Information transmission method and apparatus, and storage medium

Abstract

The present disclosure provides an information transmission method and apparatus, and a storage medium. The method comprises: recording first information of a first cell, wherein the first cell is a cell on which a terminal camps, and the first information comprises layer 1 / layer 2-triggered mobility (LTM) information of the first cell. In the present disclosure, a terminal can record LTM information of a camped cell, and provide the LTM information to a network device during the movement of the terminal, thereby optimizing mobility management configuration, improving the reliability of mobility decisions, facilitating the reduction of ping-pong handover, and achieving high availability.

Description

Information transmission method and device, and storage medium Technical Field

[0001] The present disclosure relates to the field of communications, and in particular to an information transmission method and device, and a storage medium. Background Art

[0002] Currently, New Radio (NR) supports multiple types of Layer 3 (L3)-based mobility configurations, including but not limited to handover, conditional handover, etc.

[0003] Summary of the Invention

[0004] In order to optimize mobility management configuration, embodiments of the present disclosure provide an information transmission method and apparatus, and a storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided an information transmission method, which is executed by a terminal and includes:

[0006] Record first information of the first cell; wherein the first cell is a cell where the terminal resides, and the first information includes mobility LTM information triggered by layer 1 and layer 2 of the first cell.

[0007] According to a second aspect of an embodiment of the present disclosure, there is provided an information transmission method, which is performed by a first network device and includes:

[0008] First information sent by a terminal is received, where the first information includes mobility LTM information triggered by layers 1 and 2 of a first cell, where the first cell is a cell where the terminal resides.

[0009] According to a third aspect of an embodiment of the present disclosure, there is provided an information transmission method, which is performed by a second network device and includes:

[0010] Second indication information is sent to the first network device, where the second indication information is used to indicate a second duration for the terminal to reside in the second cell.

[0011] According to a fourth aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0012] The processing module is configured to record first information of a first cell; wherein the first cell is a cell where the terminal resides, and the first information includes mobility LTM information triggered by layer 1 and layer 2 of the first cell.

[0013] According to a fifth aspect of an embodiment of the present disclosure, there is provided a first network device, including:

[0014] The transceiver module is configured to receive first information sent by the terminal, where the first information includes mobility LTM information triggered by layers 1 and 2 of a first cell, where the first cell is a cell where the terminal resides.

[0015] According to a sixth aspect of an embodiment of the present disclosure, a second network device is provided, including:

[0016] The transceiver module is configured to send second indication information to the first network device, where the second indication information is used to indicate a second duration for the terminal to reside in the second cell.

[0017] According to a seventh aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0018] one or more processors;

[0019] The processor is used to execute any one of the information transmission methods of the first aspect.

[0020] According to an eighth aspect of an embodiment of the present disclosure, there is provided a first network device, including:

[0021] one or more processors;

[0022] The processor is used to execute any one of the information transmission methods of the second aspect.

[0023] According to a ninth aspect of an embodiment of the present disclosure, a second network device is provided, including:

[0024] one or more processors;

[0025] The processor is used to execute any one of the information transmission methods of the third aspect.

[0026] According to a tenth aspect of an embodiment of the present disclosure, there is provided a communication system, including:

[0027] A terminal, the terminal being configured to implement any one of the information transmission methods of the first aspect;

[0028] a first network device, the first network device being configured to implement the information transmission method according to any one of the second aspects;

[0029] The second network device is configured to implement any information transmission method of the third aspect.

[0030] According to an eleventh aspect of an embodiment of the present disclosure, a storage medium is provided, which stores instructions. When the instructions are executed on a communication device, the communication device executes an information transmission method as described in any one of the first, second or third aspects.

[0031] In the disclosed embodiment, the terminal can record the LTM information of the resident cell and provide it to the network device during mobility, thereby optimizing the mobility management configuration, improving the reliability of mobility decisions, helping to reduce ping-pong handovers, and improving availability.

[0032] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0034] FIG1A is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0035] FIG1B is an exemplary schematic diagram of an EN-DC architecture provided according to an embodiment of the present disclosure.

[0036] FIG1C is an exemplary schematic diagram of an NR-DC architecture provided according to an embodiment of the present disclosure.

[0037] FIG1D is an exemplary schematic diagram of a dual-connection architecture provided according to an embodiment of the present disclosure.

[0038] FIG1E is an exemplary interactive diagram of a switching process provided according to an embodiment of the present disclosure.

[0039] FIG1F is an exemplary interactive diagram of an LTM cell handover process provided according to an embodiment of the present disclosure.

[0040] FIG2A is an exemplary interaction diagram of an information transmission method provided according to an embodiment of the present disclosure.

[0041] FIG2B is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0042] FIG2C is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0043] FIG2D is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0044] FIG3A is an exemplary interaction diagram of an information transmission method provided according to an embodiment of the present disclosure.

[0045] FIG3B is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0046] FIG3C is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0047] FIG4A is a schematic diagram of an exemplary interaction of a terminal provided according to an embodiment of the present disclosure.

[0048] FIG4B is a schematic diagram of an exemplary interaction of a first network device according to an embodiment of the present disclosure.

[0049] FIG4C is a schematic diagram of an exemplary interaction of a first network device according to an embodiment of the present disclosure.

[0050] FIG5A is a schematic diagram of an exemplary interaction of a communication device according to an embodiment of the present disclosure.

[0051] FIG5B is an exemplary interaction diagram of a chip provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0053] The embodiments of the present disclosure provide an information transmission method, an information transmission device, and a storage medium.

[0054] In a first aspect, an embodiment of the present disclosure provides an information transmission method, which is executed by a terminal and includes:

[0055] Record first information of the first cell; wherein the first cell is a cell where the terminal resides, and the first information includes mobility LTM information triggered by layer 1 and layer 2 of the first cell.

[0056] In the above embodiment, the terminal can record the LTM information of the resident cell to assist the network device in configuring and optimizing mobility management, thereby improving the reliability of mobility decisions, helping to reduce ping-pong handovers, and achieving high availability.

[0057] In conjunction with some embodiments of the first aspect, in some embodiments, recording the first information of the first cell includes:

[0058] If a first condition is met, first information of the first cell is recorded;

[0059] The first condition includes at least one of the following:

[0060] The resident cell of the terminal changes, and the first cell is the cell where the terminal resides after the resident cell changes;

[0061] The first cell belongs to the LTM candidate cell;

[0062] The terminal is configured with LTM configuration in the first cell;

[0063] The terminal performs LTM cell handover.

[0064] In the above embodiment, the terminal may record the first information of the first cell when the first condition is met. The first condition may include but is not limited to at least one of the above. The behavior of the terminal recording the first information is clarified, which has high usability.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments, the first information includes at least one of the following:

[0066] Whether the first cell is an LTM candidate cell;

[0067] Whether the terminal is configured with LTM configuration in the first cell;

[0068] Whether the change of the resident cell is an LTM cell handover;

[0069] The first duration that the terminal stays in the first cell.

[0070] In the above embodiment, the first information may include but is not limited to at least one of the above items, which clarifies the specific content of the first information recorded by the terminal and helps to assist the network device in performing mobility management configuration.

[0071] In conjunction with some embodiments of the first aspect, in some embodiments, recording the first information of the first cell includes:

[0072] The first information of the first cell is recorded in a first reporting variable.

[0073] In the above embodiment, the terminal may record the first information of the first cell into the first report variable so as to provide it to the network device during movement, thereby achieving the purpose of recording the first information of the first cell and having high availability.

[0074] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0075] A first report is sent to the first network device, where the first report includes first information.

[0076] In the above embodiment, the terminal may send a first report to the first network device. The first report may include the first information, thereby providing the first information to the network device during mobility, helping to reduce ping-pong switching and improving availability.

[0077] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes at least one of the following:

[0078] The first storage space for storing the first information is full, and the second information contained in the first storage space is deleted based on a predefined method;

[0079] The first storage space for storing the first information is full, and based on the first indication information sent by the first network device, the second information contained in the first storage space is deleted.

[0080] In the above embodiment, when the terminal records the first information of the first cell and the first storage space is full, the information therein can be effectively deleted, thereby avoiding the problem that the latest first information cannot be recorded or stored in time due to the first storage space being full, and the availability is high.

[0081] In conjunction with some embodiments of the first aspect, in some embodiments, the second information contained in the first storage space satisfies at least one of the following:

[0082] The earliest storage is in the first storage space;

[0083] Contains first information of at least one cell.

[0084] In the above embodiment, the second information deleted by the terminal may be the first information stored earliest in the first storage space and / or including at least one cell, so the first storage space can be cleared in time, and the availability is high.

[0085] In conjunction with some embodiments of the first aspect, in some embodiments, the first cell includes at least one of the following:

[0086] Primary cell PCell;

[0087] Primary and secondary cells PSCell.

[0088] In the above embodiment, the first cell may be a special cell, including but not limited to at least one of a PCell and a Pscell. The mobility management configuration is optimized, the reliability of mobility decision is improved, ping-pong handover is reduced, and availability is high.

[0089] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0090] The terminal capability information is sent to the first network device, where the terminal capability information is used to indicate whether the terminal has the capability to store and / or send the first information of the first cell.

[0091] In the above embodiment, the terminal can send terminal capability information to the first network device, informing the network device whether the terminal has the ability to store and / or send the first information of the first cell, so that the network device can obtain the first information provided by the terminal, thereby improving the reliability of obtaining the first information.

[0092] In a second aspect, an embodiment of the present disclosure provides an information transmission method, which is performed by a first network device and includes:

[0093] First information sent by a terminal is received, where the first information includes mobility LTM information triggered by layers 1 and 2 of a first cell, where the first cell is a cell where the terminal resides.

[0094] In the above embodiment, the first network device can obtain first information from the terminal, where the first information includes mobility LTM information triggered by layers 1 and 2 of a first cell, where the first cell is the cell where the terminal resides. This allows the first information to be used to optimize mobility management configuration, improve the reliability of mobility decisions, reduce ping-pong handovers, and improve availability.

[0095] In conjunction with some embodiments of the second aspect, in some embodiments, the first information includes at least one of the following:

[0096] Whether the first cell is an LTM candidate cell;

[0097] Whether the terminal is configured with LTM configuration in the first cell;

[0098] Whether the change of the resident cell is an LTM cell handover;

[0099] The first duration that the terminal stays in the first cell.

[0100] In conjunction with some embodiments of the second aspect, in some embodiments, receiving the first information sent by the terminal includes:

[0101] A first report sent by a terminal is received, where the first report includes first information.

[0102] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes at least one of the following:

[0103] The second storage space for storing the first information is full, and based on a predefined method, the third information contained in the second storage space is deleted;

[0104] The second storage space for storing the first information is full, and the terminal history information UHI of the terminal is available, and the UHI of the terminal is discarded.

[0105] In the above embodiment, the first network device can delete the third information contained in the second storage space based on a predefined method when the second storage space is full, and / or discard the UHI from the terminal, thereby ensuring that the second storage space can be cleaned up in a timely manner and the UHI from the terminal can be discarded, with high availability.

[0106] In conjunction with some embodiments of the second aspect, in some embodiments, the third information contained in the second storage space satisfies at least one of the following:

[0107] The earliest one is stored in the second storage space;

[0108] Contains first information of at least one cell.

[0109] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0110] First indication information is sent to the terminal, where the first indication information is used to indicate that when the first storage space is full, the second information contained in the first storage space is deleted; wherein the first storage space is a space on the terminal for storing the first information.

[0111] In conjunction with some embodiments of the second aspect, in some embodiments, the second information contained in the first storage space satisfies at least one of the following:

[0112] The earliest storage is in the first storage space;

[0113] Contains first information of at least one cell.

[0114] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0115] receiving second indication information sent by the second network device, where the second indication information is used to indicate a second duration for which the terminal stays in the second cell;

[0116] Based on the second indication information, the total duration of the terminal's stay in the second cell is updated.

[0117] In the above embodiment, the first network device may update the total residence time of the terminal in the second cell based on the second indication information sent by the second network device, thereby ensuring the reliability of the residence time of the terminal in the historical cell recorded by the network side.

[0118] In conjunction with some embodiments of the second aspect, in some embodiments, updating the total duration of the terminal's stay in the second cell based on the second indication information includes:

[0119] Determine a third duration, where the third duration is a duration from a first time point to a second time point, the first time point being a time point when a handover request message sent by the second network device is received, and the second time point being a time point when a radio resource control RRC reconfiguration complete message sent by the terminal is received;

[0120] The total duration during which the terminal resides in the second cell is updated based on the sum of the second duration and the third duration.

[0121] In the above embodiment, the first network device can determine the sum of the second residence time of the terminal in the second cell provided by the second network device and the third residence time of the terminal performing cell switching as the total residence time of the terminal in the historical cell, thereby improving the reliability of the residence time of the terminal in the historical cell during the LTM cell switching process.

[0122] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0123] Sending third indication information to the second network device, where the third indication information is used by the second network device to determine whether there is an LTM switching optimization problem; wherein the third indication information includes the first information.

[0124] In the above embodiment, the first network device can send the third indication information to the second network device so that the second network device can determine whether there is an LTM switching optimization problem based on the first information, thereby performing LTM switching optimization in a timely manner, improving the reliability of mobility decisions, helping to reduce ping-pong switching, and having high availability.

[0125] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0126] Determining an existing LTM switching optimization problem based on the first information;

[0127] Fourth indication information is sent to the second network device, where the fourth indication information is used to indicate an existing LTM switching optimization problem.

[0128] In the above embodiment, the first network device can provide the LTM handover optimization problem determined by the first network device to the second network device so that the second network device can perform LTM handover optimization in a timely manner, thereby improving the reliability of mobility decisions, helping to reduce ping-pong handovers, and having high availability.

[0129] In conjunction with some embodiments of the second aspect, in some embodiments, the first cell includes at least one of the following:

[0130] Primary cell PCell;

[0131] Primary and secondary cells PSCell.

[0132] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0133] Terminal capability information sent by the terminal is received, where the terminal capability information is used to indicate whether the terminal has the capability of storing and / or sending the first information of the first cell.

[0134] In a third aspect, an embodiment of the present disclosure provides an information transmission method, which is performed by a second network device and includes:

[0135] Second indication information is sent to the first network device, where the second indication information is used to indicate a second duration for the terminal to reside in the second cell.

[0136] In the above embodiment, the second network device may send the second indication information to the first network device so that the first network device updates the residence time of the terminal in the historical cell, which is simple to implement and has high availability.

[0137] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0138] receiving third indication information sent by the first network device; the third indication information includes first information of the first cell; wherein the first cell is a cell where the terminal resides, and the first information includes mobility LTM information triggered by layer 1 and layer 2 of the first cell;

[0139] Based on the third indication information, it is determined whether there is an LTM switching optimization problem.

[0140] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0141] Fourth indication information sent by the first network device is received, where the fourth indication information is used to indicate an existing LTM switching optimization problem.

[0142] In a fourth aspect, an embodiment of the present disclosure provides a terminal, including:

[0143] The processing module is configured to record first information of a first cell; wherein the first cell is a cell where the terminal resides, and the first information includes mobility LTM information triggered by layer 1 and layer 2 of the first cell.

[0144] In a fifth aspect, an embodiment of the present disclosure provides a first network device, including:

[0145] The transceiver module is configured to receive first information sent by the terminal, where the first information includes mobility LTM information triggered by layers 1 and 2 of a first cell, where the first cell is a cell where the terminal resides.

[0146] In a sixth aspect, an embodiment of the present disclosure provides a second network device, including:

[0147] The transceiver module is configured to send second indication information to the first network device, where the second indication information is used to indicate a second duration for the terminal to reside in the second cell.

[0148] In a seventh aspect, an embodiment of the present disclosure provides a terminal, including:

[0149] one or more processors;

[0150] The processor is used to execute any one of the information transmission methods of the first aspect.

[0151] In an eighth aspect, an embodiment of the present disclosure provides a first network device, including:

[0152] one or more processors;

[0153] The processor is used to execute any one of the information transmission methods of the second aspect.

[0154] In a ninth aspect, an embodiment of the present disclosure provides a second network device, including:

[0155] one or more processors;

[0156] The processor is used to execute any one of the information transmission methods of the third aspect.

[0157] In a tenth aspect, an embodiment of the present disclosure provides a communication system, including:

[0158] A terminal, the terminal being configured to implement any one of the information transmission methods of the first aspect;

[0159] a first network device, the first network device being configured to implement the information transmission method according to any one of the second aspects;

[0160] The second network device is configured to implement any information transmission method of the third aspect.

[0161] In the eleventh aspect, an embodiment of the present disclosure proposes a storage medium storing instructions, which, when executed on a communication device, enables the communication device to execute an information transmission method as described in any one of the first, second, or third aspects.

[0162] It is understandable that the above-mentioned terminals, network devices, communication systems, storage media, and computer programs are all used to execute the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods and will not be repeated here.

[0163] The present disclosure provides an information transmission method, apparatus, and storage medium. In some embodiments, the terms "information transmission method," "information processing method," and "communication method" are interchangeable; the terms "information transmission apparatus," "information processing apparatus," and "communication apparatus" are interchangeable; and the terms "information processing system," "communication system," and "communication system" are interchangeable.

[0164] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0165] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0166] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0167] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when articles such as "a", "an", "the" in English are used in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0168] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0169] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0170] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0171] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0172] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0173] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0174] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "entity", "subject", etc.

[0175] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0176] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)", etc.

[0177] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0178] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0179] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0180] FIG1A is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0181] As shown in FIG. 1A , a communication system 100 includes a terminal 101 , a first network device 102 , and a second network device 103 .

[0182] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0183] In some embodiments, the first network device 102 may include but is not limited to an access network device and a core network device.

[0184] In some embodiments, the second network device 103 may include but is not limited to an access network device and a core network device.

[0185] In some embodiments, the above-mentioned access network device is, for example, a node or device that accesses the terminal to the wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0186] In some embodiments, the above-mentioned access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, and the functions of some protocol layers are centrally controlled by the CU, while the functions of the remaining part or all of the protocol layers are distributed in the DU, and the DU is centrally controlled by the CU, but is not limited to this.

[0187] In some embodiments, the core network device may be a single device including one or more network elements, or may be multiple devices or a group of devices. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), or a Next Generation Core (NGC).

[0188] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0189] In some embodiments, the terminal 101 is connected to the core network device through the access network device.

[0190] In some embodiments, when the resident cell of the terminal 101 changes, the second network device 103 can be the source access network device (and source core network device) accessed by the terminal 101, and the first network device 102 can be the target access network device (and target core network device) accessed by the terminal 101.

[0191] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment 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 solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0192] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1A , or a portion thereof, but are not limited thereto. The entities shown in FIG1A are illustrative only. The communication system may include all or part of the entities shown in FIG1A , or may include other entities other than those shown in FIG1A . The number and form of the entities may be arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0193] The embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G New Radio (NR), 6th generation mobile communication system (6G), Future Radio Access (FRA), New Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, systems utilizing other communication methods, and next-generation systems based on these. Furthermore, a combination of multiple systems (for example, a combination of LTE or LTE-A with 5G) may also be used.

[0194] Before introducing the solutions provided by the present disclosure, the terminology and technical scenarios involved in the present disclosure are first introduced.

[0195] 1. Multi-Rate Dual Connectivity (MR-DC).

[0196] 1-1, MR-DC.

[0197] MR-DC is a generalized Intra-Evolved Universal Terrestrial Radio Access (Intra-E-UTRA) dual connectivity in which a terminal can utilize radio resources provided by two different schedulers located on two different Next Generation Radio Access Network (NG-RAN) nodes, connected via a non-ideal backhaul: one providing NR access and the other providing E-UTRA or NR access. One acts as a Master Node (MN) and the other as a Secondary Node (SN). The MN and SN are connected via a network interface, with at least one MN connected to the core network.

[0198] 1-2. MR-DC with Enhanced Packet Core (EPC)

[0199] E-UTRAN supports MR-DC through E-UTRA-NR DC (EN-DC), where a terminal connects to an eNB acting as a mobile node (MN) and an en-gNB acting as a network (SN). The eNB connects to the EPC via the S1 interface and to the en-gNB via the X2 interface. The en-gNB can also connect to the EPC via the S1-U interface and to other en-gNBs via the X2-U interface. An example of the EN-DC architecture is shown in Figure 1B.

[0200] 1-3. MR-DC of the 5G core network (MR-DC with 5GC). It includes the following categories:

[0201] A)NGEN-DC (E-UTRA-NR Dual Connectivity).

[0202] NG-RAN supports NG-RAN E-UTRA-NR dual connectivity, where the terminal is connected to an ng-eNB as a mobile node and a gNB as a network node. The ng-eNB is connected to the 5GC, and the gNB is connected to the ng-eNB via the Xn interface.

[0203] B)NE-DC (NR-E-UTRA Dual Connectivity).

[0204] NG-RAN supports NR-E-UTRA DC (NE-DC), where the terminal is connected to a gNB acting as a mobile node and an ng-eNB acting as a network node. The gNB is connected to the 5GC, and the ng-eNB is connected to the gNB via the Xn interface.

[0205] C)NR-NR Dual Connectivity.

[0206] NG-RAN supports NR-NR DC (NR-DC), in which a UE connects to a gNB acting as a mobile node and another gNB acting as a network node. The primary gNB connects to the 5GC via the NG interface, and the two gNBs are connected via the Xn interface. The secondary gNB can also connect to the 5GC via the NG-U interface. NR-DC can also be used for UEs to access a single gNB acting as both a mobile node and a network node, with both a mobile group and a network group configured. The NR-DC architecture is shown in Figure 1C.

[0207] Under dual connectivity, as shown in Figure 1D, the terminal can access two cell groups, namely the Main Cell Group (MCG) and the Secondary Cell group (SCG). Under MCG, there may be many cells, one of which is used to initiate initial access, and this cell is called the Primary Cell (PCell). As the name suggests, PCell is the most "main" cell in MCG. The PCell under MCG and the Secondary Cell (SCell) under MCG are combined through carrier aggregation (CA). The main cell in MCG is PCell, and the secondary cell is SCell. The main and secondary cells in SCG are PSCell (Primary Secondary Cell), and the secondary cell is SCell. Because many signalings are only sent on PCell and PSCell, for the convenience of description, a concept of special cell (sPCell) is also defined, where PCell and PSCell are collectively referred to as sPCell.

[0208] 2. Layer 3 Mobility

[0209] Currently, NR supports a variety of L3 mobility configurations, including handover and conditional handover.

[0210] A. Switch.

[0211] Requires clear RRC signal triggering. For inter-gNB handover, the signaling procedure consists of at least the following basic components, as shown in Figure 1E, including the following steps:

[0212] Step 1: The source base station (gNB) initiates a handover and sends a handover request via the Xn interface.

[0213] Step 2: The target gNB performs admission control and provides a new Radio Resource Control (RRC) configuration as part of the handover request confirmation.

[0214] Step 3: The source gNB provides the RRC configuration to the terminal by forwarding the RRCReconfiguration message received in the Handover Request Answer.

[0215] The RRCReconfiguration message includes at least the cell identity and all information required to access the target cell so that the terminal can access the target cell without reading system information. In some cases, the information required for contention-based and non-contention-based random access can be included in the RRCReconfiguration message. The access information of the target cell can include beam-specific information (if any).

[0216] Step 4. The terminal moves the RRC connection to the target gNB and responds with an RRCReconfigurationComplete message.

[0217] B. Conditional Handover (CHO).

[0218] Conditional handover refers to a handover performed by the UE when one or more handover execution conditions are met. The UE begins evaluating the execution conditions after receiving the CHO configuration and stops evaluating the execution conditions after performing the handover (including legacy handover and CHO).

[0219] The following guidelines apply to conditional switching:

[0220] Criterion 1: CHO configuration includes CHO candidate cell configuration and execution conditions.

[0221] Rule 2: An execution condition may contain one or two trigger conditions (CHO events A3 / A5).

[0222] CHO event A3: The conditional reconfiguration candidate has a better offset than PCell / PCell.

[0223] CHO event A5: PCell / PCell becomes worse than an absolute threshold 1 and the conditional reconfiguration candidate becomes better than another absolute threshold 2.

[0224] Rule 3: Before any CHO execution conditions are met, if the terminal receives a handover (without CHO configuration) command, it executes the legacy handover (legacy HO) process regardless of any CHO configuration received previously.

[0225] Rule 4: When performing CHO, that is, from the time the terminal starts synchronizing with the target cell, the terminal does not monitor the source cell.

[0226] 3. Compared with L3 mobility, the present disclosure also proposes Layer 1 / Layer 2-triggered mobility (LTM).

[0227] In the 5G system, the network device can provide multiple "candidate cells (or cell groups)" to the terminal. The network device can subsequently control the terminal to change multiple "candidate cells (or cell groups)" (for example, changing the working cell (or cell group) from "candidate cell (or cell group) #1" to "candidate cell (or cell group) #2") through L1 (such as downlink control information (DCI)) or L2 (medium access control element (MAC CE)) signaling. Among them, one serving cell (or cell group) can correspond to one or more "candidate cells (or cell groups)".

[0228] The LTM cell handover process is shown in FIG1F and includes the following stages:

[0229] Phase 1: LTM preparation phase.

[0230] During this phase, the terminal can send a measurement report to the network device, which then prepares LTM candidates and provides the LTM candidate cell configuration to the terminal via an RRC reconfiguration message. The terminal then returns an RRC reconfiguration completion message to the network device.

[0231] The second stage is the early synchronization stage.

[0232] The terminal performs downlink synchronization and uplink synchronization with the candidate cell.

[0233] The third stage is the LTM cell switching execution stage.

[0234] The terminal sends an L1 measurement report to the network device. The network device makes an LTM decision and returns a cell handover command via MAC CE. The terminal deletes the previous configuration and applies the target configuration. It then initiates random access to the target network device.

[0235] The fourth stage is the LTM cell switching completion stage.

[0236] The terminal and the target network device complete the LTM cell handover.

[0237] Currently, DU is supported to activate candidate cells (or cell groups) through MAC CE.

[0238] In addition, LTM supports the following scenarios:

[0239] Release 18 (Rel-18) L1 / L2 mobility includes non-CA (PCell only) and CA scenarios (PCell and SCell). This includes the following cases:

[0240] a) The target PCell / target SCell is not the current serving cell (CA scenario with PCell change).

[0241] b) The target PCell is the current SCell.

[0242] c) The target SCell is the current PCell.

[0243] L1L2-based mobility supports the following CA scenarios:

[0244] a) PCell changes without SCell changes.

[0245] b) PCell changes with SCell.

[0246] c) Support NR-DC scenarios in L1L2 based mobility, at least for PSCell changes without MN participation, i.e. intra-SN.

[0247] Next, we will introduce the inter-RAT ping-pong effect.

[0248] 4. Inter-RAT ping-pong.

[0249] In 5G NR, the ping-pong effect typically refers to a terminal frequently switching between two different RATs. This situation typically occurs at the edge of two RAT coverage areas, such as between 5G and 4G LTE networks. If a terminal experiences rapid changes in signal strength at the edge of these two networks, it may frequently switch between the two networks. This ping-pong switching can have adverse effects on both network equipment and the terminal.

[0250] On the one hand, to perform inter-RAT handovers, network equipment must configure a large measurement gap for the terminal. During this measurement gap, the terminal cannot send data, resulting in reduced user service quality. On the other hand, network equipment must frequently send signaling messages to enable the terminal to perform inter-RAT handovers, which significantly wastes wireless access system resources.

[0251] One of the functions of Mobility Robust Optimization (MRO) is to detect the inter-system ping-pong problem, which is defined as follows:

[0252] The terminal switches from a cell in the source system (e.g., 5GS) to a cell in a target system different from the source system (e.g., EPS), and then switches back to a cell in the source system within a predefined limited time, provided that the coverage of the source system is sufficient to satisfy the service being used by the terminal. This event may occur more than once.

[0253] A solution to the ping-pong effect might include the following steps:

[0254] First, inter-system ping-pong event statistics are collected by the responsible node.

[0255] This can be based on evaluating the UE History Information (UHI) in the HANDOVER REQUIRED message. If the evaluation result indicates that there is a potential ping-pong event, and the source NG-RAN node of the first inter-system handover is different from the target NG-RAN node of the second inter-system handover, the target NG-RAN node can use a HANDOVER REPORT message or an UPLINK RAN CONFIGURATION TRANSFER message to indicate the presence of a potential ping-pong event to the source NG-RAN node.

[0256] Secondly, coverage verification is performed to check whether migration to other systems is inevitable. The coverage of NG-RAN during pingpong can be verified based on unnecessary handovers to other systems.

[0257] A) Unnecessary handover means that when a terminal switches from a first RAT to a second RAT, and within a period of time thereafter, the terminal detects that the signal quality of the first RAT still meets the service requirements of the current user, then the handover from the first RAT to the second RAT is considered an unnecessary handover (premature inter-system HO without connection failure).

[0258] B) This may be caused by setting the serving cell threshold for triggering handover in the source system too high. If the serving cell threshold (NR cell) is set too high and a cell with good signal strength is available in the other system (i.e., EPS), handover to the other system may be triggered unnecessarily, resulting in inefficient network utilization. Using a lower threshold allows the UE to continue operating in the source system (5GS).

[0259] C) To detect unnecessary HOs to another system, the gNB node may optionally include additional coverage and quality condition information during the handover preparation process when an inter-system HO occurs from a gNB to another system. Upon receiving this additional coverage and quality information, the RAN node in the other system can instruct the UE to continue measuring cells in the source system for a period of time while connected to the other system and send measurement reports to the node in the other system. Upon expiration of the time specified by the source system node, the RAN node in the other system can evaluate the received measurement reports based on the coverage / quality conditions received during the inter-system HO process and decide whether to send unnecessary inter-system HO reports to the gNB in ​​the source system.

[0260] D) The target RAT shall send a HO report to the source RAT only if any cell in the source system exceeds the radio coverage and / or quality thresholds (radio thresholds Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), and / or Signal to Interference plus Noise Ratio (SINR) and the measurement period specified in the Additional Coverage and Quality Information during the Handover Preparation procedure) in all terminal measurement reports collected during the measurement period. If an inter-system handover from EPS to 5GS is performed within the specified measurement period, the measurement period expires. In this case, the eNB in ​​EPS may send a HO report. If no NR cell can be included, or if the specified time period is interrupted by an inter-system handover to a system other than 5GS, a HO report shall not be sent.

[0261] E) After receiving the report, the RAN node in the source system (5GS) can decide whether / how to adjust its parameters (e.g., adjust the threshold that triggers inter-system HO).

[0262] Of course, the ping-pong effect can also occur between two base stations within a RAT (intra-RAT). However, the ping-pong effect in the inter-RAT scenario is of greater concern for the following reasons:

[0263] Reason 1: Inter-RAT handover costs are higher: Inter-RAT handover (e.g., from LTE to NR or vice versa) is generally more complex than handover within the same RAT (e.g., LTE to LTE), requiring more signaling and potentially resulting in longer service interruptions.

[0264] Reason 2: Inter-RAT collaboration: Networks between different RATs may be managed by different network operators, or even by the same operator, their deployment and optimization strategies may differ. This can lead to inconsistent network performance at the edge, increasing the risk of ping-pong effects.

[0265] Reason 3: Impact on user experience: Inter-RAT handover may have a greater negative impact on user experience because it may involve different network performance characteristics (e.g., speed, latency, etc.) and changes in quality of service (QoS).

[0266] Reason 4: Resource utilization efficiency: Frequent inter-RAT handovers may lead to inefficient utilization of radio resources, because each handover requires allocation of new radio resources and may waste already allocated resources during the handover process.

[0267] Therefore, to optimize network performance and user experience, we are currently focusing on the ping-pong effect in cross-RAT scenarios and taking measures to monitor and reduce its occurrence. This may include improving handover algorithms, adjusting network coverage and capacity planning, and using more intelligent terminal handover decision logic.

[0268] The UHI in the above embodiment is introduced as follows.

[0269] 5. UHI

[0270] When a terminal accesses an NG-RAN node, it can report terminal history information, including PCell and PSCell mobility history information (Mobility History Information, MHI). As long as the terminal is in a cell under the source NG-RAN node, the NG-RAN is responsible for collecting and storing UHI. When information needs to be discarded due to a full list, the information will be discarded in the order of its position in the list, starting with the oldest cell record. If the list is full and the terminal's history information is available, the terminal's history information should also be discarded.

[0271] During handover preparation, the source base station transmits the terminal's UHI to the target base station via a handover request (HANDOVER REQUEST) message, so that each base station can obtain information about the cells previously passed by the terminal and use this information to determine whether a ping-pong handover has occurred in the terminal.

[0272] UHI is a linked list consisting of the "Last Visited Cell Information" after the terminal enters the connected state, including the following contents:

[0273] Cell global identifier (Cel1GlobalIdenifier, CGI);

[0274] Cell type (or "cell size"), which can be "very small", "small", "medium", or "large";

[0275] The time the terminal stays in the cell;

[0276] Switching reason.

[0277] In the case of CHO, when the terminal successfully accesses a candidate cell of the target NG-RAN node, the target NG-RAN node updates the time the terminal spends in the cell of the latest PCell entry (i.e., the source cell). The updated time the UE spends in the source cell is equal to the time received from the source NG-RAN node during the "Handover Preparation" process + the time from the source NG-RAN node receiving the "Handover Request" message to the terminal receiving the "RRC Reconfiguration Complete" message. When the target NG-RAN node receives the SCG UHI from the source NG-RAN node via the Handover Request message, the target NG-RAN node updates the time the UE spends in the cell of the latest PSCell entry (i.e., the source PSCell).

[0278] In the disclosed embodiments, LTM involves the gNB changing a terminal's serving cell via a cell switch command issued by a MAC CE based on the terminal's Layer 1 measurement reports. The cell switch command indicates the gNB's preconfigured LTM candidate configurations for the terminal via RRC signaling. The terminal then switches to the target configuration based on the cell switch command. Because this process is based on Layer 1 measurement results, LTM can reduce handover latency compared to handovers based on Layer 3 measurement results.

[0279] For MHI in RAN2 and UHI in RAN3, considering the support of subsequent LTM and the frequent switching of LTM cells, the PCells / PSCells accessed in MHI / UHI can be recorded in frequent L1 / L2 triggered mobile cell switching to avoid and optimize pingpong switching in the network. The present disclosure provides the following information transmission method, device, and storage medium.

[0280] FIG2A is an interactive diagram of an information transmission method according to an embodiment of the present disclosure. As shown in FIG2A , the present disclosure embodiment relates to an information transmission method, which includes:

[0281] In step S2100 , the terminal 101 sends terminal capability information to the first network device 102 .

[0282] In some embodiments, the first network device 102 may be a network device corresponding to the first cell.

[0283] In some embodiments, the terminal capability information may be used to indicate whether the terminal has the capability to store and / or send the first information of the first cell.

[0284] In some embodiments, the first cell is a cell where the terminal resides. The first cell includes but is not limited to a historical cell where the terminal 101 once resided, and / or a cell where the terminal 101 currently resides.

[0285] In some embodiments, the first information includes but is not limited to LTM information of the first cell.

[0286] In some embodiments, the first information includes but is not limited to at least one of the following:

[0287] Whether the first cell is an LTM candidate cell;

[0288] Whether the terminal 101 is configured with LTM configuration in the first cell;

[0289] Whether the change of the resident cell is an LTM cell handover;

[0290] The first duration that the terminal 101 stays in the first cell.

[0291] In an example, the terminal 101 may receive an LTM candidate cell sent by a network device (the network device here may be a network device that has been accessed or is currently accessed), and the terminal 101 may determine whether the first cell is an LTM candidate cell.

[0292] In one example, LTM configuration includes, but is not limited to, switching configuration based on layer 1 or layer 2 triggering.

[0293] Exemplarily, the terminal 101 may determine that the LTM configuration is configured in the first cell when receiving the LTM configuration sent by the network device corresponding to the first cell.

[0294] Exemplarily, when the terminal 101 has not received the LTM configuration sent by the network device corresponding to the first cell, it is determined that the LTM configuration is not configured in the first cell.

[0295] Exemplarily, the terminal 101 may determine that the LTM configuration is configured in the first cell when the LTM configuration sent by the network device corresponding to the first cell is stored.

[0296] Exemplarily, the terminal 101 may determine that the LTM configuration is not configured in the first cell when the LTM configuration sent by the network device corresponding to the first cell is not stored.

[0297] In one example, terminal 101 sends an L1 measurement report to a network device. The network device makes an LTM decision and returns a cell handover command via a MAC CE. The terminal deletes the previous configuration and applies the target configuration. It initiates a random access procedure with the target network device, completing the change of the resident cell. This resident cell change is considered an LTM cell handover.

[0298] If the terminal 101 completes the cell handover or CHO based on the layer 3 measurement result, the change of the camped cell does not belong to the LTM cell handover.

[0299] In an example, the first duration is the duration that the terminal 101 resides in each first cell.

[0300] In an example, the first cell mentioned above may include but is not limited to a special cell, that is, at least one of a primary cell PCell and a primary secondary cell PSCell.

[0301] In some embodiments, the first network device 102 receives terminal capability information.

[0302] In some embodiments, the first network device 102 determines whether the terminal 101 has the ability to store and / or send the first information of the first cell based on the terminal capability information.

[0303] In some embodiments, the name of the terminal capability information is not limited and can be interchangeable with capability information, capability indication information, etc.

[0304] In some embodiments, step S2100 is an optional step. That is, the terminal 101 may not send the terminal capability information to the first network device 102. The first network device 102 may determine whether the terminal 101 has the ability to store and / or send the first information of the first cell based on at least one of the following:

[0305] Method 1: Obtain terminal capability information from other execution entities, and determine whether the terminal 101 has the capability to store and / or send the first information of the first cell based on the terminal capability information.

[0306] Method 2: The first network device 102 determines, based on a predefined method, such as a protocol agreement, whether the terminal has (or does not have) the ability to store and / or send the first information of the first cell.

[0307] Method three: the first network device 102 determines whether the terminal 101 has the ability to store and / or send the first information of the first cell based on auxiliary information such as the terminal type and the terminal service.

[0308] The present disclosure does not limit the solution in which the first network device 102 determines whether the terminal 101 has the ability to store and / or send the first information of the first cell when the terminal 101 does not report the terminal capability information.

[0309] In some embodiments, the name of the first information is not limited and can be interchangeable with LTM information, resident cell LTM information, etc.

[0310] Step S2101: Terminal 101 records first information of a first cell.

[0311] In some embodiments, the contents of the first cell and the first information have been introduced in the aforementioned embodiments and will not be repeated here.

[0312] In some embodiments, the terminal 101 may record the first information of the first cell if the first condition is met.

[0313] In some embodiments, the first condition may include, but is not limited to, at least one of the following:

[0314] The resident cell of the terminal 101 changes, and the first cell is the cell where the terminal 101 resides after the resident cell changes;

[0315] The first cell belongs to the LTM candidate cell;

[0316] Terminal 101 is configured with LTM configuration in the first cell;

[0317] Terminal 101 performs LTM cell handover.

[0318] In some embodiments, the terminal 101 may record the first information of the first cell when the camped cell changes. In this case, the first cell may be the cell where the terminal 101 camps after the camped cell changes, that is, the cell where the terminal 101 currently camps.

[0319] That is, each time the resident cell changes, the terminal 101 records the first information of the changed resident cell.

[0320] In some embodiments, the terminal 101 receives LTM candidate cells sent by a network device (which may be a network device that the terminal 101 has previously or currently accessed), including a first cell. When the terminal 101 determines that it is currently residing in the first cell, it records the first information of the first cell.

[0321] For example, if terminal 101 receives LTM candidate cells from a network device, including cell #1, cell #2, and cell #3, and terminal 101 is currently camping in cell #3, terminal 101 may record the first information of cell #3. Alternatively, if terminal 101 is currently camping in cell #4 and the camping cell changes, terminal 101 camps in cell #2, terminal 101 may record the first information of cell #2.

[0322] In some embodiments, when the LTM configuration is configured in the first cell, the terminal 101 records the first information of the first cell.

[0323] For example, upon receiving the LTM configuration sent by the network device corresponding to the first cell, the terminal 101 records the first information of the first cell.

[0324] In some embodiments, terminal 101 performs LTM cell handover, including but not limited to terminal 101 sending an L1 measurement report to a network device, the network device making an LTM decision, and returning a cell handover command via a MAC CE. The terminal deletes the previous configuration and applies the target configuration. A random access procedure is initiated with the target network device, thereby completing the LTM cell handover. At this point, terminal 101 may record first information about a first cell, which may be the cell where terminal 101 resides after the LTM cell handover.

[0325] In some embodiments, the terminal 101 may record the first information of the first cell when two or more of the above-mentioned first conditions are met.

[0326] In an example, the terminal 101 may record the first information of the first cell when the camped cell changes and the first cell camped on after the change is an LTM candidate cell.

[0327] In an example, when the resident cell changes and the second cell resident before the change is an LTM candidate cell, the terminal 101 may record the first information of the first cell, where the first cell is the cell where the terminal resides after the resident cell changes.

[0328] In an example, when the camped cell changes and the LTM configuration is configured in the first cell where the terminal 101 camps after the change, the terminal 101 may record the first information of the first cell.

[0329] In an example, when the resident cell changes and the LTM configuration is configured in the second cell where the terminal 101 resides before the change, the terminal 101 can record the first information of the first cell, where the first cell is the cell where the terminal resides after the resident cell changes.

[0330] In an example, the terminal 101 may record the first information of the first cell when the resident cell changes and LTM cell handover is performed.

[0331] In an example, the first cell in which the terminal 101 can reside belongs to an LTM candidate cell, and when the terminal 101 is configured with an LTM configuration in the first cell, the terminal 101 records the first information of the first cell.

[0332] In one example, the terminal 101 may record the first information of the first cell when at least one of the second cell where it resides before the cell change or the first cell where it resides after the cell change belongs to an LTM candidate cell and the terminal 101 is configured with LTM configuration in at least one of the second cell or the first cell.

[0333] In an example, the terminal 101 may record the first information of the first cell when the first cell in which the terminal 101 resides is an LTM candidate cell and the terminal 101 resides in the first cell after performing LTM cell handover.

[0334] In an example, the terminal 101 is configured with an LTM configuration in the first cell, and when the terminal 101 resides in the first cell after performing LTM cell switching, the terminal 101 records the first information of the first cell.

[0335] In an example, the terminal 101 may record the first information of the first cell when the camped cell is changed, the first cell camped after the change is an LTM candidate cell, and the terminal 101 is configured with LTM configuration in the first cell.

[0336] In an example, the terminal 101 may record the first information of the first cell when the camped cell changes, the first cell camped after the change belongs to the LTM candidate cell, and the terminal 101 camps on the first cell after performing LTM cell switching.

[0337] In an example, the terminal 101 may record the first information of the first cell when the first cell in which it resides is an LTM candidate cell, the LTM configuration is configured in the first cell, and the terminal 101 resides in the first cell after performing LTM cell switching.

[0338] In an example, the terminal 101 may record the first information of the first cell when the resident cell changes, the first cell resident after the change belongs to an LTM candidate cell, the LTM configuration is configured in the first cell, and the terminal 101 resides in the first cell after performing LTM cell switching.

[0339] The above is only an exemplary description, and the first condition may also include other conditions, which are not limited in this disclosure. In addition, when the terminal meets the first condition, the solution of recording the first information of the first cell should fall within the scope of protection of this disclosure.

[0340] In some embodiments, the terminal 101 may record the first information of the first cell into a first reporting variable.

[0341] In one example, the first report variable may be an existing report variable in an existing protocol, such as an MHI report variable. Exemplarily, the MHI report variable may be used to record mobility history information of the terminal. In the disclosed embodiment, an existing report variable in an existing protocol may be directly reused to record the first information of the first cell into the existing report variable.

[0342] In one example, the first reporting variable may be an LTM-specific reporting variable, such as an LTM-specific MHI reporting variable.

[0343] For example, a specific MHI reporting variable for LTM may be agreed upon by a protocol, and the specific MHI reporting variable may be used to record the first information of the first cell.

[0344] In one example, the LTM-specific report variables may share the same storage space with the existing report variables in the existing protocol, that is, the LTM-specific report variables may share the storage space of the existing report variables.

[0345] For example, the LTM-specific MHI report variable shares the storage space of the MHI report variable with the MHI report variable.

[0346] In one example, LTM-specific report variables may have a separate storage space, which is not limited in the present disclosure.

[0347] For example, LTM-specific MHI reporting variables have separate storage space.

[0348] In an example, the first report variable may also be other report variables existing in an existing protocol, or other report variables specific to the LTM, which is not limited in the present disclosure.

[0349] Step S2102 , the terminal 101 sends first information to the first network device 102 .

[0350] In some embodiments, the terminal 101 sends a first report to the first network device 102 . The first report may include but is not limited to first information of the first cell.

[0351] In some embodiments, the first report may include information pre-recorded by terminal 101 in one or more report variables. For example, terminal 101 pre-records first information of a first cell in a first report variable. The first report sent by terminal 101 to the first network device may include the information recorded in the first report variable, i.e., the first information of the first cell. It is understood that the first report may also include information in other report variables, which is not limited in this disclosure.

[0352] In an example, the first information may include LTM information of one or more cells under the first network device 102 .

[0353] For example, the first network device 102 has three cells, namely cell #1, cell #2 and cell #3. The first information sent by the terminal 101 includes the LTM information of cell #1, or includes the LTM information of cell #1 and the LTM information of cell #3.

[0354] In some embodiments, the first network device 102 may be a network device corresponding to the first cell.

[0355] In an example, the first cell is the cell where the terminal 101 resides after the resided cell is changed, and the first network device 102 may be a target access network device (eg, a target base station).

[0356] In some embodiments, the first network device 102 receives the first report, thereby acquiring first information of the first cell therein.

[0357] In some embodiments, the terminal 101 autonomously sends the first report to the first network device 102 .

[0358] In an example, the terminal 101 may periodically send the first report to the first network device 102 .

[0359] In an example, the terminal 101 may send the first report to the first network device 102 when a condition for reporting the first report is met.

[0360] Exemplarily, the first report is an L1 measurement report. When the terminal 101 determines that the reporting condition of the L1 measurement report is met, the terminal 101 may send the L1 measurement report to the first network device 102, where the report includes the first information of the first cell.

[0361] The above description is merely an example, and the present disclosure does not limit the information content included in the first report.

[0362] In some embodiments, the terminal 101 may send a first report to the first network device 102 based on the request message sent by the first network device 102 , where the report includes first information of the first cell.

[0363] In an example, the request message is used to request the terminal 101 to report the first information of the first cell.

[0364] In an example, the first network device 102 may send a request message to the terminal 101 when determining, based on the terminal capability information, that the terminal 101 has the ability to store and / or send the first information of the first cell.

[0365] In an example, the first network device 102 may send a request message to the terminal 101 based on the availability indication information sent by the terminal 101. The availability indication information may be used to indicate that the terminal 101 has LTM information of the first cell.

[0366] Exemplarily, the availability indication information may reuse existing availability indication information.

[0367] For example, the availability indication information may reuse the availability indication information of the UHI. After receiving the availability indication information of the UHI, the first network device 102 determines that the terminal 101 has terminal history information and the terminal 101 has LTM information of the first cell.

[0368] Exemplarily, the availability indication information may be separately defined availability indication information.

[0369] For example, a separate piece of availability indication information may be defined through protocol agreement, and the availability indication information is specifically used to indicate that the terminal 101 has LTM information of the first cell.

[0370] Exemplarily, the request message sent by the first network device 102 may reuse an existing request message, and the present disclosure does not limit the reused existing request message.

[0371] Exemplarily, the request message sent by the first network device 102 may be a separately defined request message, that is, the request message is specifically used to request the terminal 101 to report the LTM information of the first cell.

[0372] Step S2103: Terminal 101 deletes the second information contained in the first storage space.

[0373] In some embodiments, the first storage space is a space on the terminal 101 for storing a first report containing first information, such as UHI.

[0374] In some embodiments, the second information contained in the first storage space may satisfy but is not limited to at least one of the following:

[0375] The earliest storage is in the first storage space;

[0376] Contains first information of at least one cell.

[0377] In some embodiments, when the first storage space for storing the first information is full, the terminal 101 may delete the second information contained in the first storage space.

[0378] In an example, the terminal 101 may delete the second information based on any of the following methods:

[0379] The first way is to delete the second information contained in the first storage space based on a predefined way.

[0380] Exemplarily, the predefined method stipulates that the last one or more pieces of record information are deleted, where the last piece of record information here is the one or more pieces of record information with the earliest recording time.

[0381] For example, the predefined method stipulates that the last one or more record information related to the LTM is deleted, where the last record information here is the one or more record information with the earliest recording time.

[0382] Exemplarily, the predefined method stipulates deleting one or more record information related to the LTM.

[0383] Exemplarily, the predefined method stipulates deleting one or more record information that is not related to the LTM.

[0384] Exemplarily, the predefined method stipulates that if the source access network device includes an LTM candidate cell, and / or the target access network device includes an LTM candidate cell, multiple record information unrelated to LTM is deleted.

[0385] The above description is merely an exemplary description. All solutions in which the terminal 101 deletes the second information contained in the first storage space when the first storage space for storing the first information is full based on a predefined method should fall within the scope of protection of the present disclosure.

[0386] The second manner is to delete the second information contained in the first storage space based on the first indication information sent by the first network device 102 .

[0387] Exemplarily, the first instruction information indicates to delete the last one or more pieces of record information, where the last piece of record information is the one or more pieces of record information with the earliest recording time.

[0388] Exemplarily, the first instruction information indicates to delete the last one or more pieces of record information related to the LTM, where the last piece of record information is the one or more pieces of record information with the earliest recording time.

[0389] Exemplarily, the first instruction information indicates to delete one or more record information related to the LTM.

[0390] Exemplarily, the first instruction information instructs to delete one or more record information not related to the LTM.

[0391] Exemplarily, the first indication information indicates that if the source access network device includes an LTM candidate cell, and / or the target access network device includes an LTM candidate cell, multiple record information irrelevant to LTM is deleted.

[0392] Exemplarily, the name of the first indication information is not limited and can be interchangeable with configuration information, deletion indication information, etc.

[0393] The above description is merely an exemplary description. All solutions in which the terminal 101 deletes the second information contained in the first storage space based on the first indication information when the first storage space for storing the first information is full should fall within the scope of protection of the present disclosure.

[0394] In a third manner, based on a predefined manner and the first indication information sent by the first network device 102 , the second information contained in the first storage space is deleted.

[0395] For example, the predefined method stipulates that the last one or more records are deleted, where the last one or more records are the ones with the earliest recording time. The first indication information indicates that the one or more records related to the LTM are deleted. Terminal 101 can delete the one or more records related to the LTM with the earliest recording time.

[0396] Exemplarily, the predefined method stipulates that the last one or more pieces of record information related to LTM are deleted, where the last piece of record information here is the one or more pieces of record information with the earliest recording time. The first indication information indicates that if the source access network device includes an LTM candidate cell and / or the target access network device includes an LTM candidate cell, multiple pieces of record information unrelated to LTM are deleted. Terminal 101 may delete the one or more pieces of record information related to LTM with the earliest recording time, as well as delete multiple pieces of record information unrelated to LTM.

[0397] Exemplarily, the name of the second information is not limited and can be interchangeable with record information to be deleted, LTM information to be deleted (or non-LTM information), information to be deleted, etc.

[0398] The above description is merely an exemplary description, and any solution for jointly determining the second information to be deleted by a predefined method and the first indication information should fall within the scope of protection of the present disclosure.

[0399] It should be noted that step S2103 can be performed before or after step S2101. For example, when terminal 101 determines to record the first information, it can first delete the second information and then record the first information. Alternatively, after recording the first information, terminal 101 determines that there is insufficient storage space and deletes the second information. Furthermore, this application does not limit the order in which steps S2103 and S2102 are performed.

[0400] Step S2104 : The first network device 102 deletes the third information contained in the second storage space and / or discards the first report from the terminal 101 including the first information.

[0401] In some embodiments, the second storage space is a space on the first network device 102 for storing the first report containing the first information, such as the UHI.

[0402] In some embodiments, the third information contained in the second storage space may satisfy but is not limited to at least one of the following:

[0403] The earliest one is stored in the second storage space;

[0404] Contains first information of at least one cell.

[0405] In some embodiments, the first network device 102 may delete the third information contained in the second storage space based on a predefined method.

[0406] This specific implementation is similar to the solution in which the terminal 101 deletes the second information contained in the first storage space based on a predefined method, and is not described again here.

[0407] In some embodiments, the first network device 102 may discard the first report including the first information from the terminal 101, such as discarding the UHI from the terminal 101, when the second storage space for storing the first information is full and the first report including the first information from the terminal 101 is available, such as the UHI is available.

[0408] In some embodiments, the first network device 102 may delete the third information contained in the second storage space and discard the first report including the first information from the terminal 101, such as discarding the UHI from the terminal 101, when the second storage space for storing the first information is full.

[0409] In some embodiments, the first network device 102 sends a first instruction to the terminal 101, instructing it to delete the second information contained in the first storage space. The solution for the terminal 101 to delete the second information contained in the first storage space based on the first instruction has been described in the previous embodiment and will not be repeated here.

[0410] In step S2105 , the second network device 103 sends second indication information to the first network device 102 .

[0411] In some embodiments, the second indication information is used to indicate a second duration for which the terminal resides in the second cell.

[0412] The second cell may be a historical cell where the terminal 101 resides before the change of the resided cell, and the number of the second cells may be one or more. Accordingly, the second network device 103 may be a network device corresponding to the second cell, that is, a source access network device (eg, a source base station).

[0413] In some embodiments, the first network device 102 receives the second indication information.

[0414] In some embodiments, the second network device 103 may send a handover request message to the first network device 102 , including the second duration.

[0415] In some embodiments, the second network device 103 actively sends the second indication information to the first network device 102 .

[0416] In one example, when the second network device 103 wishes to delete the stored record of the second duration of the terminal 101 staying in the second cell, it may send the second indication information to the first network device 102. After sending the second indication information, the second duration is deleted.

[0417] In an example, the storage space on the second network device 103 for storing the first report containing the first information is full, and the second indication information may be sent to the first network device 102 .

[0418] The above description is merely an exemplary description, and all solutions in which the first network device 102 actively sends the second indication information should fall within the protection scope of the present disclosure.

[0419] In some embodiments, the second network device 103 reuses an existing cell switching process to send the second indication information to the first network device 102 .

[0420] In an example, the second network device 103 reuses an existing handover request or handover command in the protocol, and sends the second indication information to the first network device 102 during the cell handover process.

[0421] In some embodiments, the second network device 103 sends the second indication information to the first network device 102 based on the request of the first network device 102 .

[0422] In one example, the first network device 102 receives the first message of the first cell sent by the terminal 101, and sends the request message to the second network device 103, requesting the second network device 103 to provide the second duration of the terminal 101's stay in the second cell. At this time, the second network device 103 can send the second indication information to the first network device 102 based on the request message.

[0423] The above description is merely an exemplary description, and all solutions in which the second network device 103 sends the second indication information to the first network device 102 when certain conditions are met should fall within the scope of protection of this disclosure.

[0424] In some embodiments, the name of the second indication information is not limited and can be interchangeable with duration indication information, dwell duration information, etc.

[0425] Step S2106: The first network device 102 updates the total duration of the terminal 101 staying in the second cell.

[0426] In some embodiments, the first network device 102 may update the total duration of the terminal 101 staying in the second cell based on the second indication information.

[0427] In some embodiments, the first network device 102 may determine a second duration, that is, a second duration during which the terminal 101 resides in the second cell, based on the second indication information.

[0428] In addition, the first network device 102 can determine a third duration, which can be the duration from the first time point to the second time point, wherein the first time point can be the time point when the first network device 102 receives the handover request (HO) message sent by the second network device 103, and the second time point is the time point when the first network device 102 receives the radio resource control RRC reconfiguration completion message sent by the terminal 101.

[0429] Furthermore, the first network device 102 calculates the sum of the second duration and the third duration, and updates the total duration of the terminal 101 staying in the second cell to the sum.

[0430] In step S2107 , the first network device 102 sends third indication information to the second network device 103 , where the third indication information includes the first information.

[0431] In some embodiments, the third indication information may be used to instruct the second network device 103 to determine whether there is an LTM switching optimization problem.

[0432] In some embodiments, after receiving the first information of the first cell sent by the terminal 101, the first network device 102 can include the first information in the third indication information and send it to the second network device 103 in order to avoid the LTM switching optimization problem as much as possible. The second network device 103 determines whether there is an LTM switching optimization problem based on the first information.

[0433] In some embodiments, the LTM switching optimization problem may include, but is not limited to, problems such as LTM ping-pong switching.

[0434] In some embodiments, the second network device 103 receives third indication information.

[0435] In some embodiments, the name of the third indication information is not limited and can be interchangeable with problem determination indication information, indication information, etc.

[0436] Step S2108 : After determining the existing LTM switching optimization problem based on the first information, the first network device 102 sends fourth indication information to the second network device 103 .

[0437] In some embodiments, the first network device 102 may determine the existing LTM switching optimization problem based on the first information sent by the terminal 101 .

[0438] In an example, the first network device 102 may serve as a target access network device and, when it is determined that an LTM handover optimization problem exists, determine a specific LTM handover optimization problem.

[0439] In some embodiments, LTM switching optimization problems may include but are not limited to LTM ping-pong switching and other issues.

[0440] In some embodiments, the first information includes at least one of the following: the first cell is an LTM candidate cell; the terminal 101 is configured with an LTM configuration in the first cell; the change of the resident cell is an LTM cell handover; the first duration of the terminal 101's stay in the first cell, and the first duration is less than or equal to a preset duration. The first network device 102 can determine whether there is an LTM ping-pong handover problem based on whether the terminal 101 frequently switches between two different RATs (e.g., two cells under different RATs) or whether the terminal 101 frequently switches between different network devices within the same RAT (e.g., two cells under the same RAT). In some embodiments, after determining that an LTM handover optimization problem exists, the first network device 102 can send fourth indication information to the second network device 103. The fourth indication information can be used to indicate the current LTM handover optimization problem determined by the first network device 102.

[0441] In some embodiments, the second network device 103 receives fourth indication information.

[0442] In some embodiments, the name of the fourth indication information is not limited and can be interchangeable with problem indication information, indication information, etc.

[0443] In some embodiments, step S2108 may not be performed, that is, after the first network device 102 determines the existing LTM switching optimization problem, it may not interact with the second network device 103 .

[0444] In some embodiments, after determining the existing LTM switching optimization problem, the first network device 102 may perform at least one of the following optimization operations: increasing the LTM cell switching threshold; switching to a traditional cell switching method (including but not limited to the above-mentioned switching, conditional switching, etc.).

[0445] Step S2109 : The second network device 103 determines whether there is an LTM switching optimization problem.

[0446] In some embodiments, the second network device 103 may determine whether there is an LTM switching optimization problem based on the third indication information in combination with its own policy and the first information.

[0447] In some embodiments, the second network device 103 may determine that there is an LTM switching optimization problem based on the fourth indication information.

[0448] In some embodiments, after receiving the fourth indication information, the second network device 103 may determine whether there is an LTM switching optimization problem based on its own policy.

[0449] In some embodiments, the second network device 103 may determine that there is an LTM switching optimization problem based on the third indication information and the fourth indication information.

[0450] In some embodiments, after receiving the third indication information and the fourth indication information, the second network device 103 may determine whether there is an LTM switching optimization problem based on its own policy.

[0451] In some embodiments, the second network device 103 autonomously determines whether there is an LTM handover optimization problem.

[0452] In some embodiments, the second network device 103 can act as a source access network device to determine whether there is an LTM switching optimization problem, and send the analyzed LTM switching optimization problem to the first network device 102 (i.e., the target access network device) so that the first network device 102 can perform LTM switching optimization to reduce or avoid potential ping-pong effects.

[0453] In some embodiments, the second network device 103 can serve as a source access network device to determine whether an LTM switching optimization problem exists, and does not interact with the first network device 102 (ie, the target access network device), thereby avoiding occupying network interface resources and achieving high availability.

[0454] Among them, the possible LTM switching optimization problem has been introduced in the above embodiment and will not be repeated here.

[0455] In some embodiments, the second network device 103 determines the existing LTM switching optimization problem in a manner similar to the manner in which the first network device 102 determines the existing LTM switching optimization problem, which is not described again herein.

[0456] In some embodiments, after determining the existing LTM switching optimization problem, the second network device 103 can perform at least one of the following optimization operations: increase the LTM cell switching threshold; switch to a traditional cell switching method (including but not limited to the above-mentioned switching, conditional switching, etc.).

[0457] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0458] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0459] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0460] In some embodiments, terms such as "certain", "preseted", "preset", "setting", "indicated", "a certain", "any", "first", and "designated" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, or first A, etc., but not limited to this.

[0461] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S2100 to S2109. For example, step S2100 can be implemented as an independent embodiment, step S2101 can be implemented as an independent embodiment, step S2102 can be implemented as an independent embodiment, steps S2101+S2102 can be implemented as an independent embodiment, step S2103 can be implemented as an independent embodiment, steps S2101+S2102+step S2103 can be implemented as an independent embodiment, step S2104 can be implemented as an independent embodiment, steps S2103+S2104 can be implemented as an independent embodiment, step S2105 can be implemented as an independent embodiment, and step S2106 can be implemented as an independent embodiment. It can be implemented as an independent embodiment, step S2105+S2106 can be implemented as an independent embodiment, step S2107 can be implemented as an independent embodiment, step S2108 can be implemented as an independent embodiment, step S2109 can be implemented as an independent embodiment, step S2107+S2109 can be implemented as an independent embodiment, step S2108+S2109 can be implemented as an independent embodiment, step S2107+S2108+S2109 can be implemented as an independent embodiment, and steps S2100 to S2109 can be implemented as independent embodiments, but are not limited to this.

[0462] In some embodiments, step S2100 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the ability of terminal 101 to store and / or send the first information of the first cell is the minimum capability of terminal 101, or if first network device 102 determines the ability of terminal 101 to store and / or send the first information of the first cell through indication information sent by another execution entity, step S2100 may not be performed.

[0463] In some embodiments, step S2101 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the first condition is not met, or if the terminal 101 does not have the ability to store and / or send the first information of the first cell, step S2101 may not be performed.

[0464] In some embodiments, step S2102 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the conditions for submitting the first report are not met, or if the first network device 102 obtains the first report from another execution entity, step S2102 may not be executed.

[0465] In some embodiments, step S2103 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, when the first storage space is not full, step S2103 may not be performed.

[0466] In some embodiments, step S2104 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, when the second storage space is not full, step S2104 may not be performed.

[0467] In some embodiments, step S2105 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the first network device 102 obtains the content of the second indication information from another execution entity, step S2105 may not be performed.

[0468] In some embodiments, step S2106 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if another execution entity updates the total duration of the terminal 101's stay in the second cell, or if the first network device 102 has already updated the total duration of the terminal 101's stay in the second cell, step S2106 may not be executed.

[0469] In some embodiments, step S2107 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the second network device 103 determines whether an LTM handover optimization problem exists based on indication information sent by another execution entity, or if the second network device 103 independently determines whether an LTM handover optimization problem exists, step S2107 may not be performed.

[0470] In some embodiments, step S2108 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the first network device 102, as the target access network device, determines that an LTM handover optimization problem exists and does not need to interact with the source access network device, step S2108 may not be performed.

[0471] In some embodiments, step S2109 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the second network device 103 directly determines that there is an LTM switching optimization problem based on the fourth indication information, step S2109 may not be performed.

[0472] In some embodiments, the execution order of step S2103 and step S2104 is not limited.

[0473] In some embodiments, the execution order of step S2107 and step S2108 is not limited.

[0474] In some embodiments, either step S2107 or step S2108 may be performed. In some embodiments, steps S2100 to S2109 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0475] It should be noted that the first network device 102 and the second network device 103 can each independently determine the existing LTM handover optimization problem without interacting with each other. Alternatively, after at least one of the first network device 102 and the second network device 103 determines the existing LTM handover optimization problem, they can interact with each other to provide the determined existing LTM handover optimization problem to the other device.

[0476] In some embodiments, each of steps S2100 to S2109 can be executed separately, which is not limited in the present disclosure.

[0477] In the above embodiment, the terminal can record the LTM information of the cell where it resides and provide it to the network device during mobility, thereby optimizing the mobility management configuration, improving the reliability of mobility decisions, helping to reduce ping-pong handovers, and improving availability.

[0478] FIG2B is an interactive diagram of an information transmission method according to an embodiment of the present disclosure. As shown in FIG2B , the present disclosure embodiment relates to an information transmission method, which can be executed by terminal 101, and the method includes:

[0479] Step S2201: Record first information of the first cell.

[0480] In some embodiments, the optional implementation of step S2201 can refer to the optional implementation of step S2101 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0481] Step S2202, sending the first information.

[0482] In some embodiments, terminal 101 may send the first information to the network device.

[0483] The network devices may include but are not limited to the first network device 102 and the second network device 103 mentioned above.

[0484] In an example, the terminal 101 sends the first information to the connected network device each time it performs cell switching.

[0485] In an example, the terminal 101 sends the first information to the connected network device each time it performs LTM cell switching.

[0486] In one example, when the cell under the network device is an LTM candidate cell, the terminal 101 sends the first information to the network device.

[0487] In one example, when the terminal 101 initially camps on a cell or changes the camped cell, the terminal 101 sends the first information to the network device.

[0488] In one example, the network equipment includes but is not limited to access network equipment and core network equipment.

[0489] In an example, when the terminal 101 determines that the network device does not store the first report of the terminal including the first information, such as UHI, the terminal 101 sends the first information to the network device.

[0490] In one example, the network device may determine the existing LTM handover optimization problem based on the received first information and then perform LTM handover optimization. The network device that determines the existing LTM handover optimization problem and then performs LTM handover optimization may include but is not limited to a source access network device and a target access network device.

[0491] In some embodiments, the optional implementation of step S2202 can refer to the optional implementation of step S2102 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0492] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S2201 and S2202. Step S2201 can be implemented as an independent embodiment, step S2202 can be implemented as an independent embodiment, and steps S2201+S2202 can be implemented as independent embodiments, but are not limited thereto.

[0493] In some embodiments, step S2201 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the terminal 101 does not have the ability to store and / or send the first information of the first cell, or if the terminal 101 directly reports the first information, step S2201 may not be performed.

[0494] In some embodiments, step S2202 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the terminal 101 does not have the ability to store and / or send the first information of the first cell, or the terminal 101 has already reported the first information to the network device, or the network device obtains the first information from another execution entity, step S2202 may not be performed.

[0495] In some embodiments, step S2201 and step S2202 may be performed either alone or both, and this disclosure does not limit this.

[0496] In the above embodiment, the terminal can record and / or send the first information of the first cell, which improves the reliability of mobility decision-making, helps to reduce ping-pong handover, and has high availability.

[0497] FIG2C is an interactive diagram of an information transmission method according to an embodiment of the present disclosure. As shown in FIG2C , an embodiment of the present disclosure relates to an information transmission method, which can be executed by a network device, and the method includes:

[0498] Step S2301, obtain first information.

[0499] In some embodiments, network devices include but are not limited to access network devices and core network devices.

[0500] In some embodiments, the network device includes but is not limited to the first network device 102 and the second network device 103 described above.

[0501] In some embodiments, the first network device 102 may be a target access network device, and the second network device 103 may be a source access network device.

[0502] In some embodiments, the network device may obtain the first information of the first cell from the terminal 101 .

[0503] In some embodiments, the network device may obtain the first information of the first cell provided by other execution entities.

[0504] In some embodiments, the network device may autonomously implement the content indicated by the first information.

[0505] In some embodiments, the optional implementation of step S2301 can refer to the optional implementation of step S2102 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here. In step S2302 , the existing LTM switching optimization problem is determined.

[0506] In some embodiments, the first network device 102 and the second network device 103 can each determine the existing LTM switching optimization problem without interacting with each other.

[0507] In some embodiments, the first network device 102 and the second network device 103 may each determine an existing LTM switching optimization problem based on the first information.

[0508] In some embodiments, the first network device 102 as the target access network device may determine the existing LTM handover optimization problem and provide it to the source access network device (ie, the second network device 103 ).

[0509] In some embodiments, the second network device 103 may serve as a source access network device to determine the existing LTM handover optimization problem and provide the problem to the target access network device (ie, the first network device 102 ).

[0510] Step S2303: Execute LTM switching optimization.

[0511] In some embodiments, the first network device 102, as the target access network device, can determine the problem to be optimized based on the LTM switching optimization problem determined by itself and / or the LTM switching optimization problem provided by the source access network device (i.e., the second network device 103), and then perform LTM switching optimization.

[0512] In some embodiments, the second network device 103, as the source access network device, can determine the problem to be optimized based on the LTM switching optimization problem determined by itself and / or the LTM switching optimization problem provided by the target access network device (i.e., the first network device 102), and then perform LTM switching optimization.

[0513] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S2301 to S2303. Step S2301 can be implemented as an independent embodiment, step S2302 can be implemented as an independent embodiment, steps S2301+S2302 can be implemented as an independent embodiment, step S2303 can be implemented as an independent embodiment, and steps S2301 to S2303 can be implemented as independent embodiments, but are not limited thereto.

[0514] In the above embodiment, the network device can determine the existing LTM switching optimization problem based on the acquired LTM information of the first cell, and perform LTM switching optimization, thereby optimizing the mobility management configuration, improving the reliability of mobility decisions, helping to reduce ping-pong switching, and having high availability.

[0515] FIG2D is an interactive diagram of an information transmission method according to an embodiment of the present disclosure. As shown in FIG2D , the present disclosure embodiment relates to an information transmission method, which includes:

[0516] In step S2401 , the second network device 103 sends second indication information to the first network device 102 .

[0517] In some embodiments, the optional implementation of step S2401 can refer to the optional implementation of step S2105 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0518] Step S2402: The first network device 102 updates the total duration of the terminal 101 staying in the second cell.

[0519] In some embodiments, the optional implementation of step S2402 can refer to the optional implementation of step S2106 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0520] Step S2403 : The first network device 102 sends third indication information and / or fourth indication information to the second network device 103 .

[0521] In some embodiments, the optional implementation of step S2403 can refer to the optional implementation of step S2107 and step S2108 in Figure 2A, and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0522] Step S2404: The second network device 103 determines whether there is an LTM switching optimization problem.

[0523] In some embodiments, the optional implementation of step S2404 can refer to the optional implementation of step S2109 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0524] In some embodiments, the first network device 102 and the second network device 103 may perform LTM switching optimization. In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S2401 to S2404. Step S2401 can be implemented as an independent embodiment, step S2402 can be implemented as an independent embodiment, steps S2401+S2402 can be implemented as an independent embodiment, step S2403 can be implemented as an independent embodiment, steps S2401 to S2403 can be implemented as independent embodiments, step S2404 can be implemented as an independent embodiment, and steps S2401 to S2404 can be implemented as independent embodiments, but are not limited thereto.

[0525] In the above embodiment, the target access network device can update the total duration that terminal 101 resides in the source cell based on the second indication information sent by the source access network device. Furthermore, the target access network device and the source access network device can interact with each other, allowing the source access network device to determine whether an LTM handover optimization issue exists. This helps network devices quickly identify existing LTM handover optimization issues, improves the efficiency of mobility decision-making, and enhances usability.

[0526] FIG3A is an interactive diagram of an information transmission method according to an embodiment of the present disclosure. As shown in FIG3A , the present disclosure embodiment relates to an information transmission method, which can be executed by terminal 101, and the method includes:

[0527] Step S3101: record first information of the first cell.

[0528] In some embodiments, the optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0529] Step S3102, sending the first information.

[0530] In some embodiments, the terminal 101 sends first information to the first network device 102 .

[0531] In some embodiments, the first network device 102 receives the first information.

[0532] In some embodiments, the optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0533] Step S3103: Delete the second information contained in the first storage space.

[0534] In some embodiments, the optional implementation of step S3103 can refer to the optional implementation of step S2103 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0535] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3103. Step S3101 can be implemented as an independent embodiment, step S3102 can be implemented as an independent embodiment, steps S3101+S3102 can be implemented as an independent embodiment, step S3103 can be implemented as an independent embodiment, and steps S3101 to S3103 can be implemented as independent embodiments, but are not limited thereto.

[0536] In the above embodiment, the terminal can record the LTM information of the cell where it resides and provide it to the network device during mobility, thereby optimizing the mobility management configuration, improving the reliability of mobility decisions, helping to reduce ping-pong handovers, and improving availability.

[0537] FIG3B is an interactive diagram of an information transmission method according to an embodiment of the present disclosure. As shown in FIG3B , the present disclosure embodiment relates to an information transmission method, which can be executed by the first network device 102. The method includes:

[0538] Step S3201, obtain first information.

[0539] In some embodiments, the first network device 102 may obtain the first information from the terminal 101, but is not limited thereto. The first network device 102 may also receive the first information sent by other entities.

[0540] In some embodiments, the first network device 102 obtains first information determined according to a predefined rule.

[0541] In some embodiments, the first network device 102 performs processing to obtain the first information.

[0542] In some embodiments, step S3201 is omitted, the first network device 102 autonomously implements the function indicated by the first information, or the first network device 102 obtains the first information based on predefined rules or protocol agreements, or the above function is default or default.

[0543] In some embodiments, the optional implementation of step S3201 can refer to the optional implementation of step S2101 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0544] Step S3202 : Delete the third information contained in the second storage space and / or discard the first report from the terminal 101 including the first information.

[0545] In some embodiments, the optional implementation of step S3202 can refer to the optional implementation of step S2104 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0546] Step S3203: Obtain second indication information.

[0547] In some embodiments, the first network device 102 may obtain the second indication information from the second network device 103 , but is not limited thereto. The first network device 102 may also receive the second indication information sent by other entities.

[0548] In some embodiments, the first network device 102 obtains second indication information determined according to a predefined rule.

[0549] In some embodiments, the first network device 102 performs processing to obtain the second indication information.

[0550] In some embodiments, step S3201 is omitted, the first network device 102 autonomously implements the function indicated by the second indication information, or the first network device 102 obtains the second indication information based on predefined rules or protocol agreements, or the above function is default or default.

[0551] In some embodiments, the optional implementation of step S3203 can refer to the optional implementation of step S2105 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0552] Step S3204: Update the total duration of the terminal 101 staying in the second cell.

[0553] In some embodiments, the optional implementation of step S3204 can refer to the optional implementation of step S2106 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0554] Step S3205: Send third indication information.

[0555] In some embodiments, the first network device 102 may send third indication information to the second network device 103 .

[0556] In some embodiments, the second network device 103 receives third indication information.

[0557] In some embodiments, the optional implementation of step S3205 can refer to the optional implementation of step S2107 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0558] Step S3206: Send fourth indication information.

[0559] In some embodiments, the first network device 102 may send fourth indication information to the second network device 103 .

[0560] In some embodiments, the second network device 103 receives fourth indication information.

[0561] In some embodiments, the optional implementation of step S3206 can refer to the optional implementation of step S2108 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0562] In some embodiments, the first network device 102 can perform LTM handoff optimization.

[0563] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3206.

[0564] In the above embodiment, the first network device can obtain the first information and interact with the second network device to optimize the mobility management configuration, improve the reliability and execution efficiency of mobility decisions, help reduce ping-pong switching, and have high availability.

[0565] FIG3C is an interactive diagram of an information transmission method according to an embodiment of the present disclosure. As shown in FIG3C , the present disclosure embodiment relates to an information transmission method, which can be executed by the second network device 103. The method includes:

[0566] Step S3301: Send the second indication information.

[0567] In some embodiments, the second network device 103 sends second indication information to the first network device 102 .

[0568] In some embodiments, the optional implementation of step S3301 can refer to the optional implementation of step S2105 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0569] Step S3302: Obtain third indication information.

[0570] In some embodiments, the second network device 103 may obtain the third indication information from the first network device 102 , but is not limited thereto. The second network device 103 may also receive the third indication information sent by other entities.

[0571] In some embodiments, the second network device 103 obtains third indication information determined according to a predefined rule.

[0572] In some embodiments, the second network device 103 performs processing to obtain the third indication information.

[0573] In some embodiments, step S3302 is omitted, the second network device 103 autonomously implements the function indicated by the third indication information, or the second network device 103 obtains the third indication information based on predefined rules or protocol agreements, or the above function is default or default.

[0574] In some embodiments, the optional implementation of step S3302 can refer to the optional implementation of step S2107 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0575] Step S3303: Obtain fourth indication information.

[0576] In some embodiments, the second network device 103 may obtain the fourth indication information from the first network device 102 , but is not limited thereto. The second network device 103 may also receive the fourth indication information sent by other entities.

[0577] In some embodiments, the second network device 103 obtains fourth indication information determined according to a predefined rule.

[0578] In some embodiments, the second network device 103 performs processing to obtain the fourth indication information.

[0579] In some embodiments, step S3303 is omitted, the second network device 103 autonomously implements the function indicated by the fourth indication information, or the second network device 103 obtains the fourth indication information based on predefined rules or protocol agreements, or the above function is default or default.

[0580] In some embodiments, the optional implementation of step S3303 can refer to the optional implementation of step S2108 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0581] Step S3304: Determine whether there is an LTM switching optimization problem.

[0582] In some embodiments, the optional implementation of step S3304 can refer to the optional implementation of step S2109 in Figure 2A and other related parts of the embodiment involved in Figure 2A, which will not be repeated here.

[0583] In some embodiments, the second network device 103 can perform LTM handover optimization.

[0584] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S3301 to S3304.

[0585] In the above embodiment, the second network device can interact with the first network device to optimize the mobility management configuration, improve the reliability and execution efficiency of mobility decisions, help reduce ping-pong handovers, and improve availability.

[0586] The following is an example to further illustrate the above process:

[0587] An embodiment of the present disclosure provides a method for enhancing the recording and reporting of LTM-related mobility history information. The service node of the terminal is responsible for collecting the terminal's LTM historical access information and sending it to the target base station during the terminal's movement. The target base station determines that a ping-pong handover has occurred based on the LTM historical access information and sends an indication information to the source base station of the terminal for optimizing mobility management configuration and decision-making.

[0588] In some embodiments, in response to a change in the cell where the terminal resides, the terminal records LTM-related information of the cell into a first reporting variable and reports the information to the source access network device.

[0589] The LTM-related information of the resident cell indicates at least one of the following:

[0590] -Whether the camped cell is an LTM candidate cell;

[0591] -Whether the terminal is configured with LTM in the cell where it resides;

[0592] -Whether the cell change is an LTM cell handover;

[0593] -The time the terminal stays in the LTM candidate cell.

[0594] The resident cells include PCell and / or Pscell.

[0595] In some embodiments, when a terminal switches from a source access network device to a target access network device, the source access network device sends second indication information to the target access network device based on LTM-related information of the resident cell reported by the terminal. The second indication information includes but is not limited to LTM-related information of the resident cell. The target access network device performs at least one of the following based on the second indication information:

[0596] -Updates the terminal's stay time in the cell of the source access network device. The stay time is the sum of the stay time sent by the source access network device in the cell and the time from receiving the handover request from the source access network device to the completion of the terminal reconfiguration. The target access network device includes the LTM candidate target cell.

[0597] -Determine whether there is an LTM-related handover optimization problem, and send third indication information and / or fourth indication information to the source access network device to indicate the LTM-related handover optimization problem.

[0598] In an embodiment of the present disclosure, in response to a change in the cell where the terminal resides, the terminal records the LTM-related information of the cell in the first report variable and reports it to the first network device through the first report (the access network device to which the terminal is currently connected, which can be understood as the target access network device after the change of the cell).

[0599] Based on the above, the LTM-related information of the camped cell is used to indicate at least one of the following:

[0600] Whether the resident cell is an LTM candidate cell;

[0601] Whether the terminal is configured with LTM in the cell where it resides;

[0602] Whether the mobile process is an LTM cell handover;

[0603] The time the terminal stays in the LTM candidate cell (that is, the time the terminal stays in the serving cell after the camped cell is changed).

[0604] Based on the above, further, the second network device sends the time the terminal stays in the second node cell to the first node, so that the first network device updates the time the terminal stays in the source cell (ie, the second cell under the second network device).

[0605] Based on the above, updating the terminal's stay time in the source cell includes LTM handover, where the stay time is the stay time in the source cell sent by the second network device plus the time from receiving the handover request sent by the second network device to the completion of terminal reconfiguration. The second network device includes the LTM candidate target cell.

[0606] Based on the above, further, the first network device sends a third indication message to the second network device (source access network device) based on the LTM-related information of the resident cell to determine whether there is an LTM-related switching optimization problem. Further optionally, a fourth indication message is sent to the first network device to indicate the LTM-related switching optimization problem.

[0607] Based on the above, the first report variable can be an existing report variable in the existing protocol, such as the MHI report variable, or an LTM-specific report variable, such as the LTM-specific MHI report variable. The first report variable can share the storage space of the existing report variables or have additional storage space.

[0608] Based on the above, when the terminal history information needs to be discarded because the list is full, it is determined which record to discard according to the protocol agreement or network implementation.

[0609] For example, when the terminal history information list is full, according to the protocol, the last record information is removed, or the last LTM-related record information is removed, or all (non) LTM-related record information is removed, or, when at least one of the source access network device or the target access network device includes an LTM candidate cell, all non-LTM-related records are removed.

[0610] Optionally, both the terminal and the network device may perform the above discarding process.

[0611] Based on the above, the camped cell includes PCell and / or PSCell.

[0612] Based on the above, the terminal is a terminal that supports storing LTM mobility history information. Optionally, the terminal reports capability information to the network device (eg, the first network device) to indicate whether the terminal supports the capability.

[0613] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., a first network device, a second network device, etc.) in any of the above methods.

[0614] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0615] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0616] FIG4A is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure. As shown in FIG4A , a terminal 4100 may include: a processing module 4101 .

[0617] In some embodiments, the processing module 4101 is configured to record first information of a first cell; wherein the first cell is a cell where the terminal resides, and the first information includes layer 1 and layer 2 triggered mobility LTM information of the first cell.

[0618] Optionally, the processing module 4101 is used to execute at least one of the other steps (such as step S2101 and step S2103, but not limited thereto) executed by the terminal 4100 in any of the above methods, which will not be repeated here.

[0619] In some embodiments, the terminal 4100 may further include a transceiver module 4102 (not shown in FIG. 4A ).

[0620] Optionally, the above-mentioned transceiver module 4102 is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S2100, step S2102, but not limited to this) performed by the terminal 4100 in any of the above methods, which will not be repeated here.

[0621] FIG4B is a schematic diagram of the structure of a first network device according to an embodiment of the present disclosure. As shown in FIG4B , the first network device 4200 may include a transceiver module 4201 .

[0622] In some embodiments, the transceiver module 4201 is configured to receive first information sent by a terminal, where the first information includes layer 1 and layer 2 triggered mobility LTM information of a first cell, where the first cell is a cell where the terminal resides.

[0623] Optionally, the above-mentioned transceiver module 4201 is used to execute at least one of the communication steps such as sending and / or receiving performed by the first network device 4200 in any of the above methods (for example, step S2100, step S2102, step S2105, step S2107, step S2108, but not limited to these), which will not be repeated here.

[0624] In some embodiments, the first network device 4200 may further include a processing module 4202 (not shown in FIG. 4B ).

[0625] Optionally, the transceiver module 4202 is configured to execute at least one of the other steps (eg, step S2104, step S2106, but not limited thereto) executed by the first network device 4200 in any of the above methods, which will not be described in detail here.

[0626] FIG4C is a schematic diagram of the structure of the first network device proposed in an embodiment of the present disclosure. As shown in FIG4C , the second network device 4300 may include: a transceiver module 4301 .

[0627] In some embodiments, the transceiver module 4201 is configured to send second indication information to the first network device, where the second indication information is used to indicate a second duration for which the terminal resides in the second cell.

[0628] Optionally, the above-mentioned transceiver module 4301 is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S2105, step S2107, step S2108, but not limited to these) performed by the second network device 4300 in any of the above methods, which will not be repeated here.

[0629] In some embodiments, the second network device 4300 may further include a processing module 4302 (not shown in FIG. 4C ).

[0630] Optionally, the transceiver module 4302 is configured to execute at least one of the other steps (such as step S2109, but not limited thereto) executed by the second network device 4300 in any of the above methods, which will not be described in detail here.

[0631] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0632] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0633] Figure 5A is a schematic diagram of the structure of a communication device 5100 proposed in an embodiment of the present disclosure. Communication device 5100 can be a network device (e.g., a first network device, a second network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. Communication device 5100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0634] As shown in Figure 5A, the communication device 5100 includes one or more processors 5101. The processor 5101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 5100 is used to perform any of the above methods. Optionally, one or more processors 5101 are used to call instructions to enable the communication device 5100 to perform any of the above methods.

[0635] In some embodiments, the communication device 5100 further includes one or more transceivers 5102. When the communication device 5100 includes one or more transceivers 5102, the transceiver 5102 performs at least one of the communication steps (e.g., steps S2100, S2102, S2105, S2107, and S2108, but not limited thereto) of sending and / or receiving in the above method, and the processor 5101 performs at least one of the other steps (e.g., steps S2101, S2103, S2104, S2106, and S2109, but not limited thereto). In alternative embodiments, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, terms such as transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface can be replaced with each other, terms such as transmitter, transmitting unit, transmitter, and transmitting circuit can be replaced with each other, and terms such as receiver, receiving unit, receiver, and receiving circuit can be replaced with each other.

[0636] In some embodiments, the communication device 5100 further includes one or more memories 5103 for storing data. Alternatively, all or part of the memories 5103 may be located outside the communication device 5100. In alternative embodiments, the communication device 5100 may include one or more interface circuits 5104. Optionally, the interface circuits 5104 are connected to the memory 5102 and may be configured to receive data from the memory 5102 or other devices, or to send data to the memory 5102 or other devices. For example, the interface circuits 5104 may read data stored in the memory 5102 and send the data to the processor 5101.

[0637] The communication device 5100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 5100 described in the present disclosure is not limited thereto, and the structure of the communication device 5100 may not be limited by FIG. 5A . The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0638] 5B is a schematic diagram of the structure of a chip 5200 according to an embodiment of the present disclosure. If the communication device 5100 can be a chip or a chip system, reference can be made to the schematic diagram of the structure of the chip 5200 shown in FIG5B , but the present disclosure is not limited thereto.

[0639] The chip 5200 includes one or more processors 5201. The chip 5200 is configured to execute any of the above methods.

[0640] In some embodiments, chip 5200 further includes one or more interface circuits 5202. Terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 5200 further includes one or more memories 5203 for storing data. Alternatively, all or part of memory 5203 may be located external to chip 5200. Optionally, interface circuit 5202 is connected to memory 5203 and may be used to receive data from memory 5203 or other devices, or may be used to send data to memory 5203 or other devices. For example, interface circuit 5202 may read data stored in memory 5203 and send the data to processor 5201.

[0641] In some embodiments, the interface circuit 5202 performs at least one of the communication steps (e.g., steps S2100, S2102, S2105, S2107, and S2108) of the aforementioned method. The interface circuit 5202 performing the communication steps (e.g., steps S2100, S2102, S2105, S2107, and S2108) of the aforementioned method, for example, means that the interface circuit 5202 performs data exchange between the processor 5201, the chip 5200, the memory 5203, or the transceiver device. In some embodiments, the processor 5201 performs at least one of the other steps (e.g., steps S2101, S2103, S2104, S2106, and S2109, but not limited thereto).

[0642] The modules and / or devices described in various embodiments, such as virtual devices, physical devices, and chips, can be arbitrarily combined or separated according to circumstances. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0643] The present disclosure also proposes a storage medium having instructions stored thereon, which, when executed on the communication device 5100, causes the communication device 5100 to execute any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a transient storage medium.

[0644] The present disclosure also provides a program product, which, when executed by the communication device 5100, enables the communication device 5100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0645] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

[0646] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An information transmission method, characterized in that, The method is executed by a terminal and includes: Recording first information of a first cell; wherein, the first cell is the cell where the terminal camps, and the first information includes layer 1 / layer 2 triggered mobility LTM information of the first cell.

2. The method according to claim 1, wherein The recording of the first information of the first cell includes: When a first condition is satisfied, recording the first information of the first cell; Wherein, the first condition includes at least one of the following: The cell where the terminal camps changes, and the first cell is the cell where the terminal camps after the change of the camping cell; The first cell belongs to an LTM candidate cell; The terminal is configured with an LTM configuration in the first cell; The terminal performs an LTM cell handover.

3. The method according to claim 1 or 2, characterized in that, The first information includes at least one of the following: Whether the first cell is an LTM candidate cell; Whether the terminal is configured with an LTM configuration in the first cell; Whether the change of the camping cell belongs to an LTM cell handover; The first duration for which the terminal stays in the first cell.

4. The method according to any one of claims 1 to 3, characterized in that, The recording of the first information of the first cell includes: Recording the first information of the first cell into a first report variable.

5. The method according to any one of claims 1-4, characterized in that, The method further includes: Sending a first report to a first network device, the first report including the first information.

6. The method according to any one of claims 1-5, characterized in that, The method further includes at least one of the following: When a first storage space for storing the first information is full, deleting second information contained in the first storage space based on a predefined manner; When a first storage space for storing the first information is full, deleting second information contained in the first storage space based on first indication information sent by the first network device.

7. The method according to claim 6, wherein The second information contained in the first storage space satisfies at least one of the following: It is stored in the first storage space earliest; It includes the first information of at least one cell.

8. The method according to any one of claims 1 to 7, characterized in that The first cell includes at least one of the following: Primary cell PCell; Primary secondary cell PSCell.

9. The method according to any one of claims 1-8, characterized in that, The method further includes: Sending terminal capability information to the first network device, the terminal capability information being used to indicate whether the terminal has the capability to store and / or send the first information of the first cell.

10. A method for information transmission, characterized in that, The method is executed by a first network device and includes: Receiving first information sent by a terminal, the first information including layer 1 / layer 2 triggered mobility LTM information of a first cell, and the first cell is the cell where the terminal camps.

11. The method according to claim 10, characterized in that, The first information includes at least one of the following: Whether the first cell is an LTM candidate cell; Whether the terminal is configured with an LTM configuration in the first cell; Whether the change of the camping cell belongs to an LTM cell handover; The first duration for which the terminal stays in the first cell.

12. The method according to claim 10 or 11, characterized in that The receiving of the first information sent by the terminal includes: Receiving a first report sent by the terminal, the first report including the first information.

13. The method according to any one of claims 10 to 12, characterized in that, The method further includes at least one of the following: When a second storage space for storing the first information is full, deleting third information contained in the second storage space based on a predefined manner; The second storage space for storing the first information is full, and the terminal historical information UHI of the terminal is available. Discard the UHI of the terminal.

14. The method according to claim 13, wherein The third information included in the second storage space satisfies at least one of the following: Stored earliest in the second storage space; The first information including at least one cell.

15. The method according to any one of claims 10 - 14, characterized in that The method further includes: Sending first indication information to the terminal, where the first indication information is used to indicate that when the first storage space is full, delete the second information included in the first storage space; where the first storage space is the space on the terminal for storing the first information.

16. The method according to claim 15, wherein The second information included in the first storage space satisfies at least one of the following: Stored earliest in the first storage space; The first information including at least one cell.

17. The method according to any one of claims 10 - 16, characterized in that, The method further includes: Receiving second indication information sent by a second network device, where the second indication information is used to indicate the second duration that the terminal stays in a second cell. Based on the second indication information, update the total duration that the terminal stays in the second cell.

18. The method according to claim 17, wherein The updating the total duration that the terminal stays in the second cell based on the second indication information includes: Determining a third duration, where the third duration is the duration between a first time point and a second time point, the first time point is the time point when a handover request message sent by the second network device is received, and the second time point is the time point when a radio resource control RRC reconfiguration complete message sent by the terminal is received; Based on the sum value of the second duration and the third duration, update the total duration that the terminal stays in the second cell.

19. The method according to any one of claims 10-18, characterized in that, The method further includes: Sending third indication information to a second network device, where the third indication information is used for the second network device to determine whether there is an LTM handover optimization problem; where the first information is included in the third indication information.

20. The method according to any one of claims 10-19, characterized in that, The method further includes: Based on the first information, determining the existing LTM handover optimization problem. Sending fourth indication information to the second network device, where the fourth indication information is used to indicate the existing LTM handover optimization problem.

21. The method according to any one of claims 10 - 20, characterized in that, The first cell includes at least one of the following: Primary cell PCell; Primary secondary cell PSCell.

22. The method according to any one of claims 10-21, characterized in that, The method further includes: Receiving terminal capability information sent by the terminal, where the terminal capability information is used to indicate whether the terminal has the ability to store and / or send the first information of the first cell.

23. An information transmission method, characterized in that, The method is executed by a second network device and includes: Sending second indication information to a first network device, where the second indication information is used to indicate the second duration that the terminal stays in a second cell.

24. The method according to claim 23, wherein The method further includes: Receiving third indication information sent by the first network device, where the first information of a first cell is included in the third indication information; where the first cell is the cell where the terminal stays, and the first information includes the layer 1 and layer 2 triggered mobility LTM information of the first cell. Based on the third indication information, determining whether there is an LTM handover optimization problem.

25. The method according to claim 23 or 24, characterized in that The method further includes: Receive the fourth indication information sent by the first network device, where the fourth indication information is used to indicate the existing LTM handover optimization problem.

26. A terminal, characterized in that, Comprising: A processing module, configured to record the first information of the first cell; wherein, the first cell is the cell where the terminal camps, and the first information includes the mobility LTM information triggered by layer 1 and layer 2 of the first cell.

27. A first network device, characterized in that, Comprising: A transceiver module, configured to receive the first information sent by the terminal, where the first information includes the mobility LTM information triggered by layer 1 and layer 2 of the first cell, and the first cell is the cell where the terminal camps.

28. A second network device, characterized in that, Comprising: A transceiver module, configured to send second indication information to the first network device, where the second indication information is used to indicate the second duration of the terminal camping in the second cell.

29. A terminal, characterized in that, Comprising: One or more processors; Wherein, the processor is used to execute the information transmission method described in any one of claims 1-9.

30. A first network device, characterized in that, Comprising: One or more processors; Wherein, the processor is used to execute the information transmission method described in any one of claims 10-22.

31. A second network device, characterized in that, Comprising: One or more processors; Wherein, the processor is used to execute the information transmission method described in any one of claims 23-25.

32. A communication system, characterized in that, Comprising: A terminal, where the terminal is configured to implement the information transmission method described in any one of claims 1-9; A first network device, where the first network device is configured to implement the information transmission method described in any one of claims 10-22; A second network device, where the second network device is configured to implement the information transmission method described in any one of claims 23-25.

33. A storage medium storing instructions, characterized in that, When the instruction runs on the communication device, it causes the communication device to execute the information transmission method described in any one of claims 1-9, 10-22, or 23-25.

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