Mobility management method and device, terminal equipment, network equipment and storage medium

Abstract

The invention relates to the technical field of wireless communication, and particularly provides a mobility management method and device, terminal equipment, network equipment and a storage medium. The mobility management method comprises the following steps: receiving a mobility management message, wherein the mobility management message at least comprises measurement configuration information and execution condition information of one or more cells; acquiring measurement information of one or more cells at least based on the measurement configuration information; and determining to access one or more target cells in the one or more cells based on the measurement information and the execution condition information. The terminal equipment triggers the cell switching based on the mobility management, so that the switching delay is reduced, and the robustness is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of mobile communication technologies, and in particular, to a mobility management method, apparatus, terminal device, network device, and storage medium. Background Art

[0002] In the field of mobile communication technologies, a terminal device using a network service may face problems such as interruption of the current network service or degradation of quality due to factors such as mobility requirements, adjustment of wireless transmission service load, activation of operation and maintenance, device failures, and cell load. In existing solutions, a cross-cell mobility mechanism based on layer 1 (L1) / layer 2 (L2) signaling is introduced, that is, handover is completed based on L1 / L2 signaling to reduce latency. For example, the terminal device performs L1 measurements on the configured reference signals according to the configuration of the network side, and then reports the indices of K reference signals of N cells and / or the L1-reference signal received power (L1-RSRP) according to the reporting configuration. That is to say, based on the measured signal conditions, the terminal device reports N×K measurement results.

[0003] Although the measurement reporting of L1 / L2 and the subsequent MAC CE commands have reduced latency, in the case of the FR2 "millimeter wave" frequency band, the channel state changes faster, and it is necessary to further reduce the handover delay and increase the robustness of the handover. Summary of the Invention

[0004] In view of the above problems, the present disclosure is proposed. The present disclosure provides a mobility management method, apparatus, terminal device, network device, and storage medium.

[0005] According to one aspect of the present disclosure, there is provided a mobility management method for a terminal device, including: receiving a mobility management message, the mobility management message including at least measurement configuration information of one or more cells and execution condition information; obtaining measurement information of one or more cells based at least on the measurement configuration information; and determining to access one or more target cells in one or more of the one or more cells based on the measurement information and the execution condition information.

[0006] In addition, for the mobility management method according to one aspect of the present disclosure, the execution condition information includes first execution condition information related to L1 measurement and / or second execution condition information related to L3 measurement. Determining to access one or more target cells in one or more of the one or more cells based on the measurement information and the execution condition information includes: determining to access one or more target cells in one or more of the one or more cells based on the measurement information and the first execution condition information; and / or determining to access one or more target cells in one or more of the one or more cells based on the measurement information, the first execution condition information, and the second execution condition information.

[0007] In addition, in the mobility management method according to an aspect of the present disclosure, determining one or more target cells to access among one or more cells based on measurement information, first execution condition information, and second execution condition information includes: determining one or more target cells to access among one or more cells when the measurement information satisfies the first execution condition information and the second execution condition information; and / or when the measurement information satisfies the second execution condition information, further determining whether the measurement information satisfies the first execution condition information, and determining one or more target cells to access among one or more cells when the measurement information satisfies the first execution condition information.

[0008] In addition, in the mobility management method according to an aspect of the present disclosure, the execution condition information includes a plurality of execution condition information corresponding to a plurality of cell types, the plurality of cell types including a primary cell, a primary-secondary cell, and a secondary cell, and the execution condition information further includes measurement offset information corresponding to the plurality of cell types.

[0009] In addition, in the mobility management method according to an aspect of the present disclosure, it further includes: accessing one or more target cells based on the types and indexes of the one or more target cells.

[0010] According to another aspect of the present disclosure, there is provided a mobility management method for a network device, including: sending a mobility management message, the mobility management message at least including measurement configuration information of one or more cells and execution condition information; wherein, the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement, the execution condition information includes a plurality of execution condition information corresponding to a plurality of cell types, the plurality of cell types including a primary cell, a primary-secondary cell, and a secondary cell, and the execution condition information further includes measurement offset information corresponding to the plurality of cell types.

[0011] According to still another aspect of the present disclosure, there is provided a mobility management apparatus, including: a receiving unit configured to receive a mobility management message, the mobility management message at least including measurement configuration information of one or more cells and execution condition information; an obtaining unit configured to obtain measurement information of one or more cells at least based on the measurement configuration information; and a determining unit configured to determine one or more target cells to access among one or more cells based on the measurement information and the execution condition information.

[0012] According to another aspect of the present disclosure, a mobility management device is provided, including: a sending unit configured to send a mobility management message, where the mobility management message at least includes measurement configuration information of one or more cells and execution condition information; wherein the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement, the execution condition information includes a plurality of execution condition information corresponding to a plurality of cell types, the plurality of cell types include a primary cell, a primary-secondary cell, and a secondary cell, and the execution condition information further includes measurement offset information corresponding to the plurality of cell types.

[0013] According to yet another aspect of the present disclosure, a terminal device is provided, including: a communication interface configured to perform wireless communication with a network device; a memory for storing computer-readable instructions; and a processor for running the computer-readable instructions, so that the terminal device executes the mobility management method as described above.

[0014] According to yet another aspect of the present disclosure, a network device is provided, including: a communication interface configured to perform wireless communication with a terminal device; a memory for storing computer-readable instructions; and a processor for running the computer-readable instructions, so that the network device executes the mobility management method as described above.

[0015] According to yet another aspect of the present disclosure, a non-transitory computer-readable storage medium is provided for storing computer-readable instructions, which when executed by a processor, cause the processor to execute the mobility management method as described above.

[0016] As will be described in detail below, according to the mobility management method, device, terminal device, network device, and storage medium of the embodiments of the present disclosure, the cell handover based on mobility management is triggered by the terminal device, reducing the handover delay and improving the robustness. Without increasing the number of candidate cells, the number of candidates for different types of cells is increased, and more accurate cell type matching is achieved without increasing the signaling transmission volume. In addition, for specific cell types and cell events, corresponding measurement offsets are set to further optimize the selection of the target cell.

[0017] It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features, and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail with reference to the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation on the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0019] Figure 1 FIG. is a schematic diagram of a communication system illustrating a mobility management method according to an embodiment of the present disclosure.

[0020] Figure 2 FIG. is a flowchart illustrating a mobility management method according to an embodiment of the present disclosure.

[0021] Figure 3 FIG. is a further flowchart illustrating a mobility management method according to an embodiment of the present disclosure.

[0022] Figure 4 FIG. is a schematic diagram of the overall process of a mobility management method according to an embodiment of the present disclosure.

[0023] Figure 5 FIG. is a block diagram of a mobility management device according to an embodiment of the present disclosure.

[0024] Figure 6 FIG. is a further block diagram of a mobility management device according to an embodiment of the present disclosure.

[0025] Figure 7 FIG. is a hardware block diagram of a terminal device according to an embodiment of the present disclosure.

[0026] Figure 8 FIG. is a hardware block diagram of a network device according to an embodiment of the present disclosure.

[0027] Figure 9 FIG. is a schematic diagram of a computer-readable storage medium according to an embodiment of the present disclosure. Detailed Embodiments

[0028] In order to make the objectives, technical solutions, and advantages of the present disclosure more apparent, exemplary embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments of the present disclosure. It should be understood that the present disclosure is not limited by the exemplary embodiments described herein.

[0029] First, refer to Figure 1Describe a communication system that applies the mobility management method according to an embodiment of the present disclosure. The technical solutions of the embodiments of the present application can be applied to various wireless communication systems, such as: Global System for Mobile Communications (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, evolved system of NR system, LTE on Unlicensed Spectrum (LTE-U) system, NR on Unlicensed Spectrum (NR-U) system, Non-Terrestrial Network (NTN) system, Universal Mobile Telecommunications System (UMTS), Wireless Local Area Network (WLAN) system, Wireless Fidelity (WiFi) system, Fifth Generation Communication (5G) system or other communication systems, etc. It is easy to understand that the communication system architecture and service scenarios described in the embodiments of the present disclosure are for more clearly explaining the technical solutions of the embodiments of the present disclosure, and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. Those of ordinary skill in the art can understand that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present disclosure are equally applicable to similar technical problems.

[0030] As Figure 1 shown, the communication system 1 that applies the mobility management method according to an embodiment of the present disclosure includes three interaction domains: terminal devices (e.g., terminal devices 11, 12), access network 20 (e.g., including network devices 21, 22), and core network 30 (e.g., including core network devices 31, 32). With the help of the communication system 1, the terminal devices 11, 12 can perform data communication with an external data network (e.g., but not limited to the Internet).

[0031] The terminal devices 11, 12 may refer to that the terminal can be a User Equipment (UE), access terminal, user unit, user station, mobile station, mobile device, remote station, remote terminal, mobile device, user terminal, intelligent terminal, wireless communication device, user agent or user device. The terminal can also be a cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, relay device, vehicle-mounted device, wearable device, terminal in a next-generation communication system such as an NR network or a terminal in a future evolved Public Land Mobile Network (PLMN), etc., without specific limitation thereto.

[0032] The network devices 21 and 22 can be devices used for communication with the terminal devices 11 and 12. The network devices 21 and 22 can be base transceiver stations (BTSs) in a GSM or CDMA communication system, node Bs (NBs) in a WCDMA communication system, evolved node Bs (eNBs or eNodeBs) in an LTE communication system, next generation evolved node Bs (ng eNBs) in an NR communication system, or next generation node Bs (gNBs) in an NR communication system. Additionally, the network devices 21 and 22 can also be access points (APs) in a wireless local area network (WLAN), relay stations, network devices in a future evolved PLMN network, or network devices in an NTN network, etc. It should be noted that in some network deployments, the network device can be an independent node to implement all the functions of the above base stations; it can include a central unit (CU) and a distributed unit (DU), such as gNB CU and gNB DU, and can also include an active antenna unit (AAU). Among them, the CU can implement some functions of the network device, and the DU can implement some functions of the network device. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) layer, service data adaptation (SDAP) layer, and packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer. Additionally, the AAU implements some physical layer processing functions, radio frequency processing, and related functions of active antennas. Since the information in the RRC layer will ultimately become the information in the PHY layer, or be transformed from the information in the PHY layer, in this network deployment, the high-layer signaling (RRC) can be considered to be sent by the DU, or sent by the DU and the AAU. It can be understood that the network devices 21 and 22 can include at least one of the CU, DU, and AAU.

[0033] The functions of the core network devices 31 and 32 are mainly to provide user connections, manage users, and bear services, and to provide an interface to the external network as a bearer network. For example, the core network devices in a 5G NR system may include devices such as an Access and Mobility Management Function (AMF) entity, a User Plane Function (UPF) entity, and a Session Management Function (SMF) entity.

[0034] In Figure 1 In the example shown, the access network devices 21 and 22 communicate with the core network devices 31 and 32 via a certain air interface technology, such as the NG interface in a 5G NR system. The access network devices 21 and 22 communicate with the terminal devices 11 and 12 via a certain air interface technology, such as the Uu interface.

[0035] The mobility management method according to an embodiment of the present disclosure will be further described with reference to the accompanying drawings below. The mobility management method according to an embodiment of the present disclosure may be executed alone or jointly by the terminal devices 11 and 12 and the access network devices 21 and 22 as Figure 1 shown.

[0036] Figure 2 FIG. is a flowchart illustrating the mobility management method according to an embodiment of the present disclosure. Figure 2 The mobility management method according to an embodiment of the present disclosure shown is executed, for example, by the terminal devices 11 and 12 described with reference to Figure 1 the description.

[0037] In step S201, a mobility management message is received.

[0038] In an embodiment of the present disclosure, the terminal device receives a mobility management message from a network device. Specifically, the terminal device receives the mobility management message sent down by the current serving gNB-CU. Specifically, the mobility management message includes at least measurement configuration information of one or more cells and execution condition information. Further, the mobility management message further includes channel state information reporting configuration information.

[0039] One or more cells may include one or more current serving cells, cell groups, candidate cells, and candidate cell groups. For example, in dual connectivity, a terminal device may be connected to two cell groups, namely the master cell group (MCG) and the secondary cell group (SCG). In the MCG, there may be many cells, and one of them is used to initiate the initial access, which is called the primary cell (PCell). The MCG also includes secondary cells (SCells). Correspondingly, the SCG includes the primary secondary cell (PSCell) and secondary cells (SCells). The PCell in the MCG and the SCell in the MCG are combined through carrier aggregation (CA). Similarly, the PSCell in the SCG and the SCell in the SCG are also combined through carrier aggregation (CA). In addition, as described above, one or more cells may also be the CU and DU of the serving cell and / or candidate cell. The measurement configuration information of one or more cells is used to carry its mobility measurement configuration parameters, such as cell index, CU index, DU index, cell group index\list.

[0040] The channel state information reporting configuration information includes the first channel state information reporting configuration information (CSI Report Configuration 1) and the second channel state information reporting configuration information (CSI Report Configuration 2). The first channel state information reporting configuration information indicates that the measurement reference signal is the reference signal of the serving cell, and the second channel state information reporting configuration information indicates that the measurement reference signal is the reference signal of the candidate cell.

[0041] The execution condition information is used to measure the measurement results of one or more cells in order to determine whether to access one or more target cells in one or more cells. The execution condition information includes measurement bias information corresponding to multiple cell types (PCell, PSCell, Scell). That is, without increasing the number of candidate cells, the number of candidates for different types of cells is increased.

[0042] In step S202, obtain the measurement information of one or more cells based at least on the measurement configuration information. The measurement information may include the measured value of the reference signal received power (RSRP), the measured value of the reference signal received quality (RSRQ), the measured value of the signal-to-interference-plus-noise ratio (SINR), the channel quality, the signal quality, etc.

[0043] In step S203, determine to access one or more target cells in one or more cells based on the measurement information and the execution condition information.

[0044] In an embodiment of the present disclosure, the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement. One or more target cells in one or more cells can be determined based on the measurement information and the first execution condition information. That is to say, according to the first execution condition information, it is directly determined to perform handover, that is, to access one or more target cells in one or more cells.

[0045] In an exemplary embodiment of the present disclosure, the measurement information is, for example, a measured value of the reference signal received power (RSRP). The first execution condition information can be at least one of the following.

[0046] For example, the first set of conditions can be:

[0047] The most recent N measurements of L1-RSRP(c) - L1-RSRP(s) ≥ Th1;

[0048] L1-RSRP(c) - L1-RSRP(s) ≥ Th2 within a predetermined time;

[0049] Where L1-RSRP(s) is the largest L1-RSRP among the L1-RSRPs of the measurement reference signals when the measurement reference signal is the reference signal of the serving cell, and L1-RSRP(c) is the largest L1-RSRP among the L1-RSRPs of the measurement reference signals when the measurement reference signal is the reference signal of the candidate cell. Th1 and Th2 are predetermined threshold amounts, and Th1 and Th2 can be the same or different.

[0050] The first set of conditions indicates that the quality of the candidate cell is better than that of the current serving cell to a certain extent.

[0051] For example, the second set of conditions can be:

[0052] The most recent N measurements of L1-RSRP(c) ≥ Th3;

[0053] L1-RSRP(c) ≥ Th4 within a predetermined time;

[0054] The second set of conditions indicates that the quality of the candidate cell is better than a certain extent.

[0055] For example, the third set of conditions can be:

[0056] L1-RSRP(s) t1 -L1-RSRP(s) t2 ≥ Th5;

[0057] The third set of conditions indicates a sudden drop in the quality of the serving cell.

[0058] Alternatively, based on the measurement information, the first execution condition information, and the second execution condition information, determining to access one or more target cells among one or more cells may also be, when the measurement information meets the second execution condition information, further determining whether the measurement information meets the first execution condition information, and when the measurement information meets the first execution condition information, determining to perform a handover, that is, accessing one or more target cells among one or more cells. That is to say, the measurement information meeting the second execution condition information is used as the condition for further determining whether the measurement information meets the first execution condition information.

[0059] In an exemplary embodiment of the present disclosure, the first execution condition information may be at least one of the above. The second execution condition information may be any one of measurement events A3, A4, A5, and B1. For example, the measurement event A3 indicates that the quality of the co-frequency / heterogeneous frequency candidate cell is higher than that of the serving cell; A4 indicates that the quality of the heterogeneous frequency candidate cell is higher than a certain threshold; A5 indicates that the quality of the serving cell is lower than a certain threshold and the quality of the candidate cell is higher than a certain threshold; B1 indicates that the quality of the heterogeneous system candidate cell is higher than a certain threshold.

[0060] Alternatively, based on the measurement information, the first execution condition information, and the second execution condition information, determine to access one or more target cells among one or more cells. Further, based on the measurement information, the first execution condition information, and the second execution condition information, determining to access one or more target cells among one or more cells may be, when the measurement information meets the first execution condition information and the second execution condition information, determining to access one or more target cells among one or more cells. That is to say, when both the first execution condition information and the second execution condition are met, determine to perform a handover, that is, access one or more target cells among one or more cells.

[0061] In an exemplary embodiment of the present disclosure, the first execution condition information and the second execution condition information may be at least one of the above.

[0062] In the above embodiments of the present disclosure, the measurement and condition measurement of the first execution condition information are triggered based on the measurement information that meets the second execution condition information, further ensuring the robustness of the mobility handover.

[0063] In a further exemplary embodiment of the present disclosure, the execution condition information further includes measurement bias information corresponding to multiple cell types and / or cell events. When performing measurement and execution of a handover based on the measurement information and the execution condition information, the measurement information, the measurement bias information, and the threshold in the above execution condition information are jointly used in the measurement process.

[0064] For example, the same candidate cell may correspond to different types (i.e., one or more of PCell, PSCell, Scell), and different measurement offsets Offset_type1, Offset_type2, and Offset_type3 may be set for different types. In addition, if the candidate cell already has a timing advance (TA), this cell is preferentially selected; if the candidate cell has completed downlink synchronization, this cell is preferentially selected; if the candidate cell has completed tracking reference signal (TRS) tracking, this cell is preferentially selected. For the above specific cell events, different measurement offsets Offset_event1, Offset_event2, and Offset_event3 may be set.

[0065] For example, for the primary cell, the measurement result of the currently serving primary cell is Mp, the type offset Offset_type1p of the currently serving primary cell, the event offset Offset_event1p of the currently serving primary cell, the measurement result of the candidate cell is Mn, the candidate type offset Offset_type1n, and the event offset Offset_event2n of the candidate cell. When the following conditions are met:

[0066] Mn + Offset_type1n + Offset_event2n > Mp + Offset_type1p + Offset_event1p, it is determined to switch the serving primary cell to this candidate cell.

[0067] In step S204, access one or more target cells based on the types and indexes of the one or more target cells.

[0068] In an exemplary embodiment of the present disclosure, according to the determination result in step S203, that is, the cell types (PCell, PSCell, Scell) of the one or more target cells to be accessed, apply the configurations corresponding to the target cells so as to access the determined one or more target cells.

[0069] For example, if the CU and DU indexes in the execution condition information corresponding to the target cell are the same as those of the current serving cell, it is determined that the cell meeting the condition belongs to the serving DU, and an intra-DU handover and / or an intra-CU handover needs to be performed. In this case, the terminal device performs partial MAC reconstruction.

[0070] If the CU index in the execution condition corresponding to the target cell is the same as that of the current serving cell and the DU index is different from that of the current serving cell, it is determined that the cell meeting the condition belongs to the serving CU, and an inter-DU handover and an intra-CU handover need to be performed. In this case, the terminal device performs radio link control protocol (RLC) reset and partial or full MAC reconstruction.

[0071] If the CU index in the execution condition corresponding to the target cell is inconsistent with that of the current serving cell, it is determined that the target cell meeting the condition does not belong to the serving CU, and an inter-CU handover needs to be performed. In this case, RLC reset, partial or full MAC reconstruction, and Packet Data Convergence Protocol (PDCP) reset are performed.

[0072] By referring to Figure 2 the mobility management method according to the present disclosure described, the cell handover based on mobility management triggered by the terminal device reduces the handover latency and improves the robustness. Without increasing the number of candidate cells, the number of candidates for different types of cells is increased, and more accurate cell type matching is achieved without increasing the signaling transmission volume. In addition, for specific cell types and cell events, corresponding measurement biases are set to further optimize the selection of the target cell.

[0073] Figure 3 is a flowchart further illustrating the mobility management method according to an embodiment of the present disclosure. Figure 3 The mobility management method according to the embodiment of the present disclosure shown is executed, for example, by the network devices 21 and 22 referred to Figure 1 described.

[0074] In step S301, a mobility management message is sent.

[0075] In an embodiment of the present disclosure, the network device sends a mobility management message to the terminal device. Specifically, the current serving gNB-CU sends a mobility management message to the terminal device. Specifically, the mobility management message includes at least measurement configuration information and execution condition information of one or more cells. Further, the mobility management message further includes channel state information reporting configuration information.

[0076] One or more cells may include one or more current serving cells, cell groups, candidate cells, and candidate cell groups. For example, in dual connectivity, a terminal device may be connected to two cell groups, namely the master cell group (MCG) and the secondary cell group (SCG). In the MCG, there may be many cells, and one of them is used to initiate initial access, which is called the primary cell (PCell). The MCG also includes secondary cells (SCells). Correspondingly, the SCG includes a primary secondary cell (PSCell) and secondary cells (SCells). The PCell in the MCG and the SCell in the MCG are combined through carrier aggregation (CA). Similarly, the PSCell in the SCG and the SCell in the SCG are also combined through carrier aggregation (CA). In addition, as described above, one or more cells may also be the CU and DU of serving cells and / or candidate cells. The measurement configuration information of one or more cells is used to carry its mobility measurement configuration parameters, such as cell index, CU index, DU index, cell group index\list.

[0077] The channel state information reporting configuration information includes first channel state information reporting configuration information (CSI Report Configuration 1) and second channel state information reporting configuration information (CSI Report Configuration 2). The first channel state information reporting configuration information indicates that the measurement reference signal is the reference signal of the serving cell, and the second channel state information reporting configuration information indicates that the measurement reference signal is the reference signal of the candidate cell.

[0078] The execution condition information is used to measure the measurement results of one or more cells in order to determine whether to access one or more target cells among one or more cells. The execution condition information includes measurement bias information corresponding to multiple cell types (PCell, PSCell, Scell). That is, without increasing the number of candidate cells, the number of candidates for different types of cells is increased.

[0079] Figure 4 It is a schematic diagram showing the overall process of the mobility management method according to an embodiment of the present disclosure.

[0080] As Figure 4 shown, in step 401, the UE (i.e., the terminal device) reports the layer 3 measurement results to the current serving gNB-CU.

[0081] In step 402, the serving gNB-CU determines to trigger a layer 1 / layer 2 triggered mobility (LTM) process.

[0082] In step 403, the serving gNB-CU sends a UE context modification request to the DU to which the candidate cell belongs. The UE context modification request includes, for example, the candidate cell ID. Alternatively, in the case where the DU to which the candidate cell belongs is not a DU under the same CU, a UE context modification request is sent to another CU.

[0083] In step 404, the DU to which the candidate cell belongs sends a UE context modification response to the serving gNB-CU. The UE context modification response includes, for example, candidate cell-related configurations, measurement configurations, etc.

[0084] In steps 405 and 406, the serving gNB-CU sends a Radio Resource Control (RRC) reconfiguration message to the UE via the serving gNB-DU. The RRC reconfiguration message includes, for example, the measurement configuration information and execution condition information described above with reference to Figure 2 and Figure 3 the description.

[0085] In step S407, the UE evaluates the LTM execution conditions. For example, the UE obtains measurement information of one or more cells based at least on measurement configuration information. The measurement information may include measurement values of reference signal received power (RSRP), measurement values of reference signal received quality (RSRQ), measurement values of signal-to-interference-plus-noise ratio (SINR), channel quality, signal quality, etc. Further, based on the measurement information and the execution condition information, one or more target cells in one or more cells are determined for access. In an embodiment of the present disclosure, the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement. One or more target cells in one or more cells can be determined for access based on the measurement information and the first execution condition information. That is, according to the first execution condition information, it is directly determined to perform handover, that is, access one or more target cells in one or more cells. Alternatively, based on the measurement information, the first execution condition information, and the second execution condition information, determining one or more target cells in one or more cells for access may also be that when the measurement information satisfies the second execution condition information, it is further determined whether the measurement information satisfies the first execution condition information, and when the measurement information satisfies the first execution condition information, it is determined to perform handover, that is, access one or more target cells in one or more cells. That is, the measurement information satisfying the second execution condition information is used as a condition for further determining whether the measurement information satisfies the first execution condition information. Alternatively, based on the measurement information, the first execution condition information, and the second execution condition information, determining one or more target cells in one or more cells for access. Further, based on the measurement information, the first execution condition information, and the second execution condition information, determining one or more target cells in one or more cells for access may be that when the measurement information satisfies the first execution condition information and the second execution condition information, it is determined to access one or more target cells in one or more cells. That is, when both the first execution condition information and the second execution condition information are satisfied, it is determined to perform handover, that is, access one or more target cells in one or more cells. The first execution condition information and the second execution condition information are the same as those described above with reference to Figure 2 The description is the same, and its repeated description will be omitted here.

[0086] In step 408, the UE performs LTM cell handover. Based on the types and indexes of one or more target cells, one or more target cells are accessed.

[0087] In an exemplary embodiment of the present disclosure, according to the determination result in step 407, that is, the cell types (PCell, PSCell, Scell) of one or more target cells to be accessed, the configuration corresponding to the target cell is applied to access the determined one or more target cells.

[0088] For example, if the CU and DU indexes in the execution condition information corresponding to the target cell are the same as those of the current serving cell, it is determined that the cell meeting the condition belongs to the serving DU, and an intra-DU handover and / or an intra-CU handover needs to be performed. In this case, the terminal device performs partial MAC reconstruction.

[0089] If the CU index in the execution condition corresponding to the target cell is the same as that of the current serving cell and the DU index is different from that of the current serving cell, it is determined that the cell meeting the condition belongs to the serving CU, and an inter-DU handover and an intra-CU handover need to be performed. In this case, the terminal device performs radio link control protocol (RLC) reset and partial or all MAC reconstruction.

[0090] If the CU index in the execution condition corresponding to the target cell is different from that of the current serving cell, it is determined that the target cell meeting the condition does not belong to the serving CU, and an inter-CU handover needs to be performed. In this case, RLC reset, partial or all MAC reconstruction, and packet data convergence protocol (PDCP) reset are performed.

[0091] Figure 5 FIG. is a block diagram of a mobility management device according to an embodiment of the present disclosure. Figure 5 The illustrated mobility management device 500 can implement the mobility management method as described above. The mobility management device 500 can be implemented in various ways by hardware alone, software alone, or a combination thereof, and the present disclosure is not limited to any of them. The mobility management device 500 according to an embodiment of the present disclosure can be deployed in the terminal devices 11 and 12 as described above. Alternatively, the mobility management device 500 can be the terminal devices 11 and 12 as described above.

[0092] As Figure 5 shown, the mobility management device 500 includes a receiving unit 501, an obtaining unit 502, and a determining unit 503.

[0093] The receiving unit 501 is configured to receive a mobility management message, which at least includes measurement configuration information and execution condition information of one or more cells.

[0094] The obtaining unit 502 is configured to obtain measurement information of one or more cells at least based on the measurement configuration information.

[0095] The determining unit 503 is configured to determine one or more target cells for accessing one or more cells based on the measurement information and the execution condition information.

[0096] As described above, the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement. The determination unit 503 determines one or more target cells to access in one or more cells based on the measurement information and the first execution condition information; and / or determines one or more target cells to access in one or more cells based on the measurement information, the first execution condition information, and the second execution condition information. More specifically, in the case of determining one or more target cells to access in one or more cells based on the measurement information, the first execution condition information, and the second execution condition information, the determination unit 503 determines to access one or more target cells in one or more cells when the measurement information satisfies the first execution condition information and the second execution condition information; or when the measurement information satisfies the second execution condition information, further determines whether the measurement information satisfies the first execution condition information, and when the measurement information satisfies the first execution condition information, determines to access one or more target cells in one or more cells.

[0097] In addition, the mobility management device 500 may further include an access unit (not shown), configured to access one or more target cells based on the types and indexes of the one or more target cells.

[0098] Figure 6 It is a block diagram further illustrating a mobility management device according to an embodiment of the present disclosure. Figure 6 The illustrated mobility management device 600 can implement the mobility management method as described above. The mobility management device 600 can be implemented in various ways by hardware alone, software alone, or a combination thereof, and the present disclosure is not limited to any of them. The mobility management device 600 according to an embodiment of the present disclosure can be deployed in the network devices 21 and 22 as described above. Alternatively, the mobility management device 600 can be the network devices 21 and 22 as described above.

[0099] As Figure 6 As shown, the mobility management device 600 includes a sending unit 601.

[0100] The sending unit 601 is configured to send a mobility management message. The mobility management message includes at least measurement configuration information of one or more cells and execution condition information; wherein, the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement, the execution condition information includes multiple execution condition information corresponding to multiple cell types, the multiple cell types include a primary cell, a primary-secondary cell, and a secondary cell, and the execution condition information further includes measurement offset information corresponding to the multiple cell types.

[0101] Figure 7It is a hardware block diagram of a terminal device according to an embodiment of the present disclosure. The terminal device 700 includes a processor 701, a memory 702, and a communication interface 703. The processor 701, the memory 702, and the communication interface 703 are interconnected via a bus 704.

[0102] The communication interface 703 is used to perform wireless communication with a network device. The communication interface 703 can be a communication chip.

[0103] The memory 702 is used to store computer-readable instructions. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. The volatile memory can include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory can include, for example, read-only memory (ROM), hard disk, flash memory, optical disc, magnetic disk, etc.

[0104] The processor 701 is used to run the computer-readable instructions, so that the terminal device 700 executes the mobility management method described above.

[0105] Figure 8 It is a hardware block diagram of a network device according to an embodiment of the present disclosure. The network device 800 includes a processor 801, a memory 802, and a communication interface 803. The processor 801, the memory 802, and the communication interface 803 are interconnected via a bus 804.

[0106] The communication interface 803 is used to perform wireless communication with a terminal device. The communication interface 803 can be a communication chip.

[0107] The memory 802 is used to store computer-readable instructions. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. The volatile memory can include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory can include, for example, read-only memory (ROM), hard disk, flash memory, optical disc, magnetic disk, etc.

[0108] The processor 801 is used to run the computer-readable instructions, so that the network device 800 executes the mobility management method described above.

[0109] Figure 9 It is a schematic diagram of a computer-readable storage medium according to an embodiment of the present disclosure. As Figure 9As shown, a computer-readable storage medium 900 according to an embodiment of the present disclosure stores computer-readable instructions 901 thereon. When the computer-readable instructions 901 are run by a processor, a mobility management method described with reference to the above drawings is executed. The computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, optical disc, magnetic disk, etc.

[0110] As described above, a mobility management method, apparatus, terminal device, network device, and storage medium according to an embodiment of the present disclosure have been described with reference to the drawings. In the mobility management method according to an embodiment of the present disclosure, a cell handover based on mobility management is triggered by a terminal device, reducing the handover latency and improving the robustness. Without increasing the number of candidate cells, the number of candidates for different types of cells is increased, and a more accurate cell type matching is achieved without increasing the signaling transmission volume. In addition, for specific cell types and cell events, corresponding measurement biases are set to further optimize the selection of the target cell.

[0111] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional person can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present disclosure.

[0112] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present disclosure are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present disclosure. In addition, the above-disclosed specific details are only for the purpose of illustration and facilitating understanding, and are not limitations. The above details do not limit the present disclosure to necessarily adopt the above specific details for implementation.

[0113] The block diagrams of devices, apparatuses, equipment, and systems involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the phrase "and / or", and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0114] In addition, as used herein, the "or" used in the listing of items starting with "at least one" indicates a disjunctive listing. For example, the listing of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the term "exemplary" does not mean that the examples described are preferred or better than other examples.

[0115] It should also be noted that in the systems and methods of this disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of this disclosure.

[0116] Various changes, substitutions, and alterations to the technologies described herein can be made without departing from the teachings defined by the appended claims. In addition, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and acts described above. Current or later-developed processes, machines, manufactures, compositions of events, means, methods, or acts that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Thus, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or acts within their scope.

[0117] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0118] The foregoing description has been presented for purposes of illustration and description. In addition, this description is not intended to limit embodiments of the present disclosure to the form disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

Claims

1. A mobility management method for a terminal device, characterized in that, Comprising: Receiving a mobility management message, the mobility management message at least including measurement configuration information of one or more cells and execution condition information; Obtaining measurement information of the one or more cells at least based on the measurement configuration information; And Based on the measurement information and the execution condition information, determining to access one or more target cells among the one or more cells.

2. The mobility management method according to claim 1, wherein The execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement. The determining to access one or more target cells among the one or more cells based on the measurement information and the execution condition information includes: Based on the measurement information and the first execution condition information, determining to access one or more target cells among the one or more cells; and / or Based on the measurement information, the first execution condition information and the second execution condition information, determining to access one or more target cells among the one or more cells.

3. The mobility management method according to claim 2, wherein The determining to access one or more target cells among the one or more cells based on the measurement information, the first execution condition information and the second execution condition information includes: When the measurement information satisfies the first execution condition information and the second execution condition information, determining to access one or more target cells among the one or more cells; and / or When the measurement information satisfies the second execution condition information, further determining whether the measurement information satisfies the first execution condition information, and when the measurement information satisfies the first execution condition information, determining to access one or more target cells among the one or more cells.

4. The mobility management method according to any one of claims 1 to 3, characterized in that, The execution condition information includes multiple execution condition information corresponding to multiple cell types, The multiple cell types include a primary cell, a primary-secondary cell, and a secondary cell, and the execution condition information further includes measurement offset information corresponding to the multiple cell types.

5. The mobility management method according to any one of claims 1 to 3, characterized in that, Further comprising: Based on the types and indexes of the one or more target cells, accessing the one or more target cells.

6. A mobility management method for a network device, characterized in that Comprising: Sending a mobility management message, the mobility management message at least including measurement configuration information of one or more cells and execution condition information; Wherein, the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement, The execution condition information includes multiple execution condition information corresponding to multiple cell types, The multiple cell types include a primary cell, a primary-secondary cell, and a secondary cell, and the execution condition information further includes measurement offset information corresponding to the multiple cell types.

7. A mobility management device, characterized in that, Comprising: A receiving unit, configured to receive a mobility management message, the mobility management message at least including measurement configuration information of one or more cells and execution condition information; An obtaining unit, configured to obtain measurement information of the one or more cells at least based on the measurement configuration information; And A determining unit, configured to determine to access one or more target cells among the one or more cells based on the measurement information and the execution condition information.

8. A mobility management device, characterized in that, Comprising: A sending unit, configured to send a mobility management message, where the mobility management message at least includes measurement configuration information of one or more cells and execution condition information; wherein the execution condition information includes first execution condition information related to layer 1 measurement and / or second execution condition information related to layer 3 measurement, the execution condition information includes a plurality of execution condition information corresponding to a plurality of cell types, the plurality of cell types include a primary cell, a primary-secondary cell, and a secondary cell, and the execution condition information further includes measurement offset information corresponding to the plurality of cell types.

9. A terminal device, characterized in that, Comprising: A communication interface, configured to perform wireless communication with a network device; A memory, for storing computer-readable instructions; And A processor, for running the computer-readable instructions, so that the terminal device executes the mobility management method according to any one of claims 1 to 5.

10. A network device, characterized in that, Comprising: A communication interface, configured to perform wireless communication with a terminal device; A memory, for storing computer-readable instructions; And A processor, for running the computer-readable instructions, so that the network device executes the mobility management method according to claim 6.

11. A non-transitory computer-readable storage medium for storing computer-readable instructions, characterized in that, When the computer-readable instructions are executed by the processor, the processor is caused to execute the mobility management method according to any one of claims 1 to 6.

Images