the terminal device to perform the L1 measurements. (Appendix 6) The method further includes receiving, by the first network device, third indication information sent by the second network device, the third indication information indicating whether to trigger an L1 or L2 based inter-cell mobility procedure from a serving cell to a target cell; 2. The method of claim 1, wherein the second network device is an aggregation unit (CU) in a communication system. (Appendix 6a) 7. The method of any one of claims 1 to 6, wherein the first network device is a distributed unit (DU) in a communication system. (Appendix 7) The first network device further comprises configuring a candidate target cell or a candidate target cell group for the terminal device based on an L3 measurement result from the terminal device; The method according to any of the preceding supplementary notes, wherein the candidate target cell or the candidate target cell in the candidate target cell group is on the same frequency or a different frequency as the serving cell. (Appendix 8) triggering an L1 or L2 based inter-cell mobility procedure from the serving cell to a target cell, sending an L1 indication to the terminal device via the serving cell; and / or 2. The method of claim 1, comprising sending an L2 indication to the terminal device via the serving cell. (Appendix 9) The L1 instruction is Target cell information, and 9. The method of claim 8, including at least one of target cell group information. (Appendix 10) The L2 instruction is Target cell information, and 9. The method of claim 8, including at least one of target cell group information. (Appendix 11) The different frequency means a frequency different from the frequency of the serving cell, 2. The method of claim 1, wherein the different frequencies include different center frequency points or different subcarrier spacings. (Appendix 12) The method described in Appendix 1, wherein the L1 measurement results are L1 measurement results of beams and / or reference signals of a candidate target cell or a cell related to the candidate target cell. (Appendix 13) 13. The method of claim 12, wherein the reference signal is SSB and / or CSI-RS. (Appendix 14) A method for triggering an inter-cell mobility procedure, comprising: A step in which a terminal device performs L1 measurement on a frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell; A method comprising: a step in which the terminal device reports L1 measurement results to a network device, the L1 measurement results being used by the network device to trigger an inter-cell mobility procedure based on L1 or L2 from the terminal device's serving cell to a target cell. (Appendix 15) The method of claim 14, wherein the serving cell includes a special cell and a secondary cell, and the special cell and the secondary cell are in the same cell group or in the same or different cell groups. (Appendix 16) The different frequency means a frequency different from the frequency of the serving cell, 15. The method of claim 14, wherein the different frequencies include different center frequency points or different subcarrier spacings. (Appendix 17) The step of the terminal device performing the L1 measurement includes: receiving, by the terminal device, second instruction information sent by a network device, the second instruction information instructing the terminal device to perform L1 measurements based on autonomous intervals; and wherein the terminal device performs the L1 measurements using an autonomous interval. (Appendix 18) 18. The method of claim 17, wherein the autonomous interval refers to a time period during which the terminal device is not scheduled by the network. (Appendix 19) The step of the terminal device performing the L1 measurement includes: 15. The method of claim 14, comprising a step in which the terminal device performs the L1 measurements using a measurement interval configured by a network device. (Appendix 20) The step of the terminal device reporting the L1 measurement result to the network device includes: If a first condition is satisfied, the terminal device reports the L1 measurement result to a network device; The first condition is: the candidate target cell is better than the serving cell by an offset; the beam of the candidate target cell is better than the beam of the serving cell by an offset; the serving cell is bad; and 15. The method of claim 14, including at least one of the following: the serving cell has a poor beam. (Appendix 21) The method of claim 20, further comprising a step of the terminal device stopping reporting the L1 measurement results if the terminal device receives a handover command, if the first condition is not satisfied, or if the number of times the terminal device reports the L1 measurement results reaches a predetermined maximum value. (Appendix 22) The step of the terminal device reporting the L1 measurement result to the network device includes: The terminal device reports L1 measurement results of candidate target cells that satisfy the conditions; or A method as described in Supplementary Note 14, including a step in which the terminal device reports L1 measurement results of candidate target cells that satisfy conditions and candidate target cells in a cell group in which the candidate target cells are located. (Appendix 23) 23. The method of claim 22, wherein the L1 measurement results of the candidate target cell are L1 measurement results of a beam and / or reference signal of the candidate target cell. (Appendix 24) 24. The method of claim 23, wherein the reference signal is SSB and / or CSI-RS. (Appendix 25) receiving, by the terminal device, first indication information sent by a network device; The method described in Supplementary Note 14, further comprising a step in which the terminal device performs L1 measurements on the frequency on which the different frequency candidate target cell is located or on the different frequency candidate target cell based on the first indication information. (Appendix 26) The terminal device comparing the measurement result of the serving cell with a preconfigured first threshold; The method of claim 14, further comprising the step of performing L1 measurements on the frequency on which the different frequency candidate target cell is located or on the different frequency candidate target cell if the measurement result of the serving cell is worse than the first threshold. (Appendix 27) The method described in Supplementary Note 26, wherein the measurement results of the serving cell are measurement results of the beam and / or reference signal of the serving cell. (Appendix 28) 28. The method of claim 27, wherein the reference signal is SSB and / or CSI-RS. (Appendix 29) A method for triggering an inter-cell mobility procedure, comprising: A method comprising: a step in which a terminal device reports L3 measurement results of a different frequency candidate target cell to a second network device, the L3 measurement results being used by the second network device to instruct a first network device to trigger an inter-cell mobility procedure based on L1 or L2 from a serving cell to a target cell, the second network device being an aggregation unit (CU) in a communication system. (Appendix 30) The method described in Supplementary Note 29, wherein when an L1 measurement result related to the different frequency candidate target cell is reported or satisfies a second condition, or when an L3 measurement result of a beam and / or reference signal of the different frequency candidate target cell satisfies a third condition, the terminal device reports the L3 measurement result to the second network device. (Appendix 31) 31. The method of claim 29 or 30, wherein the first network device is a distributed unit (DU) in a communication system. (Appendix 32) The second condition is: The L1 measurement result of a cell related to the inter-frequency candidate target cell is better than that of a serving cell by an offset; The L1 measurement result of the beam of the cell related to the inter-frequency candidate target cell is better than the beam of the serving cell only in offset; Poor L1 measurement results from the serving cell, and 31. The method of claim 30, including at least one of: poor L1 measurement results for the beam of the serving cell. (Appendix 33) The third condition is: The L3 measurement result of the beam and / or reference signal of the different frequency candidate target cell is better than that of the special cell and / or secondary cell by an offset, and / or The method described in Supplementary Note 30 includes at least one of the L3 measurement results of the beam and / or reference signal of the different frequency candidate target cell being better than a third threshold and the L3 measurement results of the beam and / or reference signal of the special cell being worse than a fourth threshold. (Appendix 34) The method of claim 30, further comprising a step of the terminal device stopping reporting the L3 measurement results if the terminal device receives a handover command, if the second condition is not met, if the third condition is not met, or if the number of times the terminal device reports L3 measurement results reaches a predetermined maximum value. (Appendix 35) A method for triggering an inter-cell mobility procedure, comprising: A method comprising: a step in which a terminal device reports L1 measurement results to a network device, the L1 measurement results relating to a different frequency candidate target cell, and the network device uses the L1 or L2 based inter-cell mobility procedure from a serving cell to a target cell. (Appendix 36) The method described in Supplementary Note 35, wherein the L1 measurement result is an L1 measurement result of a cell related to the inter-frequency candidate target cell. (Appendix 37) When the first network device configures a candidate target cell for the terminal device and the candidate target cell is a different frequency cell, a cell related to the different frequency candidate target cell is a same-frequency cell related to the different frequency cell; 37. The method of claim 36, wherein, when the first network device configures a candidate target cell group for the terminal device and the candidate target cell group includes a different frequency cell, a cell related to the different frequency candidate target cell is a same-frequency cell in the candidate target cell group or a same-frequency cell in a cell group other than the candidate target cell group. (Appendix 38) 14. A network device comprising: a memory having a computer program stored therein; and a processor, the processor configured to execute the computer program to implement the method of any one of Supplementary Notes 1 to 13. (Appendix 39) A terminal device comprising: a memory having a computer program stored therein; and a processor, the processor configured to execute the computer program to implement a method according to any one of claims 14 to 37. (Appendix 40) 39. A communication system comprising: a network device according to claim 38; and a terminal device according to claim 39.

Claims

1. An apparatus for triggering an inter-cell mobility procedure, comprising: a receiving unit that receives measurement-related information, the measurement-related information including one of a Layer 1 measurement result obtained by a terminal device performing Layer 1 measurement on a frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, an instruction from a second network device based on a Layer 3 measurement result obtained by the terminal device performing Layer 3 measurement on the frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell, or a Layer 1 measurement result related to the candidate target cell; and a trigger unit for triggering a Layer 1 or Layer 2 based inter-cell mobility procedure from a serving cell to a target cell based on the measurement-related information.

2. 2. The device according to claim 1, further comprising: a first transmitter configured to transmit first instruction information to the terminal device, the first instruction information instructing the terminal device to perform Layer 1 measurements on a frequency on which the different-frequency candidate target cell is located or on the different-frequency candidate target cell.

3. 2. The apparatus of claim 1, further comprising: a second transmitter configured to transmit second instruction information to the terminal device, the second instruction information instructing the terminal device to perform Layer 1 measurements using autonomous intervals.

4. The device of claim 3 , wherein the autonomous interval refers to a time during which the terminal device is not scheduled by a network.

5. 2. The apparatus of claim 1, further comprising: a first configuration unit for configuring a measurement interval for the terminal device, the measurement interval being used by the terminal device to perform the Layer 1 measurements.

6. the receiving unit receives third indication information sent by the second network device, the third indication information indicating whether to trigger an inter-cell mobility procedure based on Layer 1 or Layer 2 from a serving cell to a target cell; The device of claim 1 , wherein the second network device is an aggregation unit in a communication system.

7. The device of claim 1 , wherein the first network device is a distributed unit in a communication system.

8. 2. The apparatus of claim 1, further comprising: a second component configured to configure a candidate target cell or a candidate target cell group for a terminal device based on Layer 3 measurement results from the terminal device, wherein the candidate target cell or the candidate target cell in the candidate target cell group is on the same frequency or a different frequency as the serving cell.

9. Triggering a Layer 1 or Layer 2 based inter-cell mobility procedure from the serving cell to a target cell comprises: sending a Layer 1 indication to the terminal device via the serving cell; and / or The apparatus of claim 1 , further comprising transmitting a Layer 2 indication to the terminal device via the serving cell.

10. The different frequency means a frequency different from the frequency of the serving cell, The apparatus of claim 1 , wherein different frequencies include different center frequency points or different subcarrier spacings.

11. The apparatus of claim 1 , wherein the layer 1 measurements are layer 1 measurements of beams and / or reference signals of a candidate target cell or a cell associated with the candidate target cell.

12. An apparatus for triggering an inter-cell mobility procedure, comprising: An apparatus including: a transmitter that reports Layer 3 measurement results of an inter-frequency candidate target cell to a second network device, the Layer 3 measurement results being used by the second network device to instruct a first network device to trigger an inter-cell mobility procedure based on Layer 1 or Layer 2 from a serving cell to a target cell, the second network device being an aggregation unit in a communication system.

13. 13. The device of claim 12, wherein when a Layer 1 measurement result related to the different-frequency candidate target cell is reported or satisfies a second condition, or when a Layer 3 measurement result of a beam and / or a reference signal of the different-frequency candidate target cell satisfies a third condition, the transmitter reports the Layer 3 measurement result to the second network device.

14. The device of claim 12 , wherein the first network device is a distributed unit in a communication system.

15. The second condition is: Layer 1 measurement results of cells associated with the inter-frequency candidate target cell are better than a serving cell by an offset; Layer 1 measurement results of a beam of a cell associated with the inter-frequency candidate target cell are better than a beam of a serving cell by only an offset; Poor Layer 1 measurements in the serving cell, and The apparatus of claim 13 , wherein the at least one of the following is present: poor Layer 1 measurement results for a beam of a serving cell.

16. The third condition is: The layer 3 measurement results of the beam and / or reference signal of the inter-frequency candidate target cell are better than the special cell and / or secondary cell by an offset, and / or The device of claim 13, comprising at least one of: Layer 3 measurement results of the beam and / or reference signal of the inter-frequency candidate target cell being better than a third threshold; and Layer 3 measurement results of the beam and / or reference signal of the special cell being worse than a fourth threshold.

17. The device described in claim 13, wherein the transmitter stops reporting the Layer 3 measurement results when the terminal device receives a handover command, when the second condition is not satisfied, when the third condition is not satisfied, or when the number of times the terminal device reports Layer 3 measurement results reaches a predetermined maximum value.

18. An apparatus for triggering an inter-cell mobility procedure, comprising: An apparatus comprising: a transmitter for reporting Layer 1 measurement results to a network device, the Layer 1 measurement results relating to an inter-frequency candidate target cell, and used by the network device to trigger an inter-cell mobility procedure based on Layer 1 or Layer 2 from a serving cell to a target cell.

19. The apparatus of claim 18 , wherein the Layer 1 measurement results are Layer 1 measurement results of a cell associated with the inter-frequency candidate target cell.

20. When the first network device configures a candidate target cell for the terminal device and the candidate target cell is a different frequency cell, a cell related to the different frequency candidate target cell is a same-frequency cell related to the different frequency cell; 20. The device of claim 19, wherein, when the first network device configures a candidate target cell group for the terminal device and the candidate target cell group includes a different-frequency cell, a cell related to the different-frequency candidate target cell is a same-frequency cell in the candidate target cell group or a same-frequency cell in a cell group other than the candidate target cell group.

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