EP-4738926-A1 - MOBILITY MANAGEMENT METHOD, COMMUNICATION APPARATUS, AND STORAGE MEDIUM

EP4738926A1EP 4738926 A1EP4738926 A1EP 4738926A1EP-4738926-A1

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.

Inventors

DAI, QIAN
LI, PING
CUI, Yijun

Assignees

ZTE Corporation

Dates

Publication Date: 20260506
Application Date: 20240611

Claims (20)

A mobility management method, characterized by being applied to a first node, wherein the method comprises: determining a terminal device that is allowed to perform handover to a third node; and sending a handover instruction to the terminal device, wherein the handover instruction is used to indicate the terminal device to perform handover from the first node to the third node.
The method according to claim 1, wherein determining the terminal device that is allowed to perform handover to the third node comprises: determining the terminal device that is allowed to perform handover to the third node from terminal devices accessing to the first node via a second node.
The method according to claim 1, wherein the handover instruction comprises at least one of: a wireless resource configuration provided by the third node for the terminal device that is allowed to perform handover to the third node; a signal quality threshold for accessing to the third node; a first time offset for accessing to the third node.
The method according to claim 1, wherein determining the terminal device that is allowed to perform handover to the third node comprises: sending a handover preparation request message to the third node; and receiving a handover preparation response message sent from the third node, wherein the handover preparation response message is generated based on the handover preparation request message.
The method according to claim 4, wherein the handover preparation request message comprises at least one of: a handover reason; a first list, wherein the first list comprises at least one identifier of at least one terminal device preparing to perform handover to the third node; relevant information of a second node preparing to perform handover to the third node; a preset codebook table, wherein the preset codebook table comprises a plurality of codebooks, and network area information respectively corresponding to the plurality of codebooks; or a preset codebook table, wherein the preset codebook table comprises a plurality of codebooks, and geographic area information respectively corresponding to the plurality of codebooks.
The method according to claim 5, wherein in response to that the handover preparation request message includes the handover reason, the handover reason comprises at least one of: terminal device group handover; group handover of terminal devices accessing to the first node via the second node; or group handover of terminal devices accessing to the first node via the second node caused by the second node changing a beam or changing a codebook.
The method according to claim 5, wherein in response to that the handover preparation request message comprises the relevant information of the second node, the relevant information of the second node comprises at least one of: at least one identifier of at least one reflection module included in the second node; an identifier of a first reflection module, wherein the first reflection module is a reflection module for which a codebook is to be changed among the at least one reflection module included in the second node; a recommended codebook to be changed or an index of the recommended codebook to be changed corresponding to the first reflection module; geographic information of the at least one reflection module included in the second node; or geographic information of the second node.
The method according to claim 4, wherein the handover preparation response message comprises at least one of: a second list, wherein the second list comprises at least one identifier of at least one terminal device that is allowed to perform handover to the third node; a wireless resource configuration of the terminal device that is allowed to perform handover to the third node in the third node; an identifier of a second node that is allowed to perform handover to the third node; relevant information of a second reflection module, wherein the second reflection module is a reflection module that agrees to change a codebook or a beam of the second node; time offsets for respective terminal devices in the second list to access to the third node; or signal quality thresholds for respective terminal devices in the second list to access to the third node.
The method according to claim 8, wherein in response to that the handover preparation request message comprises the relevant information of the second reflection module, the relevant information of the second reflection module comprises at least one of: an identifier of the second reflection module; an identifier of a new beam for the second reflection module; an identifier of a new codebook for the second reflection module; a second time offset, wherein the second time offset is a time offset for the second reflection module enabling the new codebook or the new beam; or a first distance offset, wherein the first distance offset is a distance offset for the second reflection module enabling the new codebook or the new beam.
The method according to claim 4, wherein determining the terminal device that is allowed to perform handover to the third node comprises: in response to that a preset condition for performing handover from the first node to the third node is met, determining the terminal device that is allowed to perform handover to the third node.
The method according to claim 10, wherein the preset condition comprises at least one of: a signal quality for the first node measured by the terminal device being lower than a first preset threshold; a signal quality for the first node measured by the second node being lower than a second preset threshold; a difference between a signal quality for the third node measured by the second node and a signal quality for the first node measured by the second node exceeding a third preset threshold; determining that a target reflection module included in the second node meets a codebook changing condition; receiving first indication information, wherein the first indication information is used to indicate that the target reflection module meets the codebook changing condition.
The method according to claim 11, wherein the codebook changing condition comprises at least one of: a distance between a position of the target reflection module and a geographic area corresponding to a target codebook in a preset codebook table being shorter than or equal to a second distance offset; a time required for the target reflection module from the position of the target reflection module to reach or enter the geographic area corresponding to the target codebook in the preset codebook table being shorter than or equal to a third time offset; a signal quality of a neighboring cell of the first node being higher than a signal quality of a cell of the first node by a fourth preset threshold; the signal quality of the neighboring cell of the first node being greater than or equal to a fifth preset threshold; or the signal quality of the cell of the first node being lower than or equal to a sixth preset threshold.
The method according to claim 2, further comprising: sending second indication information to the second node, wherein the second indication information is used to indicate to change a codebook for a target reflection module included in the second node to a target codebook.
The method according to claim 13, wherein the second indication information comprises at least one of: the target codebook; an identifier of the target codebook; an identifier of the target reflection module; a fourth time offset, wherein the fourth time offset is a time offset for the target reflection module enabling the target codebook; a third distance offset, wherein the third distance offset is a distance offset for the target reflection module enabling the target codebook; or a codebook changing condition.
The method according to claim 13, further comprising: receiving a measurement report of the second node before sending the second indication information, wherein the measurement report comprises measurement results of a plurality of measured cells, and the plurality of measured cells comprise a cell of the first node and a neighboring cell of the first node; and determining whether the target reflection module meets a codebook changing condition according to the measurement report.
The method according to claim 15, wherein a measurement result of a measured cell comprises at least one of: an identifier 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; or an incident angle of the measured beam with respect to a reflection module included in the second node.
The method according to claim 15, further comprising: in response to that the target reflection module meets the codebook changing condition, determining the target codebook according to the measurement report.
The method according to claim 2, wherein the second node is a reconfigurable intelligent surface, a network controllable relay device, or an intelligent relay device.
The method according to any one of claims 5 to 8, wherein a codebook is used to represent a correspondence between an incident beam and an outgoing beam.
The method according to claim 1, wherein the first node is a source wireless network device in a handover process; the first node comprises at least one of: a base station, an intra-site cell of the base station, a distributed wireless unit, or a wireless transceiver node.

Description

The present disclosure claims priority to Chinese Patent Application No. 202310787422.7, filed on June 29, 2023, which is hereby incorporated by reference in its entirety. TECHNICAL FIELD The present disclosure relates to the technical field of communications, and in particular, to mobility management method, a communication apparatus, and a storage medium. BACKGROUND A reconfigurable intelligent surface (RIS) is an artificial electromagnetic material with programmable electromagnetic properties, which includes a large number of low-cost reflection arrays. By controlling a phase and an amplitude of each array, a direction of an outgoing beam for focusing may be adjusted, thereby changing a propagation path of electromagnetic waves and implementing control over the wireless network environment. The deployment manner for RIS is usually to deploy one or more dedicated RISs within a coverage area of a single base station, so as to improve signals of coverage blind spots within the coverage area of the base station. In certain special scenarios, RIS may be deployed on a mobile vehicle, so as to provide signal relay and coverage for a user inside the vehicle. For example, in a high-speed train, it is necessary to deploy a transmissive RIS on the windows to reflect beams from a base station into the space inside the carriage. SUMMARY In one aspect, a mobility management method is provided, which is applied to a first node. The mobility management method includes: determining a terminal device that is allowed to perform handover to a third node; and sending a handover instruction to the terminal device, where the handover instruction is used to indicate the terminal device to perform handover from the first node to the third node. In another aspect, a mobility management method is provided, which is applied to a second node. The mobility management method includes: receiving second indication information sent from a first node; where the second indication information is used to indicate to change a codebook for a target reflection module included in the second node to a target codebook; and changing the codebook for the target reflection module to the target codebook according to the second indication information. In yet another aspect, a management apparatus is provided, which is applied to a first node. The management apparatus includes: a determination module, configured to determine a terminal device that is allowed to perform handover to a third node from terminal devices accessing to the first node via a second node; and a handover module, configured to send a handover instruction to the terminal device that is allowed to perform handover to the third node, where the handover instruction is used to indicate to perform handover from the first node to the third node. In yet another aspect, a management apparatus is provided, which is applied to a second node. The management apparatus includes: a receiving module, configured to receive second indication information sent from a first node; where the second indication information is used to indicate to change a codebook for a target reflection module included in the second node to a target codebook; and a change module, configured to change the codebook for the target reflection module to the target codebook according to the second indication information. In yet another aspect, a communication apparatus is provided. The communication apparatus includes: a memory and a processor, where the memory and the processor are coupled; the memory is configured to store computer programs; and the processor, upon executing the computer programs, implements the mobility management method according to any of the above-mentioned aspects. In yet another aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer program instructions, where the computer program instructions, upon being executed by a processor, enable the processor to implement the mobility management method according to any of the above-mentioned aspects. In yet another aspect, a computer program product is provided. The computer program product includes computer program instructions, where the computer program instructions, upon being executed by a processor, enable the processor to implement the mobility management method according to any of the above-mentioned aspects. BRIEF DESCRIPTION OF THE DRAWINGS In order to illustrate the technical solutions in the present disclosure more clearly, accompanying drawings needed to be used in some embodiments of the present disclosure will be introduced briefly below. Obviously, the described accompanying drawings below are merely accompanying drawings of some embodiments of the present disclosure, and for a person of ordinary skill in the art can obtain other accompanying drawings according to these accompanying drawings. FIG. 1 is a schematic diagram of an architecture of a communication system according to some embodiments