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

Abstract

The present invention relates to the technical field of wireless communications, and in particular to a mobility management method and apparatus, a terminal device, a network device, and a storage medium. The method comprises: receiving a mobility management message, wherein the mobility management message at least comprises measurement configuration information of one or more cells and execution condition information; acquiring measurement information of the one or more cells at least on the basis of the measurement configuration information; and on the basis of the measurement information and the execution condition information, determining to access one or more target cells among the one or more cells. Cell handover based on mobility management is triggered by a terminal device, thereby reducing the handover delay and improving robustness.

Description

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

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims the priority of Chinese patent application with application number 202410101474.9 and application date January 24, 2024. The entire content of this Chinese patent application is incorporated herein by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of mobile communication technologies, and in particular to a mobility management method, apparatus, terminal equipment, network equipment, and storage medium. Background Art

[0004] In the field of mobile communication technology, terminal devices that are currently using network services may face the problem of current network service interruption or quality degradation due to factors such as mobility requirements, wireless transmission service load adjustment, activation operation and maintenance, equipment failure, and cell load. The existing solution introduces a cross-cell mobility mechanism based on layer 1 (L1) / layer 2 (L2) signaling, that is, switching is completed based on L1 / L2 signaling to reduce latency. For example, the terminal device will perform L1 measurement on the configured reference signal according to the configuration on the network side, and then report the indexes of K reference signals of N cells and / or L1-reference signal received power (L1-RSRP) to the network side according to the reporting configuration. In other words, based on the measured signal conditions, the terminal device reports N×K measurement results.

[0005] Although the L1 / L2 measurement reporting and subsequent MAC CE commands have reduced latency, in the FR2 "millimeter wave" frequency band, the channel state changes faster, and the switching delay needs to be further reduced and the robustness of the switching needs to be increased. Summary of the Invention

[0006] In view of the above problems, the present disclosure provides a mobility management method, apparatus, terminal device, network device and storage medium.

[0007] According to a first aspect of the present disclosure, a mobility management method is provided, which is executed by a terminal device, including: receiving a mobility management message, the mobility management message including at least measurement configuration information and execution condition information of one or more cells; 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 the one or more cells based on the measurement information and the execution condition information.

[0008] In some embodiments, the execution condition information includes: at least one of first execution condition information related to layer 1 measurement and second execution condition information related to layer 3 measurement, and based on the measurement information and the execution condition information, determining access to one or more of the one or more cells includes at least one of the following: based on the measurement information and the first execution condition information, determining access to one or more target cells in the one or more cells; and based on the measurement information, the first execution condition information and the second execution condition information, determining access to one or more target cells in the one or more cells.

[0009] In some embodiments, based on the measurement information, the first execution condition information and the second execution condition information, determining access to one or more target cells among the one or more cells includes at least one of the following: in response to the measurement information satisfying the first execution condition information and the second execution condition information, determining access to one or more target cells among the one or more cells; and in response to the measurement information satisfying the second execution condition information, judging whether the measurement information satisfies the first execution condition information, and in response to the measurement information satisfying the first execution condition information, determining access to one or more target cells among the one or more cells.

[0010] In some embodiments, the execution condition information includes multiple execution condition information corresponding to multiple cell types, the multiple cell types include primary cell, primary secondary cell, and secondary cell, and the execution condition information also includes measurement bias information corresponding to the multiple cell types.

[0011] In some embodiments, the method further includes: accessing one or more target cells based on the type and index of the one or more target cells.

[0012] According to a second aspect of the present disclosure, a mobility management method is provided, which is executed by a network device, including: sending a mobility management message, the mobility management message including at least measurement configuration information and execution condition information of one or more cells, wherein the measurement configuration information is used for the terminal device to obtain measurement information of the one or more cells, and based on the measurement information and the execution condition information, determine to access one or more target cells in the one or more cells.

[0013] According to a third aspect of the present disclosure, a mobility management device is provided, comprising: a receiving unit configured to receive a mobility management message, the mobility management message including at least measurement configuration information and execution condition information of one or more cells; an acquiring unit configured to acquire measurement information of one or more cells based at least on the measurement configuration information; and a determining unit configured to determine to access one or more target cells in the one or more cells based on the measurement information and the execution condition information.

[0014] According to a fourth aspect of the present disclosure, a mobility management device is provided, including: a sending unit, configured to send a mobility management message, the mobility management message including at least measurement configuration information and execution condition information of one or more cells, wherein the measurement configuration information is used for a terminal device to obtain measurement information of the one or more cells, and based on the measurement information and the execution condition information, determine to access one or more target cells in the one or more cells.

[0015] According to the fifth aspect of the present disclosure, a terminal device is provided, 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 described in the first aspect above.

[0016] According to the sixth aspect of the present disclosure, a network device is provided, 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 described in the second aspect above.

[0017] According to a seventh aspect of the present disclosure, a non-transitory computer-readable storage medium is provided for storing computer-readable instructions. When the computer-readable instructions are executed by a processor, the processor executes the mobility management method as described in the first aspect above.

[0018] According to the technical solutions provided by the embodiments of the present disclosure, mobility management-based cell handover is triggered by the terminal device, reducing handover latency and improving robustness. While not increasing the number of candidate cells, the number of candidate cells of different types is also increased, and more accurate cell type matching is achieved without increasing signaling transmission volume. Furthermore, corresponding measurement biases are set for specific cell types and cell events, further optimizing target cell selection.

[0019] 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 technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other purposes, features, and advantages of the present disclosure will become more apparent through a more detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings. The accompanying drawings are intended 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 are not intended to limit the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0021] FIG1 is a schematic diagram illustrating a communication system to which a mobility management method according to an embodiment of the present disclosure is applied.

[0022] FIG2 is a flowchart illustrating a mobility management method according to an embodiment of the present disclosure.

[0023] FIG3 is a flowchart further illustrating a mobility management method according to an embodiment of the present disclosure.

[0024] FIG4 is a schematic diagram illustrating an overall flow of a mobility management method according to an embodiment of the present disclosure.

[0025] FIG5 is a block diagram illustrating a mobility management apparatus according to an embodiment of the present disclosure.

[0026] FIG6 is a block diagram further illustrating a mobility management apparatus according to an embodiment of the present disclosure.

[0027] FIG7 is a hardware block diagram illustrating a terminal device according to an embodiment of the present disclosure.

[0028] FIG8 is a hardware block diagram illustrating a network device according to an embodiment of the present disclosure.

[0029] FIG9 is a schematic diagram illustrating a computer-readable storage medium according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present disclosure more apparent, the following will describe in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described herein.

[0031] First, a communication system for applying the mobility management method according to an embodiment of the present disclosure is described with reference to FIG1 . The technical solution of the embodiment of the present application can be applied to various wireless communication systems, such as: global mobile communication (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, evolution system of NR system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-U) system, non-terrestrial communication network (NTN) system, universal mobile telecommunication system (UMTS), wireless local area network (WLAN) system, wireless fidelity (WiFi) system, fifth generation communication (5G) system or other communication systems. It is easy to understand that the communication system architecture and service scenarios described in the embodiment of the present disclosure are for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and do not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. Those skilled in the art can understand that with the evolution of network architecture and the emergence of new service scenarios, the technical solution provided in the embodiment of the present disclosure is also applicable to similar technical problems.

[0032] As shown in Figure 1, communication system 1 includes three interaction domains: terminal devices (e.g., terminal devices 11 and 12), access network 20 (e.g., including network devices 21 and 22), and core network 30 (e.g., including core network devices 31 and 32). Through communication system 1, terminal devices 11 and 12 can perform data communications with external data networks (e.g., but not limited to the Internet).

[0033] The terminal devices 11 and 12 may be user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, intelligent terminal, wireless communication device, user agent or user device. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a relay device, a vehicle-mounted device, a wearable device, a 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.

[0034] The network devices 21 and 22 may be devices for communicating with the terminal devices 11 and 12. The network devices 21 and 22 may be base transceiver stations (BTS) in GSM or CDMA communication systems, base stations (nodeB, NB) in WCDMA communication systems, evolutionary node Bs (eNB or eNodeB) in LTE communication systems, next generation evolved node Bs (ng-eNB) in NR communication systems, and next generation node Bs (gNB) in NR communication systems. In addition, the network devices 21 and 22 may also be access points (APs) in wireless local area networks (WLANs), relay stations, network devices in future evolved PLMN networks, or network devices in NTN networks. It should be noted that in some network deployments, the network device may be an independent node to implement all the functions of the above-mentioned base stations; it may include a centralized unit (CU) and a distributed unit (DU), such as a gNB-CU and a gNB-DU, and may also include an active antenna unit (AAU). Among them, the CU can implement some functions of the network device, while 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 (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. In addition, the AAU implements some physical layer processing functions, radio frequency processing, and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this network deployment, the high-level signaling (RRC) can be considered to be sent by the DU, or by the DU and the AAU. It can be understood that the network devices 21 and 22 may include at least one of the CU, DU, and AAU.

[0035] The core network devices 31 and 32 are mainly used to provide user connections, user management, and service bearer services, and they act as a bearer network to provide an interface to the external network. For example, the core network devices in the 5G NR system may include an Access and Mobility Management Function (AMF) entity, a User Plane Function (UPF) entity, and a Session Management Function (SMF) entity.

[0036] In the example shown in Figure 1, access network devices 21 and 22 communicate with core network devices 31 and 32 via some over-the-air technology, such as the NG interface in a 5G NR system. Access network devices 21 and 22 communicate with terminal devices 11 and 12 via some over-the-air technology, such as the Uu interface.

[0037] The mobility management method according to the embodiment of the present disclosure will be further described below with reference to the accompanying drawings. The mobility management method according to the embodiment of the present disclosure can be executed by the terminal devices 11, 12 and the access network devices 21, 22 as shown in FIG1 individually or jointly.

[0038] Figure 2 is a flow chart illustrating a mobility management method according to an embodiment of the present disclosure. The method is executed by, for example, the terminal devices 11 and 12 described with reference to Figure 1. The method includes the following steps S201-S204.

[0039] In step S201, a mobility management message is received.

[0040] In an embodiment of the present disclosure, a terminal device receives a mobility management message from a network device. Specifically, the terminal device receives the mobility management message from its currently serving gNB-CU. Specifically, the mobility management message includes at least measurement configuration information and execution condition information for one or more cells. Furthermore, the mobility management message also includes channel state information reporting configuration information.

[0041] One or more cells may include one or more current serving cells, serving cell groups, candidate cells and candidate cell groups. For example, under dual connectivity, a terminal device can access two cell groups, namely a main cell group (MCG) and a secondary cell group (SCG). In an MCG, there may be many cells, one of which is used to initiate initial access, referred to as a main cell (PCell). The MCG also includes a secondary cell (SCell). Accordingly, the SCG includes a primary secondary cell (PSCell) and a secondary cell (SCell). The PCell in the MCG and the SCell in the MCG are combined together through carrier aggregation (CA). Similarly, the PSCell in the SCG and the SCell in the SCG are also combined together through carrier aggregation (CA). In addition, as described above, one or more cells may also be the CU and DU of a serving cell and / or a candidate cell. The measurement configuration information of one or more cells carries / includes its mobility measurement configuration parameters, such as cell index, CU index, DU index, cell group index\list.

[0042] The channel state information report configuration information includes first channel state information report configuration information (CSI Report Configuration 1) and second channel state information report configuration information (CSI Report Configuration 2). The first channel state information report configuration information indicates that the measurement reference signal is the reference signal of the serving cell, and the second channel state information report configuration information indicates that the measurement reference signal is the reference signal of the candidate cell.

[0043] Execution condition information is used to evaluate measurement results from one or more cells to determine whether to access one or more target cells from the one or more cells. The execution condition information includes measurement bias information corresponding to multiple cell types (e.g., PCell, PSCell, and Scell). This increases the number of candidate cells of different types without increasing the number of candidate cells.

[0044] In step S202, measurement information of one or more cells is obtained based at least on the measurement configuration information. In some embodiments of the present disclosure, the measurement information may include a measurement value of reference signal received power (RSRP), a measurement value of reference signal received quality (RSRQ), a measurement value of signal-to-interference-plus-noise ratio (SINR), channel quality, signal quality, etc.

[0045] In step S203, based on the measurement information and the execution condition information, it is determined to access one or more target cells among the one or more cells.

[0046] In embodiments of the present disclosure, the execution condition information includes first execution condition information related to layer 1 measurements and / or second execution condition information related to layer 3 measurements. Access to one or more target cells among the one or more cells can be determined based on the measurement information and the first execution condition information. In other words, handover execution, i.e., access to one or more target cells among the one or more cells, can be directly determined based on the first execution condition information.

[0047] In an exemplary embodiment of the present disclosure, the measurement information is, for example, a measurement value of Reference Signal Received Power (RSRP).The first execution condition information may be at least one of the following first group of conditions, second group of conditions, and third group of conditions.

[0048] For example, the first set of conditions could be:

[0049] The last N measurements of L1-RSRP(c)-L1-RSRP(s) ≥ Th1;

[0050] L1-RSRP(c)-L1-RSRP(s)≥Th2 within the predetermined time;

[0051] Where L1-RSRP(s) is the maximum L1-RSRP among the L1-RSRPs of the reference signal measured when the reference signal is the reference signal of the serving cell, and L1-RSRP(c) is the maximum L1-RSRP among the L1-RSRPs of the reference signal measured when the reference signal is the reference signal of the candidate cell. Th1 and Th2 are predetermined thresholds, which may be the same or different.

[0052] The first set of conditions indicates that the quality of the candidate cell is better than the quality of the current serving cell to a certain extent.

[0053] For example, the second set of conditions could be:

[0054] The last N times L1-RSRP(c)≥Th3;

[0055] L1-RSRP(c)≥Th4 within the predetermined time;

[0056] The second set of conditions indicates that the quality of the candidate cell is better than a certain level.

[0057] For example, the third set of conditions can be: L1-RSRP(s) t1 -L1-RSRP(s) t2 ≥Th5;

[0058] The third set of conditions indicates that the serving cell quality has dropped sharply.

[0059] Alternatively, determining access to 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 may also include, if the measurement information satisfies the second execution condition information, determining whether the measurement information satisfies the first execution condition information, and, if the measurement information satisfies the first execution condition information, determining to perform handover, i.e., access to the one or more target cells among the one or more cells. In other words, the fact that the measurement information satisfies the second execution condition information serves as a prerequisite for further determining whether the measurement information satisfies the first execution condition information.

[0060] In an exemplary embodiment of the present disclosure, the first execution condition information may be at least one of the first, second, and third groups of conditions described above. The second execution condition information may be any one of measurement events A3, A4, A5, and B1. For example, measurement event A3 indicates that the quality of the intra-frequency / inter-frequency candidate cell is higher than the quality of the serving cell; A4 indicates that the quality of the inter-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; and B1 indicates that the quality of the inter-system candidate cell is higher than a certain threshold.

[0061] Alternatively, access to one or more target cells among the one or more cells is determined based on the measurement information, the first execution condition information, and the second execution condition information. Furthermore, determining access to 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 may be determining access to one or more target cells among the one or more cells when the measurement information satisfies the first execution condition information and the second execution condition information. That is, when both the first execution condition information and the second execution condition information are satisfied, a determination is made to perform handover, i.e., access to one or more target cells among the one or more cells.

[0062] In an exemplary embodiment of the present disclosure, the first execution condition information may be at least one of the first, second, and third group conditions described above, and the second execution condition information may be at least one of the measurement events A3, A4, A5, and B1 described above.

[0063] In the above-mentioned embodiment of the present disclosure, the measurement and conditional measurement of the first execution condition information are triggered based on the measurement information satisfying the second execution condition information, thereby further ensuring the robustness of the mobility handover.

[0064] 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 a handover based on the measurement information and the execution condition information, the measurement information, the measurement bias information, and the threshold value in the execution condition information are used together to perform the weighing process.

[0065] For example, the same candidate cell can correspond to different types (i.e., one or more of PCell, PSCell, and Scell), and different measurement offsets Offset_type1, Offset_type2, and Offset_type3 can be set for different types. In addition, if a candidate cell already has a timing advance (TA), it is preferred; if a candidate cell has completed downlink synchronization, it is preferred; if a candidate cell has completed tracking reference signals (TRS), it is preferred. For the above-mentioned specific cell events, different measurement offsets Offset_event1, Offset_event2, and Offset_event3 can be set.

[0066] For example, for the primary cell, the measurement result of the current serving primary cell is Mp, the type offset of the current serving primary cell is Offset_type1p, and the event offset of the current serving primary cell is Offset_event1p. The measurement result of the candidate cell is Mn, the candidate type offset is Offset_type1n, and the event offset of the candidate cell is Offset_event2n. When Mn+Offset_type1n+Offset_event2n>Mp+Offset_type1p+Offset_event1p, it is determined that the serving primary cell will be switched to the candidate cell.

[0067] In step S204, one or more target cells are accessed based on the type and index of the one or more target cells.

[0068] In an exemplary embodiment of the present disclosure, according to the determination result in step S203, ie, the cell type (PCell, PSCell, Scell) of the access one or more target cells, the configuration corresponding to the target cell is applied to access the determined one or more target cells.

[0069] For example, if the CU and DU indexes in the target cell's corresponding execution condition information are consistent with those of the current serving cell, the cell that meets the conditions is determined to be a serving DU and needs to perform intra-DU handover and / or intra-CU handover. In this case, the terminal device performs partial MAC reconstruction.

[0070] If the CU index in the target cell's corresponding execution condition matches that of the current serving cell, but the DU index does not match that of the current serving cell, the target cell is considered to be the serving CU and requires both inter-DU and intra-CU handover. In this case, the terminal device performs a Radio Link Control (RLC) reset and a partial or full MAC re-establishment.

[0071] If the CU index in the target cell's corresponding execution condition is inconsistent with the current serving cell, the target cell that meets the conditions is determined not to be a serving CU and an inter-CU handover is required. In this case, an RLC reset, partial or full MAC reestablishment, and a Packet Data Convergence Protocol (PDCP) reset are performed.

[0072] By using the mobility management method provided by the present disclosure described with reference to FIG2 , a terminal device triggers a cell handover based on mobility management, reducing handover latency and improving robustness. While not increasing the number of candidate cells, the number of different types of candidate cells is increased, and more accurate cell type matching is achieved without increasing the amount of signaling transmission. Furthermore, for specific cell types and cell events, corresponding measurement biases are set to further optimize target cell selection.

[0073] Figure 3 is a flow chart further illustrating a mobility management method according to an embodiment of the present disclosure. The method is executed by, for example, the network devices 21 and 22 described with reference to Figure 1. The method includes the following steps S301.

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

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

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

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

[0078] Execution condition information is used to evaluate measurement results from one or more cells to determine whether to access one or more target cells from the one or more cells. The execution condition information includes measurement bias information corresponding to multiple cell types (e.g., PCell, PSCell, and Scell). This increases the number of candidate cells of different types without increasing the number of candidate cells.

[0079] FIG4 is a schematic diagram illustrating an overall flow of a mobility management method according to an embodiment of the present disclosure.

[0080] As shown in Figure 4, in step 401, the UE (i.e., 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 the Layer 1 / Layer 2 Triggered Mobility (LTM) procedure.

[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, if the DU to which the candidate cell belongs is not a subordinate DU of the same CU, the 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 may include, for example, candidate cell-related configurations and measurement configurations.

[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 Figures 2 and 3.

[0085] In step S407, the UE evaluates LTM execution conditions. For example, based at least on the measurement configuration information, the UE obtains measurement information for one or more cells. The measurement information may include a measured value of reference signal received power (RSRP), a measured value of reference signal received quality (RSRQ), a measured value of signal-to-interference-and-noise ratio (SINR), channel quality, signal quality, etc. Furthermore, based on the measurement information and the execution condition information, it is determined whether to access one or more target cells from the one or more cells. In embodiments of the present disclosure, the execution condition information includes first execution condition information related to layer 1 measurements and / or second execution condition information related to layer 3 measurements. Access to one or more target cells from the one or more cells may be determined based on the measurement information and the first execution condition information. In other words, handover execution, i.e., access to one or more target cells from the one or more cells, may be directly determined based on the first execution condition information. Alternatively, the determination to access one or more target cells from the one or more cells based on the measurement information, the first execution condition information, and the second execution condition information may be to determine, if the measurement information satisfies the second execution condition information, whether the measurement information satisfies the first execution condition information, and, if the measurement information satisfies the first execution condition information, to determine whether handover execution, i.e., access to one or more target cells from the one or more cells. That is, the measurement information satisfies the second execution condition information as a prerequisite 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, it is determined to access one or more target cells in the one or more cells. Furthermore, based on the measurement information, the first execution condition information, and the second execution condition information, determining to access one or more target cells in the one or more cells may be determining to access one or more target cells in the one or more cells when the measurement information satisfies the first execution condition information and the second execution condition information. That is, when the first execution condition information and the second execution condition are simultaneously met, it is determined to perform handover, that is, to access one or more target cells in the 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 FIG2 , and their repeated description will be omitted here.

[0086] In step 408, the UE performs LTM cell handover and accesses one or more target cells based on the type and index of the one or more target cells.

[0087] In an exemplary embodiment of the present disclosure, according to the determination result in step 407 , ie, the cell type (PCell, PSCell, Scell) of the access one or more target cells, 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 target cell's corresponding execution condition information are consistent with those of the current serving cell, the cell that meets the conditions is determined to be a serving DU and needs to perform intra-DU handover and / or intra-CU handover. In this case, the terminal device performs partial MAC reconstruction.

[0089] If the CU index in the target cell's corresponding execution condition matches that of the current serving cell, but the DU index does not match that of the current serving cell, the target cell is considered to be the serving CU and requires both inter-DU and intra-CU handover. In this case, the terminal device performs a Radio Link Control (RLC) reset and a partial or full MAC re-establishment.

[0090] If the CU index in the target cell's corresponding execution condition is inconsistent with the current serving cell, the target cell that meets the conditions is determined not to be a serving CU and an inter-CU handover is required. In this case, an RLC reset, partial or full MAC reestablishment, and a Packet Data Convergence Protocol (PDCP) reset are performed.

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

[0092] As shown in FIG5 , the mobility management device 500 includes a receiving unit 501 , an acquiring unit 502 , and a determining unit 503 .

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

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

[0095] The determining unit 503 is 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.

[0096] In some embodiments, the execution condition information includes at least one of first execution condition information related to layer 1 measurement and second execution condition information related to layer 3 measurement. The determining unit 503 is configured to perform at least one of the following: determining to access one or more target cells among the one or more cells based on the measurement information and the first execution condition information; and 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.

[0097] More specifically, in the case of determining to access one or more target cells among one or more cells based on measurement information, first execution condition information and second execution condition information, the determination unit 503 is used to perform at least one of the following: in response to the measurement information satisfying 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 in response to the measurement information satisfying the second execution condition information, judging whether the measurement information satisfies the first execution condition information, and in response to the measurement information satisfying the first execution condition information, determining to access one or more target cells among the one or more cells.

[0098] In some embodiments, the execution condition information includes multiple execution condition information corresponding to multiple cell types, including primary cell, primary secondary cell, and secondary cell, and the execution condition information also includes measurement bias information corresponding to the multiple cell types.

[0099] 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 type and index of the one or more target cells.

[0100] FIG6 is a block diagram further illustrating a mobility management apparatus according to an embodiment of the present disclosure. The mobility management apparatus 600 shown in FIG6 is capable of implementing the mobility management method described above. The mobility management apparatus 600 can be implemented in various ways, using hardware alone, software alone, or a combination thereof, and the present disclosure is not limited to any of these. The mobility management apparatus 600 according to an embodiment of the present disclosure can be deployed in the network devices 21 and 22 described above. Alternatively, the mobility management apparatus 600 can be the network devices 21 and 22 described above.

[0101] As shown in FIG6 , the mobility management device 600 includes a sending unit 601 .

[0102] 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 measurement configuration information is used for the terminal device to obtain measurement information of the one or more cells and determine one or more target cells to access from the one or more cells based on the measurement information and the execution condition information.

[0103] 7 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.

[0104] The communication interface 703 is used to perform wireless communication with the network device, and the communication interface 703 may be a communication chip.

[0105] 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 may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0106] The processor 701 is configured to execute computer-readable instructions, so that the terminal device 700 executes the mobility management method described above.

[0107] 8 is a hardware block diagram illustrating 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.

[0108] The communication interface 803 is used to perform wireless communication with the terminal device, and the communication interface 803 can be a communication chip.

[0109] 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 may include, for example, a random access memory (RAM) and / or a cache memory. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0110] The processor 801 is configured to execute computer-readable instructions, so that the network device 800 executes the mobility management method described above.

[0111] FIG9 is a schematic diagram illustrating a computer-readable storage medium according to an embodiment of the present disclosure. As shown in FIG9 , a computer-readable storage medium 900 according to an embodiment of the present disclosure has computer-readable instructions 901 stored thereon. When the computer-readable instructions 901 are executed by a processor, the mobility management method described with reference to the above figures is executed. The computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0112] The above describes the mobility management method, apparatus, terminal device, network device and storage medium according to the embodiments of the present disclosure with reference to the accompanying drawings. According to the mobility management method of the embodiments of the present disclosure, the terminal device triggers the cell switching based on mobility management, which reduces the switching delay and improves the robustness. While not increasing the number of candidate cells, the number of different types of cell candidates is increased, and without increasing the signaling transmission volume, more accurate cell type matching is achieved. In addition, for specific cell types and cell events, corresponding measurement biases are set to further optimize the selection of target cells.

[0113] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0114] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this disclosure are merely illustrative and not restrictive, and should not be construed as necessarily possessed by each embodiment of the present disclosure. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit the present disclosure to necessarily being implemented using these specific details.

[0115] The block diagrams of the devices, devices, equipment, and systems involved in this disclosure are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, 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 therewith.

[0116] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list 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 word "exemplary" does not mean that the example described is preferred or better than other examples.

[0117] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0118] Various changes, substitutions, and modifications may be made to the technology described herein without departing from the teachings defined by the appended claims. Moreover, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of things, means, methods, and actions described above. Currently existing or later developed processes, machines, manufactures, compositions of things, means, methods, or actions that perform substantially the same function or achieve substantially the same results as the corresponding aspects described herein may be utilized. Accordingly, the appended claims include within their scope such processes, machines, manufactures, compositions of things, means, methods, or actions.

[0119] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0120] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A mobility management method, executed by a terminal device, comprising: 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 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 one or more target cells to access among the one or more cells.

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

3. The mobility management method according to claim 2, wherein, The determining to access 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 includes at least one of the following: In response to the measurement information satisfying the first execution condition information and the second execution condition information, determining the one or more target cells to access among the one or more cells; And In response to the measurement information satisfying the second execution condition information, determining whether the measurement information satisfies the first execution condition information, and in response to the measurement information satisfying the first execution condition information, determining the one or more target cells to access among the one or more cells.

4. The mobility management method according to any one of claims 1 to 3, wherein, 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, wherein, Further comprising: Based on the types and indices of the one or more target cells, accessing the one or more target cells.

6. The mobility management method according to claim 2 or 3, wherein The first execution condition information includes at least one of a first set of conditions, a second set of conditions, and a third set of conditions, The first set of conditions includes: in the most recent N measurements, L1-RSRP(c)-L1-RSRP(s)≥Th1, and within a predetermined time, L1-RSRP(c)-L1-RSRP(s)≥Th2, The second set of conditions includes: in the most recent N measurements, L1-RSRP(c)≥Th3, and within a predetermined time, L1-RSRP(c)≥Th4, The third set of conditions includes: L1 - RSRP(s) t1 - L1 - RSRP(s) t2 ≥ Th5 Where L1-RSRP(s) is the maximum L1-RSRP among the multiple L1-RSRPs of multiple measurement reference signals when the measurement reference signal is the reference signal of the serving cell, L1-RSRP(c) is the maximum L1-RSRP among the multiple L1-RSRPs of the multiple measurement reference signals when the measurement reference signal is the reference signal of the candidate cell, and Th1 to Th5 are predetermined thresholds.

7. The mobility management method according to claim 2 or 3, wherein, The second execution condition information is any one of measurement events A3, A4, A5, and B1. The measurement event A3 indicates that the quality of the co-frequency candidate cell or the inter-frequency candidate cell is higher than the quality of the serving cell. The measurement event A4 indicates that the quality of the inter-frequency candidate cell is higher than the first threshold. The measurement event A5 indicates that the quality of the serving cell is lower than the second threshold and the quality of the candidate cell is higher than the third threshold, and The measurement event B1 indicates that the quality of the inter-system candidate cell is higher than the fourth threshold.

8. A mobility management method, executed by a network device, includes: Sending a mobility management message, where the mobility management message at least includes measurement configuration information of one or more cells and execution condition information, and the measurement configuration information is used for a terminal device to obtain measurement information of the one or more cells and determine to access one or more target cells among the one or more cells based on the measurement information and the execution condition information.

9. The mobility management method according to claim 8, wherein, The execution condition information includes at least one of first execution condition information related to layer 1 measurement and second execution condition information related to layer 3 measurement.

10. The mobility management method according to claim 8 or 9, wherein 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.

11. A mobility management device, includes: A receiving unit, configured to receive a mobility management message, where the mobility management message at least includes 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.

12. A mobility management device, includes: 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, and the measurement configuration information is used for a terminal device to obtain measurement information of the one or more cells and determine to access one or more target cells among the one or more cells based on the measurement information and the execution condition information.

13. A terminal device, includes: A communication interface, configured to perform wireless communication with a network device; A memory, used to store computer-readable instructions; And A processor, used to run the computer-readable instructions, so that the terminal device executes the mobility management method according to any one of claims 1 to 7.

14. A network device, 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, such that the network device executes the mobility management method according to any one of claims 8 to 10.

15. A non-transitory computer-readable storage medium for storing computer-readable instructions, wherein, 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 7.

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