Mobility management method, communication apparatus, and storage medium

Abstract

Provided are a mobility management method, a communication apparatus, and a storage medium. The mobility management method comprises: determining a terminal device allowed to be handed over to a third node; and sending a handover instruction to the terminal device allowed to be handed over to the third node, wherein the handover instruction is used for instructing to hand over the terminal device from a first node to the third node.

Description

Mobility management method, communication device, and storage medium

[0001] This disclosure claims priority to Chinese patent application No. 202310787422.7, filed on June 29, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of wireless communication technologies, and in particular to a mobility management method, a communication device, and a storage medium. Background Art

[0003] A reconfigurable intelligent surface (RIS) is an artificial electromagnetic material with programmable electromagnetic properties. It consists of a large number of low-cost reflective arrays. By controlling the phase and amplitude of each array, the direction of the outgoing beam focus can be adjusted, thereby changing the propagation path of the electromagnetic wave and achieving control over the wireless network environment.

[0004] RIS deployment typically involves deploying one or more dedicated RIS within the coverage area of ​​a single base station to improve signal quality in coverage blind spots within that base station's coverage area. In some specialized scenarios, RIS are deployed on mobile vehicles to provide signal relay and coverage for users within the vehicle. For example, on high-speed trains, transmissive RIS are deployed on vehicle windows to reflect the base station's beam into the interior of the vehicle.

[0005] Summary of the Invention

[0006] In one aspect, a mobility management method is provided, applied to a first node, comprising: determining a terminal device that is allowed to switch to a third node; and sending a switching instruction to the terminal device, the switching instruction being used to instruct the terminal device to switch from the first node to the third node.

[0007] In another aspect, a mobility management method is provided, applied to a second node. The mobility management method includes: receiving second indication information sent by a first node; the second indication information is used to instruct to replace a codebook of a target reflection module included in the second node with a target codebook; and replacing the codebook of the target reflection module with the target codebook according to the second indication information.

[0008] In another aspect, a management device is provided for use with a first node. The management device includes: a determination module configured to determine, from among terminal devices connected to the first node via a second node, terminal devices that are permitted to switch to a third node; and a switching module configured to send a switching instruction to the terminal devices permitted to switch to the third node, the switching instruction instructing the terminal devices to switch from the first node to the third node.

[0009] In yet another aspect, a management device is provided for use with a second node. The management device includes: a receiving module configured to receive second indication information sent by a first node; the second indication information being configured to instruct a codebook of a target reflection module included in the second node to be replaced with a target codebook; and a replacing module configured to replace the codebook of the target reflection module with the target codebook based on the second indication information.

[0010] In another aspect, a communication device is provided, comprising: a memory and a processor; the memory and the processor are coupled; the memory is used to store a computer program; and the processor implements the mobility management method described in any one of the above aspects when executing the computer program.

[0011] In another aspect, a computer-readable storage medium is provided, wherein computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, the mobility management method described in any one of the above aspects is implemented.

[0012] In yet another aspect, a computer program product is provided, including computer program instructions, which implement the mobility management method described in any one of the above aspects when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings.

[0014] FIG1 is a schematic diagram of the architecture of a communication system according to some embodiments of the present disclosure.

[0015] FIG2 is a schematic structural diagram of a base station according to some embodiments of the present disclosure.

[0016] FIG3 is a schematic structural diagram of a relay reflection device according to some embodiments of the present disclosure.

[0017] FIG4 is a schematic diagram of the structural form of a relay reflection device according to some embodiments of the present disclosure.

[0018] FIG5 is a schematic diagram of the structure of another relay reflection device according to some embodiments of the present disclosure.

[0019] FIG6 is a schematic diagram of an application scenario of a communication system according to some embodiments of the present disclosure.

[0020] FIG7 is a schematic diagram of an application scenario of another communication system according to some embodiments of the present disclosure.

[0021] FIG8 is a schematic diagram of an application scenario of another communication system according to some embodiments of the present disclosure.

[0022] FIG9 is a flow chart of a mobility management method according to some embodiments of the present disclosure.

[0023] FIG10 is a flow chart of another mobility management method according to some embodiments of the present disclosure.

[0024] FIG11 is a flow chart of another mobility management method according to some embodiments of the present disclosure.

[0025] FIG12 is a flow chart of another mobility management method according to some embodiments of the present disclosure.

[0026] FIG13 is a schematic diagram of an application scenario of a mobility management method according to some embodiments of the present disclosure.

[0027] FIG14 is a schematic diagram of another application scenario of a mobility management method according to some embodiments of the present disclosure.

[0028] FIG15 is a schematic structural diagram of a management device according to some embodiments of the present disclosure.

[0029] FIG16 is a schematic structural diagram of another management device according to some embodiments of the present disclosure.

[0030] FIG17 is a schematic structural diagram of another management device according to some embodiments of the present disclosure.

[0031] FIG18 is a schematic structural diagram of a communication device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0032] To help those skilled in the art better understand the technical solutions of the embodiments of the present disclosure, the technical solutions of the present disclosure will be clearly and completely described below in conjunction with the drawings in the present disclosure. Obviously, the embodiments described are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0033] It should be noted that in this disclosure, words such as "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this disclosure as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplarily" or "for example" is intended to present the relevant concepts in a concrete manner.

[0034] In the following, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, a feature defined with the terms "first," "second," etc., may explicitly or implicitly include one or more of such features.

[0035] In the description of this disclosure, unless otherwise specified, " / " means "or." For example, A / B can mean A or B. "And / or" herein is merely a description of an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: only A, only B, and both A and B. Furthermore, "at least one" means one or more, and "a plurality" means two or more.

[0036] With the explosive growth of data traffic, millimeter wave (mmWave), with its abundant available frequency bands, has become a key technology for fifth-generation mobile communications. The first significant challenge in implementing mmWave communications is path loss. To compensate for the severe path loss during mmWave transmission, mmWave base stations (BSs) typically employ large-scale antenna arrays for narrow-beam transmission, effectively concentrating transmission energy in a specific area or direction. However, mmWave directional transmission is highly sensitive to obstruction, which can even lead to connection interruptions. This poses new challenges to establishing and maintaining mmWave links. To address this, devices with signal forwarding and relaying capabilities, such as RIS and network controlled repeaters (NCRs), have been integrated into mmWave cellular systems.

[0037] RIS is an artificial electromagnetic material with programmable electromagnetic properties. It includes a large number of low-cost reflective arrays. By controlling the phase and amplitude of each array, the direction of the outgoing beam focus can be adjusted, thereby changing the propagation path of the electromagnetic wave and achieving control of the wireless network environment.

[0038] Traditional wireless technologies generally perform signal processing at the transceiver end to adapt to dynamic and uncontrollable wireless network environments. RIS, however, can proactively correct wireless channels through controllable intelligent signal reflection technology. Therefore, RIS provides new freedom for improving wireless link performance and paves the way for the realization of intelligent, programmable wireless environments. For example, in millimeter-wave cellular systems, wireless channel congestion caused by factors such as terrain or obstacles can severely degrade communication quality and even cause link interruption. RIS, with its ability to modify the electromagnetic wave transmission environment, has the potential to become a new approach to addressing millimeter-wave communication congestion. For users whose links to base stations are blocked, RIS can adjust the phase of the electromagnetic wave transmission path to bypass obstructions and reach the user, thereby improving communication quality and the coverage capability of the millimeter-wave system.

[0039] RIS deployment typically involves deploying one or more dedicated RIS within the coverage area of ​​a single base station to improve signal quality in coverage blind spots within that base station's coverage area. In some specialized scenarios, RIS are deployed on mobile vehicles to provide signal relay and coverage for users within the vehicle. For example, on high-speed trains, transmissive RIS are deployed on vehicle windows to reflect the base station's beam into the interior of the vehicle. However, the movement of the vehicle causes the RIS to move, which in turn causes the relative position between the RIS and the roadside base station antenna to continuously change, resulting in a constant change in the angular relationship between the RIS's incoming and outgoing beams. This can result in the RIS's outgoing beam being unable to stably cover UEs within the vehicle, causing significant fluctuations in UE signal quality.

[0040] At the same time, the mobility of RIS also brings new problems to the mobility performance of users served by RIS. When a mobile vehicle crosses the coverage overlap area of ​​two roadside base stations, if the RIS cannot promptly and accurately adjust the reflected beam from the source base station beam to the target base station beam, it cannot ensure that the UEs in the vehicle being relayed by the RIS can promptly discover the target base station and complete the handover process, resulting in an increased handover failure rate for UEs in the vehicle.

[0041] For example, when a UE in a mobile vehicle performs a handover process, the following problems may occur:

[0042] 1. During the inter-site process, before the RIS switches to the target cell beam, the UE can only detect the target cell beam that passes through the vehicle due to vehicle penetration loss, but cannot detect the target cell beam reflected by the RIS. Therefore, it is impossible to accurately determine whether the current environment meets the handover standard. The UE may not have enough time to perform handover, resulting in a radio link failure (RLF).

[0043] 2. During the inter-site process, after the RIS switches to the target cell beam (RIS starts reflecting the target cell beam), the UE can only detect the source cell beam that has passed through the vehicle and suffered from vehicle penetration loss. Therefore, the UE may not be able to complete the handover pre-process with the source cell (including the UE completing measurements on the source cell and target cell and reporting the measurement report to the source cell, the source cell and target cell completing handover preparation, and the UE receiving the handover command sent by the source cell), resulting in handover failure.

[0044] In summary, the problem existing in some technologies is that, in a scenario where the RIS is deployed on a mobile vehicle, the failure rate of cell switching of the UE in the vehicle is too high.

[0045] To address the above technical issues, the disclosed embodiments provide a mobility management method. The method's principle is to: before a second node changes its codebook, multiple terminal devices covered by the second node are prepared for handover in advance and obtain the access configuration of a third node. Furthermore, after the second node changes its codebook (at which point the second node's reflection module begins relaying the third node's signal), the terminal devices are allowed to access the third node again. In this way, in scenarios where the second node is deployed on a mobile vehicle, the success rate of cell handover for terminal devices within the vehicle can be improved.

[0046] 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure. As shown in FIG1 , the communication system includes: a base station 110 , a relay reflector device 120 , and a terminal device 130 .

[0047] The base station 110 is used to transmit and receive electromagnetic waves.

[0048] Exemplarily, the base station 110 may be a next generation Node B (gNB).

[0049] In some embodiments, as shown in FIG2 , a base station 110 includes a controller 111 and an antenna 112. The controller 111 is configured to manage wireless communication interfaces and wireless channels. The antenna 112 is configured to transmit and receive electromagnetic waves.

[0050] Exemplarily, the antenna 112 may transmit electromagnetic waves to the relay reflection device 120 according to the control of the controller 111 .

[0051] In some embodiments, the base station 110 may further include a communication interface 113 for exchanging information with other devices. For example, the base station 110 may exchange information with the relay reflector device 120 via the communication interface 113. The base station 110 may also exchange information with other devices such as network servers via the communication interface 113.

[0052] In some embodiments, the base station 110 may further include a memory 114 for storing data. For example, the memory 114 may be used to store a codebook.

[0053] Exemplarily, the memory 114 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store dynamic information and instructions, an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0054] The relay reflector device 120 is used to relay or forward the electromagnetic waves transmitted by the base station 110 .

[0055] Exemplarily, the relay reflector device 120 may be a RIS, an NCR, an intelligent relay device, or other devices with signal forwarding and relaying functions.

[0056] In some embodiments, as shown in FIG3 , the relay reflector device 120 includes a reflector module 121 and a control module 122. For example, when the relay reflector device 120 is a RIS, the reflector module 121 may be a signal relay module (RIS-Forwarding, RIS-Fwd) of the RIS; and the control module 122 may be a communication and control module (RIS-Mobile-Termination, RIS-MT) of the RIS.

[0057] Reflection module 121 is a reflective array composed of antenna elements, which is used to adjust the incident beam in different ways according to the codebooks of different antenna elements (the codebooks are used to control the spectrum, phase, amplitude, and polarization values ​​of each antenna element). This allows the outgoing beam to achieve different amplitudes, widths, frequency shifts, and exit angles, as well as single-beam reflection, multi-beam reflection, diffuse scattering, refraction, transmission, and other changes.

[0058] Exemplarily, the reflection module 121 may reflect the incoming beam to a specified area (e.g., a base station coverage blind spot) based on the beam indication (i.e., codebook) provided by the control module 122 to serve the UEs in the area. For example, in an embodiment of the present disclosure, the reflection module 121 may adjust the incoming beam from the base station 110 to an outgoing beam directed toward the terminal device 130.

[0059] The control module 122 includes a controller 122 - 1 , a memory 122 - 2 , and a communication interface 122 - 3 .

[0060] The controller 122 - 1 is configured to transmit a relay beam indication (ie, a codebook) to the reflection module 121 and control the working state of the reflection module 121 .

[0061] Exemplarily, the controller 122-1 can control the working state of the reflection module 121 according to the instructions of the base station 110, such as: switch state (controlling the working or non-working of the reflection module 121, etc.); power control (controlling the reflection beam amplitude of the reflection module 121); relay beam indication (code book of the antenna array of the reflection module 121).

[0062] It can be understood that a codebook represents a relative relationship between an incident beam and an outgoing beam. Therefore, for a reflective array, a codebook can also be called a beam indication.

[0063] The memory 122-2 is configured to store a codebook.

[0064] The communication interface 122 - 3 is used to exchange information with other devices. For example, the control module 122 can exchange information with the base station 110 through the communication interface 122 - 3 .

[0065] Exemplarily, the control module 122 may receive control information (e.g., codebook change information, etc.) sent by the base station 110 through the communication interface 122-3, and send RIS working status information, RIS configuration information, and RIS codebook set, etc. to the base station through the communication interface 122-3.

[0066] In some embodiments, the control module 122 may send sensor capability information and measurement results of the sensor module 123 to the base station 110 through the communication interface 122 - 3 .

[0067] Exemplarily, the communication interface 122 - 3 can interact with other devices through narrowband Internet of Things (NB-IoT), fifth-generation mobile communication technology (5G), wireless network transmission (wireless fidelity, WiFi), etc.

[0068] Optionally, the structures of the relay reflector device 120 may include the following:

[0069] (1) The reflection module 121 and the control module 122 are co-located.

[0070] (2) One control module 122 controls one reflection module 121, and the two are not co-located; the reflection module 121 and the control module 122 can be connected in a wired or wireless manner.

[0071] (3) One control module 122 controls multiple reflection modules 121, and the control module 122 and the reflection module 121 are not co-located; illustratively, one control module 122 can simultaneously control N reflection modules 121, and the control module 122 can receive control information of the N reflection modules 121 from the base station 110, and report status information of the N reflection modules 121 to the base station 110.

[0072] The structure of the relay reflector device 120 will be described below with reference to the drawings, taking the relay reflector device 120 as a RIS, the reflector module 121 as a RIS-Fwd, and the control module 122 as a RIS-MT as an example.

[0073] For example, as shown in FIG4 , RIS can be deployed on a high-speed rail carriage, and RIS-Fwd and RIS-MT are integrated into one, and the operating frequency band and beam of RIS-MT are a subset of RIS-Fwd.

[0074] For example, as shown in Figure 5, the RIS can be deployed on a high-speed rail carriage, with one RIS-MT and multiple RIS-Fwds deployed separately. In this configuration, the RIS-MT detects neighboring cell beams before the RIS-Fwd in the forward direction; in the reverse direction, the RIS-MT detects neighboring cell beams after the RIS-Fwd.

[0075] It should be noted that, in addition to being deployed on high-speed rail carriages, the above-mentioned structural form is also applicable to other types of mobile vehicles, such as subways and light rails, drones, vehicles on highways, ferries, etc., and the embodiments of the present disclosure do not limit this.

[0076] The terminal device 130 is configured to communicate based on the electromagnetic waves radiated by the relay reflection device 120 .

[0077] For example, the terminal device 130 may be a UE, such as a mobile phone, tablet computer, desktop computer, laptop computer, handheld computer, notebook computer, ultra-mobile personal computer (UMPC), netbook computer, cellular phone, personal digital assistant (PDA), augmented reality (AR) or virtual reality (VR) device, etc. The embodiments of the present disclosure do not impose any particular limitation on the form of the terminal device 130.

[0078] In the following, with reference to the accompanying drawings, the scenario involved in the communication system provided by the embodiment of the present disclosure is described by taking the relay reflector device 120 as a RIS as an example.

[0079] In some embodiments, Figure 6 illustrates a schematic diagram of an application scenario for a communication system provided by embodiments of the present disclosure. This scenario includes a RIS management entity, a base station, and a RIS deployed on a mobile vehicle. As can be seen, in this scenario, the RIS needs to perform handovers between base stations while moving.

[0080] The RIS management entity is used to manage the RIS codebook library, RIS deployment information, and RIS authentication. The RIS management entity can be deployed in: base stations, core network domains, core network elements, operation administration and maintenance (OAM), radio access network (RAN) access network domains, etc. Exemplarily, the core network elements can be: access and mobility management function (AMF), service management function (SMF), point coordination function (PCF), user port function (UPF), application function (AF), etc.

[0081] In some embodiments, the base station shown in Figure 1 may include one or more transmission reception points (TRPs) to increase the base station's coverage area. Figure 7 shows a schematic diagram of another application scenario for a communication system according to an embodiment of the present disclosure. This scenario includes a RIS management entity, a base station, a TRP, and a RIS deployed on a mobile vehicle. As can be seen, in this scenario, the RIS needs to switch between different TRPs within the same base station, as well as between different TRPs within different base stations, during movement.

[0082] In some embodiments, the architecture of the base station shown in Figure 1 can be a separate architecture with a centralized unit (CU) and a distributed unit (DU). As shown in Figure 8, a schematic diagram of an application scenario of another communication system provided by an embodiment of the present disclosure is provided. This scenario includes: a RIS management entity, a DU of a base station, a CU, and a RIS deployed on a mobile vehicle. It can be seen that in this scenario, the RIS needs to switch between base stations during movement, as well as switch between different CUs of the same base station.

[0083] It should be noted that the system architecture and application scenarios described in the embodiments of the present disclosure are intended to more clearly illustrate 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. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present disclosure are also applicable to similar technical problems.

[0084] The following is an introduction to a mobility management method provided by an embodiment of the present disclosure.

[0085] As shown in FIG9 , an embodiment of the present disclosure provides a mobility management method, which includes the following S201 - S202 .

[0086] S201: A first node determines a terminal device that is allowed to be switched to a third node.

[0087] The first node may be a source wireless network device in the handover process; the first node includes at least one of the following: a base station, a cell within a base station, a distributed wireless unit, or a wireless transceiver node.

[0088] The third node is a target wireless network device in the handover process; the third node includes at least one of the following: a base station, a cell within a base station, a distributed wireless unit, or a wireless transceiver node.

[0089] It should be noted that the above switching process can be a Handover process. In the Handover process, the wireless network device to be left is usually called the source wireless network device, for example, the source cell is called the source cell; the wireless network device to be entered is called the target wireless network device, for example, the target cell is called the target cell.

[0090] In some embodiments, the above S201 may be implemented as follows: the first node determines, from among the terminal devices connected to the first node via the second node, terminal devices that are allowed to switch to the third node.

[0091] The second node may be the relay reflector device 120 as shown in Figure 1. Exemplarily, the second node is a reconfigurable smart metasurface, a network-controllable relay device, or a smart relay device.

[0092] The terminal device accessing the first node through the second node refers to a terminal device establishing a wireless connection with the first node through a wireless signal relayed by a reflection module managed by the second node.

[0093] It can be understood that in a scenario where the second node is deployed on a mobile vehicle, the second node can adjust the incident beam from the first node to an outgoing beam toward the terminal device to improve the signal quality of the terminal device. In this way, the terminal device can establish a wireless connection with the first node through the wireless signal relayed by the second node.

[0094] In some embodiments, as shown in FIG10 , the above S201 may be implemented as the following S2011 - S2012 .

[0095] S2011. The first node sends a handover preparation request message to the third node.

[0096] In some embodiments, the handover preparation request message includes at least one of the following:

[0097] Switching reason;

[0098] a first list including an identifier of at least one terminal device to be switched to a third node;

[0099] Related information of the second node to be switched to the third node (the second node to be switched to the third node may be the second node corresponding to at least one terminal device to be switched to the third node);

[0100] The preset codebook table includes multiple codebooks and wireless network information or geographical area information corresponding to each of the multiple codebooks.

[0101] In some embodiments, the switching reason includes at least one of the following:

[0102] Terminal device group switching;

[0103] Group handover of a terminal device accessing the first node via the second node;

[0104] The second node changes the beam or changes the codebook, resulting in group handover of terminal devices accessing the first node through the second node.

[0105] The above-mentioned group switching refers to the switching of multiple terminal devices. The above-mentioned terminal device group switching refers to the multiple terminal devices within the coverage area of ​​the first node meeting the switching conditions. The above-mentioned group switching of terminal devices accessing the first node through the second node refers to the multiple terminal devices accessing the first node through the second node meeting the switching conditions.

[0106] In some embodiments, the relevant information of the second node to be switched to the third node includes at least one of the following:

[0107] The identifier of at least one reflector module included in the second node, and the number of at least one reflector module included in the second node. It is understandable that the second node may include multiple reflector modules, but not all terminal devices served by the reflector modules necessarily participate in the same handover process, and the handover process may also be completed in multiple handover processes. Therefore, the at least one reflector module may be all or part of the reflector modules included in the second node.

[0108] An identifier of a first reflection module; the first reflection module is a reflection module whose codebook is to be replaced in at least one reflection module included in the second node; it can be understood that the first reflection module is a reflection module in at least one reflection module whose codebook needs to be replaced in conjunction with the terminal device to be switched;

[0109] The recommended codebook to be replaced or the index of the recommended codebook to be replaced corresponding to the first reflection module; illustratively, the index of the codebook may be the serial number of the codebook;

[0110] Geographic information of at least one reflection module included in the second node; illustratively, the geographic information may be real-time location information;

[0111] Geographic information of the second node.

[0112] In some embodiments, the above-mentioned preset codebook table can be a set of codebooks preset based on the position information of the second node (or the position information of each reflection module included in the second node); or, the preset codebook table can be a set of codebooks preset based on the optimal beam information measured by the second node.

[0113] For example, the route of the vehicle's movement can be divided into different sections according to the geographical location, and an optimal codebook can be preset for each section; then, during the movement of the vehicle, the section where the target reflection module is located can be determined based on the position information of the target reflection module; and then, the target codebook corresponding to the target reflection module can be determined based on the section where the target reflection module is located.

[0114] Exemplarily, a codebook can be preset based on the optimal beam measured by the second node; further, during the movement of the vehicle, the target codebook corresponding to the target reflection module of the second node can be determined based on the change of the incident beam measured by the second node.

[0115] It is understandable that when the handover preparation request message carries a preset codebook table, the third node can determine the codebook that needs to be replaced for the reflection module of the second node from the preset codebook table based on the geographic information or wireless network information of the second node. In this way, compared to the method of determining the codebook by real-time detection of the second node's information (the actual measurement method may have interference and errors), determining the codebook from the preset codebook table can reduce measurement overhead and signaling overhead, reduce time delay, and improve the accuracy of codebook replacement.

[0116] S2012. The first node receives a handover preparation response message sent by the third node.

[0117] In some embodiments, the handover preparation response message includes at least one of the following:

[0118] a second list including an identifier of at least one terminal device allowed to be switched to the third node;

[0119] Allowing the terminal device that is switched to the third node to configure radio resources on the third node;

[0120] The identifier of the second node that is allowed to switch to the third node;

[0121] Related information of a second reflection module, where the second reflection module is a reflection module of a second node that agrees to change the codebook or beam;

[0122] A time offset for each terminal device in the second list to access the third node;

[0123] The signal quality threshold for each terminal device in the second list to access the third node.

[0124] The relevant information of the second reflection module includes at least one of the following:

[0125] an identifier of a second reflective module;

[0126] an identification of the new beam of the second reflection module;

[0127] an identifier of a new codebook of the second reflection module;

[0128] A second time offset, where the second time offset is a time offset for enabling a new codebook or a new beam by the second reflection module;

[0129] A first distance offset is a distance offset for enabling a new codebook or a new beam by the second reflection module.

[0130] In some embodiments, the above S201 may also be implemented as: when a preset condition for switching from the first node to the third node is met, determining a terminal device allowed to switch to the third node from among terminal devices connected to the first node through the second node.

[0131] The above-mentioned preconditions may include at least one of the following:

[0132] The signal quality of the first node measured by the terminal device is less than a first preset threshold;

[0133] The signal quality of the first node measured by the second node is less than a second preset threshold;

[0134] The signal quality of the third node measured by the second node exceeds a third preset threshold compared with the signal quality of the first node measured by the second node;

[0135] Determining that a target reflection module included in the second node meets a codebook replacement condition; illustratively, some implementations of the first node determining that the target reflection module included in the second node meets the codebook replacement condition can be referred to below b1-b3, which are not repeated here;

[0136] The first indication information is received, where the first indication information is used to indicate that the target reflection module meets the codebook replacement condition. Exemplarily, some implementations of the first node receiving the first indication information can be found in c1-c4 below, which are not repeated here.

[0137] Exemplarily, the signal quality of the first node can be obtained by measuring a reference signal of the first node. Exemplarily, the reference signal of the first node can be a synchronization signal and physical broadcast channel block (SSB) or a channel state information-reference signal (CSI-RS).

[0138] The above-mentioned signal quality may include at least one of the following: reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), signal to interference plus noise ratio (SINR), channel quality indication (CQI) and rank indicator (RI), etc.

[0139] At least one of the first preset threshold, the second preset threshold and the third preset threshold is pre-configured by the first node, the RIS management entity, the core network element or the third-party server.

[0140] In some embodiments, the codebook replacement condition includes at least one of the following:

[0141] The distance between the position of the target reflection module and the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to the second distance offset;

[0142] The time from the location of the target reflection module to arriving at or entering the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to the third time offset;

[0143] The signal quality of the neighboring cell of the first node is higher than the signal quality of the cell of the first node by a fourth preset threshold;

[0144] The signal quality of the neighboring cell of the first node is greater than or equal to a fifth preset threshold;

[0145] The signal quality of the cell of the first node is less than or equal to a sixth preset threshold.

[0146] At least one of the second distance offset, the third time offset, the fourth preset threshold, the fifth preset threshold, and the sixth preset threshold may be pre-configured by the first node, the RIS management entity, a core network element, or a third-party server.

[0147] It should be noted that in the above S2011-S2012, if there is no directly connected inter-station interface between the first node and the third node (exemplarily, taking 5G as an example, the inter-station interface of the base station is an Xn interface), the first node and the third node can transmit information through the interface with the core network mobility management function entity (exemplarily, taking the 5G core network as an example, the mobility management function entity is AMF). Exemplarily, taking the 5G core network as an example, the interface between the base station and the AMF is the N2 interface, and the first node and the third node can transmit information through the N2 interface.

[0148] In some other embodiments, if the first node and the third node are two DUs in the CU of the same base station, the above S201 can be implemented as the following a1-a3.

[0149] a1. The first node obtains a measurement report of the second node.

[0150] The measurement report includes measurement results of multiple measured cells, where the multiple measured cells include the cell of the first node and neighboring cells of the first node.

[0151] In some embodiments, the measurement results include at least one of the following:

[0152] The identification of the cell being measured;

[0153] Signal quality information of the measured cell;

[0154] The identification of the measured beam in the measured cell;

[0155] Signal quality information of the measured beam;

[0156] An incident angle of the measured beam relative to a reflection module included in the second node (or an incident angle of the measured beam).

[0157] For example, in the scenario shown in Figure 6, the identifier of the measured cell can be the identifier of the cell in the base station, or the identifier of the frequency point; in the scenario shown in Figure 7, the identifier of the measured cell can be the identifier of the measured TPR; in the scenario shown in Figure 8, the identifier of the measured cell can be the identifier of the measured DU.

[0158] Exemplarily, the signal quality information of the measured cell may include RSRP, RSRQ or SINR of the measured cell.

[0159] Exemplarily, the identifier of the measured beam of the measured cell may be an index of a downlink reference signal included in the measured beam, for example, an index of an SSB, a CSI-RS, or other downlink reference signal.

[0160] Exemplarily, the signal quality information of the measured beam may be the signal quality of a downlink reference signal included in the measured beam, for example, RSRP, RSRQ, or SINR of an SSB, CSI-RS, or other downlink reference signal.

[0161] Exemplarily, the incident angle of the measured beam relative to the reflection module included in the second node may also be an arrival angle or arrival direction of the measured beam relative to the reflection module included in the second node.

[0162] a2. The first node sends the measurement report of the second node to the CU.

[0163] a3. The CU determines, based on the measurement report, terminal devices that are connected to the first node through the second node and are allowed to switch to the third node.

[0164] In some embodiments, the CU may make an internal judgment based on the measurement report, and determine the terminal devices that are allowed to switch to the third node from the terminal devices that access the first node through the second node.

[0165] Exemplarily, internal judgment includes:

[0166] (1) The CU determines whether a terminal device connected to the first node through the second node can be switched to the third node; and which terminal devices connected to the first node through the second node can be switched to the third node.

[0167] (2) The CU determines whether the codebook of the reflection module included in the second node needs to be replaced; if the codebook needs to be replaced, the codebook to be replaced is determined.

[0168] It can be understood that in the scenario shown in FIG8 , the CU serves as a centralized processing unit, and in the switching process across DUs within the same CU, the CU needs to perform centralized processing and judgment.

[0169] S202: The first node sends a switching instruction to a terminal device that is allowed to switch to the third node.

[0170] The switching instruction is used to instruct switching from the first node to the third node.

[0171] In some embodiments, the switching instruction may include at least one of the following:

[0172] The third node provides a radio resource configuration for a terminal device that is allowed to be handed over to the third node;

[0173] Signal quality threshold for accessing the third node;

[0174] A first time offset for accessing the third node.

[0175] It can be understood that the wireless resource configuration provided by the third node for the terminal device allowed to switch to the third node is pre-configured by the third node and sent to the first node.

[0176] It can be understood that at least one of the above-mentioned signal quality threshold and the first time offset is pre-configured by the first node, the RIS management entity, the core network element or the third-party server.

[0177] In some embodiments, as shown in FIG11 , the above method may further include the following S203 .

[0178] S203: The terminal device switches from the first node to the third node according to the switching instruction.

[0179] In some embodiments, the above S203 may be implemented as follows: the terminal device immediately switches from the first node to the third node after receiving the switching instruction.

[0180] In some embodiments, when the switching instruction includes a first time offset, the above S203 can be implemented as follows: after receiving the switching instruction and after a time period corresponding to the first time offset has elapsed, the terminal device switches from the first node to the third node.

[0181] In some embodiments, when the switching instruction includes a signal quality threshold for accessing the third node, the above S203 can be implemented as follows: upon receiving the switching instruction and detecting that the signal quality of the third node meets the signal quality threshold, the terminal device switches from the first node to the third node.

[0182] In some embodiments, when the switching instruction includes a first time offset and a signal quality threshold for accessing the third node, the above S203 can be implemented as follows: after the terminal device receives the switching instruction and the time length corresponding to the first time offset has passed, if the signal quality of the third node meets the signal quality threshold, the terminal device switches from the first node to the third node.

[0183] In some embodiments, the above method further includes: if the terminal device fails to successfully switch to the third node within a preset time period after receiving the switching instruction, the terminal device initiates a switching failure process.

[0184] Exemplarily, the above-mentioned preset time length can be preset by the first node or the third node and sent to the terminal device. Within the preset time length after the terminal device receives the switching instruction, if the terminal device does not detect that the signal quality of the third node meets the preset threshold, the terminal device initiates the switching failure process.

[0185] In some embodiments, as shown in FIG12 , the above method further includes the following S204 - S205 .

[0186] S204: The first node sends second indication information to the second node. Correspondingly, the second node receives the second indication information sent by the first node.

[0187] The second indication information is used to instruct to replace the codebook of the target reflection module included in the second node with the target codebook.

[0188] In some embodiments, the second indication information includes at least one of the following:

[0189] target codebook or identification of the target codebook;

[0190] Identification of the target reflection module;

[0191] A fourth time offset, where the fourth time offset is a time offset for enabling the target codebook by the target reflection module;

[0192] A third distance offset, where the third distance offset is a distance offset for the target reflection module to enable the target codebook;

[0193] Codebook replacement conditions.

[0194] S205: The second node replaces the codebook of the target reflection module with the target codebook according to the second instruction information.

[0195] In some embodiments, the above S205 may be implemented as follows: the second node immediately replaces the codebook of the target reflection module with the target codebook after receiving the second indication information.

[0196] In some embodiments, when the second indication information includes a third distance offset, the above S205 can be implemented as follows: after receiving the second indication information, the second node replaces the codebook of the target reflection module with the target codebook when the distance between the position of the target reflection module and the geographical area corresponding to the target codebook reaches the third distance offset.

[0197] In some embodiments, when the second indication information includes a fourth time offset, the above S205 can be implemented as follows: after receiving the second indication information, the second node replaces the codebook of the target reflection module with the target codebook when the time when the target reflection module arrives at or enters the geographical area corresponding to the target codebook from its location reaches the fourth time offset.

[0198] In some embodiments, when the second indication information includes a codebook replacement condition, the above S205 can be implemented as follows: after receiving the second indication information, the second node replaces the codebook of the target reflection module with the target codebook if the target reflection module meets the codebook replacement condition.

[0199] It is understandable that, based on the method provided in the embodiments of the present disclosure, before the second node changes its codebook, multiple terminal devices covered by the second node are prepared for switching in advance and obtain the access configuration of the third node. Then, after the second node changes its codebook (at this time, the reflection module of the second node begins to relay the signal of the third node), the terminal device is connected to the third node again. In this way, in a scenario where the second node is deployed on a mobile vehicle, the success rate of cell switching for terminal devices in the vehicle can be improved.

[0200] In some embodiments, the first node determines that the target reflection module included in the second node meets the codebook replacement condition, which can be implemented as the following b1-b3.

[0201] b1. The first node receives a measurement report from the second node.

[0202] In some embodiments, the measurement report may further include position information of the target reflection module. Exemplarily, the position information of the target reflection module may be absolute position information (the absolute position information of the target reflection module is used to indicate the position of the target reflection module on the surface of the earth) or relative position information (the relative position information of the target reflection module may be the position of the target reflection module relative to a preset reference point), etc., which is not limited in the embodiments of the present disclosure.

[0203] In some embodiments, the measurement report may be sent by the second node (eg, a control module of the second node) to the first node; or, the measurement report may be sent by the terminal device to the first node.

[0204] Exemplarily, the control module of the second node may send a measurement report to the first node if it is determined that the measurement result meets the switching condition.

[0205] Exemplarily, the terminal device may determine whether the signal quality of the cell of the first node is lower than a preset threshold based on the above measurement results; and send a measurement report to the first node when the signal quality of the cell of the first node is lower than the preset threshold.

[0206] Exemplarily, the first node may send a measurement report acquisition request to the second node; and then, the second node sends a measurement report to the first node in response to the measurement report acquisition request.

[0207] b2. The first node determines whether the target reflection module meets the codebook replacement condition based on the measurement report.

[0208] In some embodiments, when the measurement report includes the location information of the target reflection module, it can be determined whether the target reflection module meets the codebook replacement condition by judging whether the distance between the location of the target reflection module and the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to the second distance offset; or by judging whether the time from the location of the target reflection module to arriving at or entering the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to the third time offset.

[0209] In some embodiments, when the measurement report includes wireless network information (for example, the measured cell identifier and the signal quality information of the measured cell, etc.), it can be determined whether the target reflection module meets the codebook replacement condition by judging whether the signal quality of the neighboring cell of the first node is higher than the signal quality of the cell of the first node by a fourth preset threshold; or, by judging whether the signal quality of the neighboring cell of the first node is greater than or equal to the fifth preset threshold; or, by judging whether the signal quality of the cell of the first node is less than or equal to the sixth preset threshold.

[0210] b3. When the target reflection module meets the codebook replacement condition, the first node determines the target codebook according to the measurement report.

[0211] In some embodiments, when a preset codebook table exists in the first node, the first node may determine the target codebook corresponding to the target reflection module from the preset codebook table according to the measurement report.

[0212] In some embodiments, if the first node does not have a preset codebook table, the first node may determine the target codebook in real time based on the measurement report. For example, the first node may select the codebook with the highest matching degree with the measurement report from the original codebook library based on the measurement report as the target codebook.

[0213] It is understandable that the first node can determine whether the target reflection module meets the codebook replacement condition based on the measurement report, and determine the target codebook if the target reflection module meets the codebook replacement condition. Furthermore, the second node can replace the codebook of the target reflection module with the target codebook after the terminal device covered by the target reflection module completes the switching preparation process. In this way, the target reflection module can relay the signal of the third node, causing the terminal device to switch to the third node.

[0214] In some embodiments, whether the target reflection module meets the codebook replacement condition may also be determined by the second node. Furthermore, if the second node determines that the target reflection module meets the codebook replacement condition, it may send first indication information to the first node. Exemplarily, this may be implemented as follows: c1-c4.

[0215] c1. The second node obtains a measurement report.

[0216] For example, the content of the measurement report can be found in b1 above, which will not be repeated here.

[0217] c2. The second node determines whether the target reflection module meets the codebook replacement condition based on the measurement report.

[0218] For example, the implementation of c2 can refer to the above b2 and will not be repeated here.

[0219] c3. When the target reflection module meets the codebook replacement condition, the second node determines the target codebook according to the measurement report.

[0220] For example, the implementation of c3 can refer to the above b3 and will not be repeated here.

[0221] c4. The second node sends first indication information to the first node and / or the third node.

[0222] The first indication information is used to indicate that the target reflection module meets the codebook replacement condition.

[0223] The target codebook is a new codebook of the target reflection module.

[0224] In some embodiments, the first indication information may include at least one of the following:

[0225] Identification of the target reflection module;

[0226] The identifier of the target codebook or the target codebook.

[0227] It can be understood that the second node can determine the target codebook corresponding to the target reflection module according to the measurement report when the target reflection module meets the codebook replacement condition, and send the first indication information to the first node or the third node. In this way, the first node can execute the switching process in response to the first indication information.

[0228] For ease of understanding, the mobility management method provided by the embodiment of the present disclosure is described below in the form of examples in combination with application scenarios.

[0229] It should be noted that, for the sake of convenience of description, the following is an example in which the first node is a source cell, the third node is a target cell, the second node is a RIS, the reflection module of the first node is RIS-Fwd, the control module of the first node is RIS-MT, and the terminal device is a UE.

[0230] Scenario 1: Cross-base station handover scenario

[0231] For example, as shown in Figure 13, a separate RIS (RIS-MT and multiple RIS-Fwds) is deployed on a high-speed train car. The car travels along a fixed route, moving from the coverage area of ​​BS2 to the coverage area of ​​BS1. During this process, when the RIS-Fwd is within the coverage area of ​​BS2, it reflects the beam of BS2 to cover the UEs in the car. When the RIS-Fwd is within the coverage area of ​​BS1, it reflects the beam of BS1 to cover the UEs in the car.

[0232] Exemplarily, the information of the beam can be expressed as: cell identifier, and beam identifier. The cell identifier can be expressed as including at least one of the following: global identification cell identifier (GCI), public land mobile network (PLMN) identifier (ID), cell identifier (cell ID), base station identifier, physical cell identifier (PCI). The beam identifier can be the index of the reference signal carried by the serving beam. For example, the reference signal includes at least one of the following: SSB, CSI-RS, tracking RS, demodulation reference signal (DMRS), positioning RS, and interference RS.

[0233] As shown in FIG13 , the beam information of BS2 can be expressed as: cell id 262, PCI 47, ssb 9; the beam information of BS1 can be expressed as: cell id 263, PCI 45, ssb18.

[0234] BS2 is the source cell, and "cell id 262, PCI 47, ssb 9" is the beam information of the source cell; BS1 is the target cell, and "cell id 263, PCI 45, ssb18" is the beam information of the target cell.

[0235] In the process shown in Figure 13, RIS-MT completes the handover from BS2 to BS1, RIS-Fwd implements the codebook replacement (from the codebook reflecting the beam of BS2 to the codebook reflecting the beam of BS1), and the UE in the car completes the handover from the source base station BS2 to the target base station BS1.

[0236] Exemplarily, the process can be implemented as the following d1-d8.

[0237] d1. BS2 receives the measurement report.

[0238] The measurement report may include: the cell signal measurement result of the source base station BS2 and the cell signal measurement result of the neighboring base station BS1.

[0239] In some embodiments, the measurement report may be a measurement report of wireless signals of BS2 and BS1 detected by a RIS-MT within the coverage of BS2. The measurement report may be sent by the RIS-MT within the coverage of BS2 to BS2.

[0240] Exemplarily, when it is determined that the cell signal measurement result of the source base station BS2 and the cell signal measurement result of the neighboring base station BS1 meet a preset Handover condition, the RIS-MT sends a measurement report to BS2.

[0241] Handover conditions may include at least one of the following:

[0242] The reference signal strength of the cell of the neighboring base station BS1 exceeds the reference signal strength of the cell of the source base station BS2 by a preset threshold B;

[0243] The reference signal strength of the cell of the neighboring base station BS1 is greater than or equal to the preset threshold C, and the reference signal strength of the cell of the source base station BS2 is less than the preset threshold D.

[0244] Exemplarily, when detecting that the RIS-Fwd1 managed by the RIS-MT meets the preset codebook replacement condition, the RIS-MT sends a measurement report to the BS2.

[0245] Illustratively, the preset codebook change condition may include: RIS-Fwd1 still has L-offset distance to enter the next road segment corresponding to the preset codebook (in the embodiment shown in FIG13 , RIS-Fwd1 will enter road segment N+1 from road segment N). L-offset is a preset distance offset, which is pre-configured by the base station and sent to the RIS-MT.

[0246] In some embodiments, the measurement report may be a measurement report of wireless signals of BS2 and BS1 detected by a UE within the coverage of BS2 (a UE covered by the beam reflected by RIS-MT from BS2). The measurement report may be sent by the UE within the coverage of BS2 to BS2.

[0247] For example, when UE1 within the coverage of RIS-MT detects that the RSRP of the beam of BS2 is lower than the preset threshold A (the preset threshold A can be configured in advance by the base station and sent to UE1, and the setting of this threshold is used to determine whether the signal quality covered by the source cell has weakened to a certain limit), it sends a measurement report to BS2.

[0248] In some embodiments, when BS2 determines that RIS-Fwd1 meets a preset RIS codebook replacement condition, BS2 sends a measurement report acquisition request to RIS-MT. Then, RIS-MT sends a measurement report to BS2 in response to the measurement report acquisition request.

[0249] Exemplarily, BS2 may measure whether RIS-Fwd1 meets the preset RIS codebook replacement condition in the following manner:

[0250] BS2 is wirelessly connected to RIS-MT and determines the location information of RIS-MT based on the positioning measurement function of the base station (for example, positioning based on the uplink signal sent by RIS-MT). BS2 then infers the location information of RIS-Fwd1 based on the relative position relationship between RIS-Fwd1 and RIS-MT (the relative position relationship between RIS-Fwd1 and RIS-MT can be obtained from the RIS management entity, the OAM management backend, the core network, or RIS-MT). BS2 then determines whether RIS-Fwd1 meets the preset RIS codebook replacement conditions based on the location information of RIS-Fwd1.

[0251] d2. BS2 determines, based on the measurement report, that the UE under RIS-MT coverage meets the handover condition.

[0252] d3. BS2 sends a Handover request to BS1.

[0253] Illustratively, the Handover request may include at least one of the following:

[0254] Handover cause;

[0255] List of UE IDs to be handovered (for example, the IDs of UE1 and UE2);

[0256] The ID of the RIS-MT to be handovered (for example, the ID of the RIS-MT may be the radio network temporary identity (RNTI) assigned to the RIS-MT by the base station, or the international mobile subscriber identification number (IMSI) of the RIS-MT, or other types of IDs);

[0257] RIS-MT ID corresponding to the UE list to be handovered;

[0258] The number of RIS-Fwds managed by RIS-MT and the RIS-Fwd IDs (for example, in the scenario shown in FIG13 , the number of RIS-Fwds is 2, and the RIS-Fwd IDs are 1 and 2 respectively);

[0259] The IDs of one or more RIS-Fwds corresponding to the list of UEs to be handovered (for example, the RIS-MT may manage multiple RIS-Fwds, but not all UEs covered by each RIS-Fwd will participate in the same handover process; it may also be completed in multiple handover processes);

[0260] Radio resource configuration of each UE in the UE list to be handovered in the source cell;

[0261] RIS-Fwd id list of the beam / codebook to be replaced (for example, in the scenario shown in FIG13 , it is the id of RIS-Fwd1);

[0262] The recommended codebook to be replaced or the index of the recommended codebook to be replaced;

[0263] The real-time geographic location of each RIS-Fwd beam / codebook to be replaced;

[0264] The movement route of the vehicle;

[0265] The preset codebook table includes multiple codebooks and wireless network information or geographical area information corresponding to each of the multiple codebooks.

[0266] It should be noted that if there is no direct inter-station interface (for example, Xn interface) between BS2 and BS1, BS2 can send a Handover request to BS1 through the interface between it and the core network mobility management function entity (for example, AMF) (for example, the interface between the base station and AMF can be the N2 interface).

[0267] d4. BS1 sends a Handover acknowledge message to BS2.

[0268] In some embodiments, when BS1 determines to accept the handover request of RIS-MT, UE1 and / or UE2, BS1 sends a Handover acknowledge message to BS2.

[0269] Illustratively, the Handover Acknowledge message may include at least one of the following:

[0270] List of UE IDs allowed to access the target cell;

[0271] The radio resource configuration of the target cell for each UE allowed to access the target cell;

[0272] The ID of the RIS-MT that is allowed to access the target cell;

[0273] The RIS-Fwd ID list of the second node that agrees to change the codebook or beam, confirmed by the target cell;

[0274] The identifier of the new beam or codebook corresponding to the RIS-Fwd of the second node that agrees to change the codebook or beam, as confirmed by the target cell;

[0275] Each RIS-Fwd changes the time offset or path offset of the beam or codebook.

[0276] The time offset instructs RIS-MT to wait a certain amount of time after receiving the Handover message before instructing RIS-Fwd1 to change the codebook. The time offset is determined based on the vehicle speed and the distance between RIS-Fwd1 and BS1's coverage area. This ensures that RIS-Fwd1 changes the codebook only after entering BS1's coverage area. This allows UE1 and UE2 to receive the stronger wireless signal from BS1.

[0277] Similarly, the purpose of setting the distance offset is the same as that of the time offset. After receiving the Handover message, RIS-MT measures its own position information in real time. When the distance offset is met, it controls RIS-Fwd1 to replace the new codebook.

[0278] It should be noted that if there is no direct inter-station interface (for example, Xn interface) between BS2 and BS1, BS1 can send a Handover acknowledge message to BS2 through the interface between it and the core network mobility management function entity (for example, AMF) (for example, the interface between the base station and AMF can be the N2 interface).

[0279] d5. BS2 sends a Handover command to the UE list allowed to access BS1.

[0280] Exemplarily, in the scenario shown in FIG13 , the list of UEs allowed to access BS1 includes: UE1 and UE2.

[0281] Illustratively, the Handover instruction includes at least one of the following:

[0282] The list of UE IDs allowed to access BS1 and the radio resource configuration of each UE in the target cell;

[0283] The time offset for each UE to access BS1 (i.e., after receiving the Handover command, the UE waits for a certain period of time before initiating access to BS1. This time offset should ensure that the UE's access behavior occurs after RIS-Fwd1 replaces the new codebook);

[0284] The signal quality threshold that the UE needs to meet to access BS1 (that is, the UE can access BS1 only after detecting that the signal quality of BS1 meets the signal quality threshold).

[0285] Exemplarily, the above-mentioned signal may be a downlink reference signal, such as SSB or CSI-RS, etc.; the above-mentioned signal quality threshold may be RSRP, RSRQ or SINR threshold, etc.

[0286] d6. BS2 sends a codebook change instruction to RIS-MT.

[0287] Exemplarily, the codebook replacement instruction may include at least one of the following:

[0288] RIS-Fwd id list of the codebook to be replaced (in the scenario shown in Figure 13, it is the id of RIS-Fwd1);

[0289] The codebook to be replaced or the identifier of the codebook to be replaced;

[0290] The RIS-Fwd of the codebook to be replaced enables the time offset or distance offset of the codebook.

[0291] In some embodiments, when a preset codebook table exists, the preset codebook for the next path segment corresponding to RIS-Fwd may be determined from the preset codebook table.

[0292] d7. UE1 and UE2 switch from BS2 to BS1 in response to the received Handover instruction.

[0293] For example, UE1 and UE2 may access BS1 immediately after receiving the Handover instruction.

[0294] For example, after receiving the Handover instruction, UE1 and UE2 may access BS1 after the indicated time offset.

[0295] For example, after receiving the Handover instruction, UE1 and UE2 may access BS1 after detecting that the signal quality (eg, RSRP, RSRQ, or SINR) of the downlink reference signal of BS1 reaches a preset threshold.

[0296] Illustratively, after receiving the Handover instruction, UE1 and UE2 may access BS1 after the indicated time offset and after measuring that the signal quality (eg, RSRP, RSRQ, or SINR) of the downlink reference signal of BS1 reaches a preset threshold.

[0297] In some embodiments, the method further includes: if the UE fails to successfully handover to the third node within a preset time period after receiving the handover instruction, the UE initiating a handover failure procedure. For example, BS2 or BS1 may set a predetermined time window for the UE. After receiving the handover instruction, if the UE fails to detect a BS1 signal that meets a preset threshold within the predetermined time window, the UE triggers the handover failure procedure.

[0298] d8. RIS-MT changes the codebook in response to the received codebook change instruction.

[0299] Exemplarily, the RIS-MT may change the codebook immediately after receiving the codebook change instruction.

[0300] Illustratively, after receiving the codebook change instruction, the RIS-MT may change the codebook after the distance between the RIS-MT and the geographical area corresponding to the codebook to be changed satisfies a preset distance offset.

[0301] Illustratively, after receiving the codebook change instruction, the RIS-MT may change the codebook after the time when the RIS-MT arrives at or enters the geographical area corresponding to the codebook to be changed from its location satisfies a preset time offset.

[0302] Exemplarily, the RIS-MT may change the codebook when receiving the codebook change instruction and determining that the RIS-MT meets the codebook change condition.

[0303] Scenario 2: Handover scenario across DUs within a CU of the same base station.

[0304] For example, as shown in Figure 14, the DUs of the two coverage areas that the high-speed train car passes through are both managed by the CU of the same base station BS, so this is an intra-site handover. BS1-DU1 is the source cell, and BS1-DU2 is the target cell.

[0305] For example, cross-DU Handover may include the following e1-e7.

[0306] e1 and BS1-DU1 receive the measurement report.

[0307] The measurement report may be sent by the RIS-MT; or, the measurement report may be sent by UE1 or UE2.

[0308] For example, the implementation of the above e1 can refer to the above d1, which will not be repeated here.

[0309] e2. BS1-DU1 forwards the measurement report to BS1-CU.

[0310] e3. BS1-CU makes internal judgment based on the measurement report.

[0311] Exemplarily, internal judgment includes:

[0312] (1) BS1-CU determines whether UE1 and UE2 can be handed over to BS1-DU2.

[0313] (2) BS1-CU determines whether the codebooks of RIS-Fwd1 and RIS-Fwd2 need to be replaced; if so, the codebooks to be replaced are determined.

[0314] e4. When BS1-CU determines that UE1 and UE2 can be handed over to BS1-DU2, it generates a Handover instruction and sends the Handover instruction to UE1 and UE2.

[0315] For example, the implementation of the above e4 can refer to the above d5, which will not be repeated here.

[0316] e5. When BS1-CU determines that the codebooks of RIS-Fwd1 and RIS-Fwd2 need to be replaced, it generates a codebook replacement instruction and sends the codebook replacement instruction to RIS-MT.

[0317] For example, the implementation of the above e5 can refer to the above d6, which will not be repeated here.

[0318] e6. RIS-MT controls RIS-Fwd1 and RIS-Fwd2 to change the codebook in response to the codebook change instruction.

[0319] For example, the implementation of the above e6 can refer to the above d7, which will not be repeated here.

[0320] e7. UE1 and UE2 respond to the Handover instruction and switch access to BS1-DU2.

[0321] For example, the implementation of the above e7 can refer to the above d8, which will not be repeated here.

[0322] It can be understood that in the scenario shown in FIG14 , the CU serves as a centralized processing unit, and in the Handover process across DUs within the same CU, the CU needs to perform centralized processing and judgment.

[0323] The above mainly introduces the solution of the embodiment of the present disclosure from the perspective of method. It can be understood that in order to realize the above functions, the management device includes at least one of the hardware structure and software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiment disclosed herein, the embodiment of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel 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 embodiment of the present disclosure.

[0324] The embodiment of the present disclosure can divide the functional modules of the management device according to the above-mentioned method embodiment. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one functional module. The above-mentioned integrated modules can be implemented in the form of hardware or software. It should be noted that the division of modules in the embodiment of the present disclosure is schematic and is only a logical functional division. There may be other division methods in actual implementation. The following is an example of dividing each functional module corresponding to each function.

[0325] Figure 15 is a schematic diagram of the structure of a management device provided in an embodiment of the present disclosure. The management device can be applied to the first node to execute the mobility management method provided in the above method embodiment. As shown in Figure 15, the management device 300 includes: a determination module 301 and a switching module 302. In other embodiments, the management device 300 may also include: a communication module 303.

[0326] The determination module 301 is configured to determine a terminal device that is allowed to be switched to a third node.

[0327] The switching module 302 is configured to send a switching instruction to the terminal device, where the switching instruction is used to instruct the terminal device to switch from the first node to the third node.

[0328] In some embodiments, the determination module 301 is configured to determine, from among terminal devices connected to the first node via the second node, terminal devices that are allowed to switch to the third node.

[0329] In some embodiments, the switching instruction includes at least one of the following: a wireless resource configuration provided by the third node for a terminal device that is allowed to switch to the third node; a signal quality threshold for accessing the third node; and a first time offset for accessing the third node.

[0330] In some embodiments, the determining module 301 is configured to send a handover preparation request message to a third node; and receive a handover preparation response message sent by the third node, where the handover preparation response message is generated based on the handover preparation request message.

[0331] In some embodiments, the switching preparation request message includes at least one of the following: a switching reason; a first list, the first list including an identifier of at least one terminal device to be switched to a third node; relevant information of a second node to be switched to the third node; a preset code book table, the preset code book table including multiple code books, and network area information corresponding to each of the multiple code books; a preset code book table, the preset code book table including multiple code books, and geographical area information corresponding to each of the multiple code books.

[0332] In some embodiments, when the switching preparation request message includes a switching reason, the switching reason includes at least one of the following: terminal device group switching; group switching of terminal devices accessing the first node through the second node; the second node changing the beam or changing the code book resulting in group switching of terminal devices accessing the first node through the second node.

[0333] In some embodiments, when the switching preparation request message includes relevant information of the second node, the relevant information of the second node includes at least one of the following: an identifier of at least one reflection module included in the second node; an identifier of the first reflection module; the first reflection module is a reflection module of the codebook to be replaced in at least one reflection module included in the second node; the recommended codebook to be replaced or the index of the recommended codebook to be replaced corresponding to the first reflection module; geographical information of at least one reflection module included in the second node; and geographical information of the second node.

[0334] In some embodiments, the switching preparation response message includes at least one of the following: a second list, the second list including the identifier of at least one terminal device allowed to switch to the third node; the wireless resource configuration of the terminal device allowed to switch to the third node at the third node; the identifier of the second node allowed to switch to the third node; relevant information of the second reflection module, the second reflection module is the reflection module of the second node that agrees to change the codebook or beam; the time offset for each terminal device in the second list to access the third node; the signal quality threshold for each terminal device in the second list to access the third node.

[0335] In some embodiments, when the switching preparation request message includes relevant information of the second reflection module, the relevant information of the second reflection module includes at least one of the following: an identifier of the second reflection module; an identifier of the new beam of the second reflection module; an identifier of the new codebook of the second reflection module; a second time offset, the second time offset is a time offset for the second reflection module to enable a new codebook or a new beam; a first distance offset, the first distance offset is a distance offset for the second reflection module to enable a new codebook or a new beam.

[0336] In some embodiments, the above-mentioned determination module 301 is used to determine the terminal device that is allowed to switch to the third node when a preset condition for switching from the first node to the third node is met.

[0337] In some embodiments, the above-mentioned preset conditions include at least one of the following: the signal quality of the first node measured by the terminal device is less than a first preset threshold; the signal quality of the first node measured by the second node is less than a second preset threshold; the signal quality of the third node measured by the second node exceeds the third preset threshold than the signal quality of the first node measured by the second node; it is determined that the target reflection module included in the second node meets the codebook replacement condition; first indication information is received, and the first indication information is used to indicate that the target reflection module meets the codebook replacement condition.

[0338] In some embodiments, the above-mentioned codebook replacement condition includes at least one of the following: the distance between the position of the target reflection module and the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to the second distance offset; the time from the position of the target reflection module to arriving at or entering the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to the third time offset; the signal quality of the neighboring area of ​​the first node is higher than the signal quality of the cell of the first node by a fourth preset threshold; the signal quality of the neighboring area of ​​the first node is greater than or equal to the fifth preset threshold; the signal quality of the cell of the first node is less than or equal to the sixth preset threshold.

[0339] In some embodiments, the communication module 303 is configured to send second indication information to the second node, where the second indication information is used to instruct to replace a codebook of a target reflection module included in the second node with a target codebook.

[0340] In some embodiments, the second indication information includes at least one of the following: a target codebook; an identifier of the target codebook; an identifier of a target reflection module; a fourth time offset, where the fourth time offset is a time offset for the target reflection module to enable the target codebook;

[0341] A third distance offset is a distance offset for enabling a target codebook by a target reflection module; and a codebook replacement condition.

[0342] In some embodiments, the communication module 303 is further used to receive a measurement report from the second node before sending the second indication information, where the measurement report includes measurement results of multiple measured cells, and the multiple measured cells include the cell of the first node and the neighboring cells of the first node; the determination module 301 is further used to determine whether the target reflection module meets the codebook replacement condition based on the measurement report.

[0343] In some embodiments, the measurement results of the above-mentioned measured cell include at least one of the following: the identification of the measured cell; the channel quality information of the measured cell; the identification of the measured beam in the measured cell; the channel quality information of the measured beam; the incident angle of the measured beam relative to the reflection module included in the second node.

[0344] In some embodiments, the determination module 301 is further configured to determine a target codebook according to the measurement report when the target reflection module meets the codebook replacement condition.

[0345] In some embodiments, the second node is a reconfigurable smart metasurface, a network-controllable relay device, or a smart relay device.

[0346] In some embodiments, a codebook is used to represent the correspondence between the input beam and the output beam.

[0347] In some embodiments, the first node is a source wireless network device in a handover process; the first node includes at least one of the following: a base station, a cell within a base station, a distributed wireless unit, or a wireless transceiver node.

[0348] In some embodiments, the third node is a target wireless network device in the handover process; the third node includes at least one of the following: a base station, a cell within a base station, a distributed wireless unit, or a wireless transceiver node.

[0349] Figure 16 is a schematic diagram of the structure of a management device provided in an embodiment of the present disclosure. The management device can be applied to the second node to execute the mobility management method provided in the above method embodiment. As shown in Figure 16, the management device 400 includes: a communication module 401 and a replacement module 402. In other embodiments, the management device 400 may also include: a determination module 403.

[0350] The communication module 401 is configured to receive second indication information sent by the first node; the second indication information is used to instruct to replace the codebook of the target reflection module included in the second node with the target codebook.

[0351] The replacing module 402 is configured to replace the codebook of the target reflection module with the target codebook according to the second indication information.

[0352] In some embodiments, the second indication information includes at least one of the following: a target codebook; an identifier of the target codebook; an identifier of a target reflection module; a fourth time offset, where the fourth time offset is a time offset for enabling the target codebook by the target reflection module; a third distance offset, where the third distance offset is a distance offset for enabling the target codebook by the target reflection module; and a codebook replacement condition.

[0353] In some embodiments, the replacement module 402 is configured to replace the codebook of the target reflection module with the target codebook immediately after receiving the second indication information.

[0354] In some embodiments, when the second indication information includes a third distance offset, the replacement module 402 is configured to, after receiving the second indication information, replace the codebook of the target reflection module with the target codebook when the distance between the position of the target reflection module and the geographical area corresponding to the target codebook reaches the third distance offset.

[0355] In some embodiments, when the second indication information includes a fourth time offset, the replacement module 402 is configured to, after receiving the second indication information, replace the codebook of the target reflection module with the target codebook when the time when the target reflection module arrives at or enters the geographical area corresponding to the target codebook from its location reaches the fourth time offset.

[0356] In some embodiments, when the second indication information includes the codebook replacement condition, the replacement module 402 is configured to, after receiving the second indication information, replace the codebook of the target reflection module with the target codebook if the target reflection module meets the codebook replacement condition.

[0357] In some embodiments, the communication module 401 is further used to obtain a measurement report, where the measurement report includes measurement results of multiple measured cells, where the multiple measured cells include the cell of the first node and the neighboring cells of the first node; the determination module 403 is used to determine whether the target reflection module meets the codebook replacement condition based on the measurement report.

[0358] In some embodiments, the communication module 401 is further configured to send first indication information to the first node and / or the third node when the target reflection module meets the codebook replacement condition, where the first indication information is used to indicate that the target reflection module meets the codebook replacement condition.

[0359] In some embodiments, the determination module 403 is further configured to determine a target codebook according to the measurement report when the target reflection module meets the codebook replacement condition, where the target codebook is a new codebook of the target reflection module.

[0360] FIG17 is a schematic diagram of a management device according to an embodiment of the present disclosure, which can be applied to the terminal device to execute the mobility management method according to the embodiment of the present disclosure. As shown in FIG17 , the management device 500 includes a receiving module 501 and a switching module 502 .

[0361] The receiving module 501 is configured to receive a switching instruction, where the switching instruction is used to instruct switching from a first node to a third node.

[0362] The switching module 502 is configured to switch from the first node to the third node according to the switching instruction.

[0363] In some embodiments, the switching module 502 is configured to switch from the first node to the third node immediately after receiving a switching instruction.

[0364] In some embodiments, the switching module 502 is configured to switch from the first node to the third node after receiving a switching instruction and after a time duration corresponding to the first time offset has elapsed.

[0365] In some embodiments, the switching module 502 is configured to, after receiving a switching instruction and after a time period corresponding to the first time offset has elapsed, switch from the first node to the third node if the signal quality of the third node meets a signal quality threshold.

[0366] In some embodiments, the switching module 502 is configured to initiate a switching failure process if the switching to the third node is not successful within a preset time period after receiving the switching instruction.

[0367] In the case of implementing the functions of the above-mentioned integrated modules in the form of hardware, the embodiments of the present disclosure provide another possible structure of the communication device involved in the above-mentioned embodiments. As shown in Figure 18, the communication device 600 includes: a memory 601, a processor 602, a communication interface 603, and a bus 604.

[0368] The memory 601 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store dynamic information and instructions, an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0369] The processor 602 may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of the present disclosure. The processor 602 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array, or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The processor 602 may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of the present disclosure. The processor 602 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0370] The communication interface 603 is used to connect to other devices via a communication network, such as Ethernet, wireless access network, or wireless local area network (WLAN).

[0371] In some embodiments, the memory 601 may exist independently of the processor 602. The memory 601 may be connected to the processor 602 via a bus 604 and used to store instructions or program codes. When the processor 602 calls and executes the instructions or program codes stored in the memory 601, the mobility management method provided in the embodiments of the present disclosure can be implemented.

[0372] In some embodiments, the memory 601 may also be integrated with the processor 602 .

[0373] Bus 604 can be an Extended Industry Standard Architecture (EISA) bus, etc. Bus 604 can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, FIG18 shows only one thick line, but this does not mean that there is only one bus or only one type of bus.

[0374] Some embodiments of the present disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium), which stores computer program instructions. When the computer program instructions are executed on a computer, the computer executes the mobility management method as described in any of the above embodiments.

[0375] For example, the computer-readable storage media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.). The various computer-readable storage media described in the present disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0376] An embodiment of the present disclosure provides a computer program product comprising instructions. When the computer program product is run on a computer, the computer is enabled to execute the mobility management method described in any one of the above embodiments.

[0377] The above is only a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or replacements within the technical scope disclosed in the present disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A mobility management method, applied to a first node, wherein: The method comprises: determining a terminal device that is allowed to switch to a third node; A switching instruction is sent to the terminal device, where the switching instruction is used to instruct the terminal device to switch from the first node to the third node.

2. The method according to claim 1, wherein: Determine the terminal devices that are allowed to switch to the third node, including: From the terminal devices accessing the first node through the second node, a terminal device allowed to switch to the third node is determined.

3. The method according to claim 1, wherein: The switching instruction includes at least one of the following: The third node provides a wireless resource configuration for the terminal device that is allowed to switch to the third node; A signal quality threshold for accessing the third node; A first time offset of accessing the third node.

4. The method according to claim 1, wherein: Determine the terminal devices that are allowed to switch to the third node, including: Sending a switching preparation request message to the third node; A handover preparation response message sent by the third node is received, where the handover preparation response message is generated based on the handover preparation request message.

5. The method according to claim 4, wherein: The handover preparation request message includes at least one of the following: Switching reason; A first list, wherein the first list includes an identification of at least one terminal device to be switched to the third node; Relevant information of the second node to be switched to the third node; A preset codebook table, wherein the preset codebook table includes a plurality of codebooks and network area information corresponding to each of the plurality of codebooks; A preset codebook table includes a plurality of codebooks and geographical area information corresponding to each of the plurality of codebooks.

6. The method according to claim 5, wherein: In the case where the handover preparation request message includes the handover cause, the handover cause includes at least one of the following: Terminal device group switching; Group switching of a terminal device accessing the first node through the second node; The second node changes the beam or changes the codebook, resulting in group switching of terminal devices accessing the first node through the second node.

7. The method according to claim 5, wherein: In a case where the handover preparation request message includes relevant information of the second node, the relevant information of the second node includes at least one of the following: an identifier of at least one reflection module included in the second node; An identifier of a first reflection module; the first reflection module is a reflection module of the codebook to be replaced in at least one reflection module included in the second node; The recommended codebook to be replaced or the index of the recommended codebook to be replaced corresponding to the first reflection module; Geographic information of at least one reflection module included in the second node; The geographical information of the second node.

8. The method according to claim 4, wherein: The handover preparation response message includes at least one of the following: a second list, wherein the second list includes an identification of at least one terminal device that is allowed to switch to the third node; The wireless resource configuration of the terminal device allowed to switch to the third node at the third node; an identifier of the second node that is allowed to switch to the third node; Related information of a second reflection module, where the second reflection module is a reflection module of the second node that agrees to change the codebook or beam; A time offset for each terminal device in the second list to access the third node; The signal quality threshold for each terminal device in the second list to access the third node.

9. The method according to claim 8, wherein: In a case where the handover preparation request message includes relevant information of the second reflection module, the relevant information of the second reflection module includes at least one of the following: an identifier of the second reflection module; an identifier of a new beam of the second reflection module; an identifier of a new codebook of the second reflection module; A second time offset, where the second time offset is a time offset for the second reflection module to enable the new codebook or the new beam; A first distance offset, where the first distance offset is a distance offset for the second reflection module to enable the new codebook or the new beam.

10. The method according to claim 4, wherein: Determine the terminal devices that are allowed to switch to the third node, including: When a preset condition for switching from the first node to the third node is met, a terminal device that is allowed to switch to the third node is determined.

11. The method according to claim 10, wherein: The preset condition includes at least one of the following: The signal quality of the first node measured by the terminal device is less than a first preset threshold; The signal quality of the first node measured by the second node is less than a second preset threshold; The signal quality of the third node measured by the second node exceeds a third preset threshold compared with the signal quality of the first node measured by the second node; Determining that a target reflection module included in the second node meets a codebook replacement condition; First indication information is received, where the first indication information is used to indicate that the target reflection module meets a codebook replacement condition.

12. The method according to claim 11, wherein: The codebook replacement condition includes at least one of the following: The distance between the position of the target reflection module and the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to the second distance offset; The time from the location of the target reflection module to arriving at or entering the geographical area corresponding to the target codebook in the preset codebook table is less than or equal to a third time offset; The signal quality of the neighboring cell of the first node is higher than the signal quality of the cell of the first node by a fourth preset threshold; The signal quality of the neighboring cell of the first node is greater than or equal to a fifth preset threshold; The signal quality of the cell of the first node is less than or equal to a sixth preset threshold.

13. The method according to claim 2, further comprising: Sending second indication information to the second node, where the second indication information is used to instruct to replace a codebook of a target reflection module included in the second node with a target codebook.

14. The method according to claim 13, wherein: The second indication information includes at least one of the following: the target codebook; an identifier of the target codebook; The identification of the target reflection module; a fourth time offset, wherein the fourth time offset is a time offset for the target reflection module to enable the target codebook; A third distance offset, wherein the third distance offset is a distance offset for the target reflection module to enable the target codebook; Codebook replacement conditions.

15. The method according to claim 13, further comprising: Before sending the second indication information, receiving a measurement report of the second node, where the measurement report includes measurement results of multiple measured cells, where the multiple measured cells include a cell of the first node and a neighboring cell of the first node; Determine, according to the measurement report, whether the target reflection module meets a codebook replacement condition.

16. The method according to claim 15, wherein: The measurement result of the measured cell includes at least one of the following: The identification of the measured cell; Channel quality information of the measured cell; An identifier of a measured beam in the measured cell; Channel quality information of the measured beam; The incident angle of the measured beam relative to the reflection module included in the second node.

17. The method according to claim 15, further comprising: When the target reflection module meets the codebook replacement condition, the target codebook is determined according to the measurement report.

18. The method according to claim 2, wherein: The second node is a reconfigurable intelligent metasurface, a network-controllable relay device or an intelligent relay device.

19. The method according to any one of claims 5 to 8, wherein: The codebook is used to represent the corresponding relationship between the incident beam and the outgoing beam.

20. The method according to claim 1, wherein: The first node is a source wireless network device in the switching process; the first node includes at least one of the following: a base station, a cell within a base station, a distributed wireless unit, and a wireless transceiver node.

21. The method according to claim 1, wherein: The third node is a target wireless network device in the switching process; the third node includes at least one of the following: a base station, a cell within a base station, a distributed wireless unit, and a wireless transceiver node.

22. A mobility management method, applied to a second node, wherein: The method comprises: receiving second indication information sent by the first node; the second indication information is used to indicate that a codebook of a target reflection module included in the second node is replaced with a target codebook; According to the second indication information, a codebook of the target reflection module is replaced with the target codebook.

23. The method according to claim 22, wherein: The second indication information includes at least one of the following: the target codebook; an identifier of the target codebook; The identification of the target reflection module; a fourth time offset, wherein the fourth time offset is a time offset for the target reflection module to enable the target codebook; A third distance offset, wherein the third distance offset is a distance offset for the target reflection module to enable the target codebook; Codebook replacement conditions.

24. The method according to claim 23, wherein: Replacing the codebook of the target reflection module with the target codebook according to the second indication information includes: After receiving the second indication information, the codebook of the target reflection module is immediately replaced with the target codebook.

25. The method according to claim 23, wherein: In a case where the second indication information includes the third distance offset, replacing the codebook of the target reflection module with the target codebook according to the second indication information includes: After receiving the second indication information, when the distance between the position of the target reflection module and the geographical area corresponding to the target codebook reaches a third distance offset, the codebook of the target reflection module is replaced with the target codebook.

26. The method of claim 23, wherein: In a case where the second indication information includes the fourth time offset, replacing the codebook of the target reflection module with the target codebook according to the second indication information includes: After receiving the second indication information, when the time when the target reflection module arrives at or enters the geographical area corresponding to the target codebook from its location reaches a fourth time offset, the codebook of the target reflection module is replaced with the target codebook.

27. The method according to claim 23, wherein: In a case where the second indication information includes the codebook replacement condition, replacing the codebook of the target reflection module with the target codebook according to the second indication information includes: After receiving the second indication information, if the target reflection module meets a codebook replacement condition, the codebook of the target reflection module is replaced with the target codebook.

28. The method of claim 22, further comprising: Obtaining a measurement report, where the measurement report includes measurement results of multiple measured cells, where the multiple measured cells include a cell of the first node and a neighboring cell of the first node; Determine, according to the measurement report, whether the target reflection module meets a codebook replacement condition.

29. The method according to claim 28, further comprising: In a case where the target reflection module meets a codebook replacement condition, first indication information is sent to the first node and / or the third node, where the first indication information is used to indicate that the target reflection module meets the codebook replacement condition.

30. The method of claim 28, further comprising: When the target reflection module meets the codebook replacement condition, a target codebook is determined according to the measurement report, and the target codebook is a new codebook of the target reflection module.

31. A communication device, comprising: A memory and a processor; wherein the memory and the processor are coupled; the memory is used to store instructions executable by the processor; when the processor executes the instructions, it performs the method according to any one of claims 1 to 21, or any one of claims 22 to 30.

32. A computer-readable storage medium, wherein: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method according to any one of claims 1 to 21, or any one of claims 22 to 30.

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