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: a first network device sends terminal location information to a second network device, the terminal location information being used for a terminal to perform cell handover. According to the present disclosure, terminal location information can be exchanged between network devices, thereby improving the reliability of cell handover performed by the terminal, and improving the availability of NTN communication.

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, non-terrestrial network (NTN) communications, especially satellite communications, have been included in the relevant discussions of the 3rd Generation Partnership Project (3GPP) because of their wide coverage, strong disaster resistance and large capacity.

[0003] Summary of the Invention

[0004] In order to improve the reliability of cell switching in NTN communication, 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, including:

[0006] The first network device sends terminal location information to the second network device, where the terminal location information is used by the terminal to perform cell switching.

[0007] According to a second aspect of an embodiment of the present disclosure, there is provided an information transmission method, including:

[0008] The second network device receives the terminal location information sent by the first network device, where the terminal location information is used by the terminal to perform cell switching.

[0009] According to a third aspect of an embodiment of the present disclosure, there is provided an information transmission method, including:

[0010] The terminal receives result indication information, where the result indication information is used to indicate the result of the impact of the terminal position on the signal quality;

[0011] The terminal determines, based at least on the result indication information, a target base station to be accessed or a target distribution unit of a serving base station when performing cell handover.

[0012] According to a fourth aspect of an embodiment of the present disclosure, there is provided a first network device, including:

[0013] The transceiver module is configured to send the terminal location information from the first network device to the second network device, where the terminal location information is used for the terminal to perform cell switching.

[0014] According to a fifth aspect of an embodiment of the present disclosure, a second network device is provided, including:

[0015] The transceiver module is configured to receive the terminal location information sent by the first network device as the second network device, where the terminal location information is used for the terminal to perform cell switching.

[0016] According to a sixth aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0017] a transceiver module configured to receive result indication information for the terminal, wherein the result indication information is used to indicate the result of the impact of the terminal position on the signal quality;

[0018] The processing module is configured to determine, based at least on the result indication information, a target distribution unit of a target base station or a serving base station to be accessed when performing cell handover.

[0019] According to a seventh aspect of an embodiment of the present disclosure, a network device is provided, including:

[0020] one or more processors;

[0021] The network device is used to execute the information transmission method described in any one of the first aspect or the second aspect.

[0022] According to an eighth aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0023] one or more processors;

[0024] The terminal is used to execute the method for information transmission described in any one of the third aspects.

[0025] According to a ninth aspect of an embodiment of the present disclosure, a communication system is provided, comprising a first network device, a second network device, and a terminal, wherein the first network device is configured to implement the information transmission method described in any one of the first aspect, the second network device is configured to implement the information transmission method described in any one of the second aspect, and the terminal is configured to implement the information transmission method described in any one of the third aspect.

[0026] According to the tenth 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 the information transmission method as described in any one of the first aspect, the second aspect or the third aspect.

[0027] The disclosed embodiments can exchange terminal location information between network devices, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communications.

[0028] 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

[0029] 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.

[0030] FIG1A is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0031] FIG1B is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0032] FIG1C is an exemplary schematic diagram of an NTN network architecture provided according to an embodiment of the present disclosure.

[0033] FIG1D is an exemplary interactive diagram of a conditional switching process provided according to an embodiment of the present disclosure.

[0034] FIG1E is an exemplary interactive diagram of a conditional switching process provided according to an embodiment of the present disclosure.

[0035] FIG2A is an exemplary interaction diagram of an information transmission method provided according to an embodiment of the present disclosure.

[0036] FIG2B is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0037] FIG3A is an exemplary interaction diagram of an information transmission method provided according to an embodiment of the present disclosure.

[0038] FIG3B is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0039] FIG3C is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0040] FIG4A is an exemplary interaction diagram of an information transmission method provided according to an embodiment of the present disclosure.

[0041] FIG4B is an exemplary interaction diagram of the information transmission method provided according to an embodiment of the present disclosure.

[0042] FIG5A is a schematic diagram of an exemplary interaction of an information transmission device according to an embodiment of the present disclosure.

[0043] FIG5B is a schematic diagram of an exemplary interaction of an information transmission device according to an embodiment of the present disclosure.

[0044] FIG5C is an exemplary interaction diagram of an information transmission device according to an embodiment of the present disclosure.

[0045] FIG6A is a schematic diagram of an exemplary interaction of a communication device according to an embodiment of the present disclosure.

[0046] FIG6B is an exemplary interaction diagram of a chip provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] 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.

[0048] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of at least one of the associated listed items.

[0049] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various messages, these messages should not be limited to these terms. These terms are only used to distinguish messages of the same type from each other. For example, a first message may also be referred to as a second message, and similarly, a second message may be referred to as a first message without departing from the scope of this disclosure. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0050] The embodiments of the present disclosure provide an information transmission method, an information transmission device, and a storage medium.

[0051] In a first aspect, an embodiment of the present disclosure provides an information transmission method, including:

[0052] The first network device sends terminal location information to the second network device, where the terminal location information is used by the terminal to perform cell switching.

[0053] In the above embodiment, the first network device may send the terminal location information to the second network device. The terminal location information may be used by the terminal to perform cell switching, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communication.

[0054] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0055] The first network device receives result indication information sent by the second network device, where the result indication information is used to indicate a result of an impact of the terminal position on the signal quality.

[0056] In the above embodiment, the second network device can provide result indication information to the first network device, wherein the result indication information is used to indicate the result of the impact of the terminal position on the signal quality, so that the first network device or the terminal determines, at least based on the result indication information, the target base station to be accessed or the target distribution unit of the serving base station when the terminal performs cell switching, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communication.

[0057] In combination with some embodiments of the first aspect, in some embodiments, the result indication information is used to instruct the second network device to adjust the beam parameters based on the terminal position to determine the impact result on the signal quality.

[0058] In the above embodiment, the second network device can adjust the beam parameters based on the terminal position to determine the impact of the signal quality, thereby improving the reliability of the terminal when performing cell switching.

[0059] In conjunction with some embodiments of the first aspect, in some embodiments, the beam parameter includes at least one of the following:

[0060] The pointing parameter of the beam; wherein the pointing parameter includes at least one of the following: a beam width parameter; a pointing parameter of the beam center point position;

[0061] Beam shape parameters.

[0062] In the above embodiment, the beam parameters may include but are not limited to beam pointing parameters, beam shape parameters, etc., which are easy to implement and have high usability.

[0063] In conjunction with some embodiments of the first aspect, in some embodiments, the signal includes at least one of the following:

[0064] an uplink signal from the terminal received by the second network device;

[0065] A downlink signal received by the terminal from the second network device.

[0066] In the above-mentioned embodiment, the signal in the embodiment of the present disclosure not only involves the uplink signal from the terminal received by the second network device, but also involves the downlink signal from the second network device received by the terminal, that is, the impact on the uplink and downlink signal quality is taken into account at the same time, thereby performing cell switching, improving the reliability of the terminal performing cell switching, and achieving coverage enhancement of the uplink and downlink signal quality.

[0067] In conjunction with some embodiments of the first aspect, in some embodiments, the result indication information is used to indicate any of the following:

[0068] The terminal position will not affect the signal quality;

[0069] The terminal position may affect the signal quality;

[0070] The terminal position will improve the signal quality;

[0071] The end position can reduce the signal quality.

[0072] In the above embodiment, the result indication information may be used to indicate at least one of the above items, and the reliability of the cell handover may be improved by combining the result of the impact on the signal quality when performing the cell handover.

[0073] In conjunction with some embodiments of the first aspect, in some embodiments, the first network device sending the terminal location information to the second network device includes any one of the following:

[0074] The first network device sends a handover request message to the second network device, where the handover request message includes the terminal location information;

[0075] The first network device sends a terminal context establishment request message to the second network device, where the terminal context establishment request message includes the terminal location information.

[0076] In the above embodiment, the first network device can reuse the handover request message or the terminal context establishment request message to provide the terminal location information to the second network device, which has little modification to the protocol and high availability.

[0077] In conjunction with some embodiments of the first aspect, in some embodiments, the first network device receiving the result indication information sent by the second network device includes any one of the following:

[0078] The first network device receives a handover response message sent by the second network device, where the handover response message includes the result indication information;

[0079] The first network device receives a terminal context establishment response message sent by the second network device, where the terminal context establishment response includes the result indication information.

[0080] In the above embodiment, the second network device may reuse the handover response message or the terminal context establishment response message to provide the result indication information to the first network device, which causes minor changes to the protocol and has high availability.

[0081] In combination with some embodiments of the first aspect, in some embodiments, the first network device is a source base station of the terminal, and the second network device is a candidate base station of the terminal; or

[0082] The first network device is a centralized unit of a serving base station of a terminal, and the second network device is a candidate distributed unit of the serving base station.

[0083] In the above embodiment, the information transmission method can be applied to a cell handover scenario across base stations or a cell handover scenario across distributed units, and has high availability.

[0084] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0085] The first network device determines, based at least on the result indication information, a target distribution unit of a target base station or a serving base station to be accessed by the terminal when performing cell handover.

[0086] In the above embodiment, the first network device can determine the target base station or target distribution unit of the serving base station to be accessed by the terminal when performing cell handover based at least on the result indication information, thereby improving the reliability of the terminal performing cell handover.

[0087] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0088] The first network device sends result indication information to the terminal or the source distribution unit of the serving base station of the terminal, where the result indication information is used by the terminal to determine a target base station to be accessed or a target distribution unit of the serving base station when performing cell switching.

[0089] In the above embodiment, the first network device may also send the result indication information to the terminal, or send the result indication information to the source distribution unit of the terminal's service base station, which is forwarded to the terminal by the source distribution unit, so that the terminal determines the target base station to be accessed or the target distribution unit of the service base station when performing cell switching based on at least the result indication information, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communication.

[0090] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes any one of the following:

[0091] The first network device receives the terminal location information reported by the terminal;

[0092] The first network device receives the terminal location information forwarded by a source distribution unit of a serving base station of the terminal, where the terminal location information is reported by the terminal to the source distribution unit.

[0093] In the above embodiment, the first network device may obtain the terminal location information from the terminal or the source distribution unit of the terminal's serving base station, and provide the information to the second network device, which is simple to implement and has high availability.

[0094] In a second aspect, an embodiment of the present disclosure provides an information transmission method, including:

[0095] The second network device receives the terminal location information sent by the first network device, where the terminal location information is used by the terminal to perform cell switching.

[0096] In the above embodiment, the second network device can obtain the terminal location information from the first network device. The terminal location information is used for the terminal to perform cell switching, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communication.

[0097] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0098] The second network device adjusts the beam parameters based on the terminal position.

[0099] In the above embodiment, the second network device can adjust beam parameters based on the terminal's location to determine the impact on signal quality, thereby assisting the terminal or the first network device in determining the target base station or target distribution unit of the serving base station to be connected when the terminal performs a cell handover. This improves the reliability of the terminal performing cell handover and enhances the availability of NTN communications.

[0100] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0101] Result indication information is sent to the first network device, where the result indication information is used to indicate the result of the impact of the terminal position on the signal quality.

[0102] In combination with some embodiments of the second aspect, in some embodiments, the result indication information is used to instruct the second network device to adjust the beam parameters based on the terminal position to determine the impact result on the signal quality.

[0103] In conjunction with some embodiments of the second aspect, in some embodiments, the beam parameter includes at least one of the following:

[0104] The pointing parameter of the beam; wherein the pointing parameter includes at least one of the following: a beam width parameter; a pointing parameter of the beam center point position;

[0105] Beam shape parameters.

[0106] In conjunction with some embodiments of the second aspect, in some embodiments, the signal includes at least one of the following:

[0107] an uplink signal from the terminal received by the second network device;

[0108] A downlink signal received by the terminal from the second network device.

[0109] In conjunction with some embodiments of the second aspect, in some embodiments, the result indication information is used to indicate any of the following:

[0110] The terminal position will not affect the signal quality;

[0111] The terminal position may affect the signal quality;

[0112] The terminal position will improve the signal quality;

[0113] The end position can reduce the signal quality.

[0114] In conjunction with some embodiments of the second aspect, in some embodiments, the second network device receiving the terminal location information sent by the first network device includes any of the following:

[0115] The second network device receives a handover request message sent by the first network device, where the handover request message includes the terminal location information;

[0116] The second network device receives a terminal context establishment request message sent by the first network device, where the terminal context establishment request message includes the terminal location information.

[0117] In conjunction with some embodiments of the second aspect, in some embodiments, the second network device sending result indication information to the first network device includes any one of the following:

[0118] The second network device sends a handover response message to the first network device, where the handover response message includes the result indication information;

[0119] The second network device sends a terminal context establishment response message to the first network device, where the terminal context establishment response includes the result indication information.

[0120] In combination with some embodiments of the second aspect, in some embodiments, the first network device is a source base station of the terminal, and the second network device is a candidate base station of the terminal; or

[0121] The first network device is a centralized unit of a serving base station of a terminal, and the second network device is a candidate distributed unit of the serving base station.

[0122] In a third aspect, an embodiment of the present disclosure provides an information transmission method, including:

[0123] The terminal receives result indication information, where the result indication information is used to indicate the result of the impact of the terminal position on the signal quality;

[0124] The terminal determines, based at least on the result indication information, a target base station to be accessed or a target distribution unit of a serving base station when performing cell handover.

[0125] In the above embodiment, the terminal can determine, based at least on the received result indication information, the target base station or target distribution unit of the serving base station to be connected when performing cell handover. This improves the reliability of the terminal performing cell handover, achieves coverage enhancement of uplink and downlink signal quality, and improves the availability of NTN communications.

[0126] In combination with some embodiments of the third aspect, in some embodiments, the result indication information is used to instruct the second network device to adjust the beam parameters based on the terminal position to determine the impact result on the signal quality.

[0127] In conjunction with some embodiments of the third aspect, in some embodiments, the beam parameter includes at least one of the following:

[0128] The pointing parameter of the beam; wherein the pointing parameter includes at least one of the following: a beam width parameter; a pointing parameter of the beam center point position;

[0129] Beam shape parameters.

[0130] In conjunction with some embodiments of the third aspect, in some embodiments, the signal includes at least one of the following:

[0131] an uplink signal from the terminal received by the second network device;

[0132] A downlink signal received by the terminal from the second network device.

[0133] In conjunction with some embodiments of the third aspect, in some embodiments, the result indication information is used to indicate any of the following:

[0134] The terminal position will not affect the signal quality;

[0135] The terminal position may affect the signal quality;

[0136] The terminal position will improve the signal quality;

[0137] The end position can reduce the signal quality.

[0138] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes any one of the following:

[0139] The terminal reports the terminal location information to the source base station; or

[0140] The terminal reports the terminal location information to the source distribution unit of the serving base station, so that the source distribution unit forwards the terminal location information to the centralization unit of the serving base station.

[0141] In conjunction with some embodiments of the third aspect, in some embodiments, the second network device is a candidate base station; or

[0142] The second network device is a candidate distribution unit of the serving base station.

[0143] In a fourth aspect, an embodiment of the present disclosure provides a first network device, including:

[0144] The transceiver module is configured to send the terminal location information from the first network device to the second network device, where the terminal location information is used for the terminal to perform cell switching.

[0145] In a fifth aspect, an embodiment of the present disclosure provides a second network device, including:

[0146] The transceiver module is configured to receive the terminal location information sent by the first network device as the second network device, where the terminal location information is used for the terminal to perform cell switching.

[0147] In a sixth aspect, an embodiment of the present disclosure provides a terminal, including:

[0148] a transceiver module configured to receive result indication information for the terminal, wherein the result indication information is used to indicate the result of the impact of the terminal position on the signal quality;

[0149] The processing module is configured to determine, based at least on the result indication information, a target distribution unit of a target base station or a serving base station to be accessed when performing cell handover.

[0150] In a seventh aspect, an embodiment of the present disclosure provides a network device, including:

[0151] one or more processors;

[0152] The network device is used to execute the information transmission method described in any one of the first aspect or the second aspect.

[0153] In an eighth aspect, an embodiment of the present disclosure provides a terminal, including:

[0154] one or more processors;

[0155] The terminal is used to execute the method for information transmission described in any one of the third aspects.

[0156] In the ninth aspect, an embodiment of the present disclosure proposes a communication system, comprising a first network device, a second network device, and a terminal, wherein the first network device is configured to implement the information transmission method described in any one of the first aspect, the second network device is configured to implement the information transmission method described in any one of the second aspect, and the terminal is configured to implement the information transmission method described in any one of the third aspect.

[0157] In a tenth aspect, an embodiment of the present disclosure proposes a storage medium storing 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 aspect, the second aspect or the third aspect.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0164] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0165] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0171] 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.

[0172] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0173] 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.

[0174] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc.

[0175] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0176] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0177] 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.

[0178] 1A and 1B are schematic diagrams of the architecture of a communication system according to an embodiment of the present disclosure.

[0179] As shown in FIG1A , a communication system 100 - 1 includes a terminal 101 , a first network device 102 - 1 , and a second network device 103 - 1 .

[0180] 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.

[0181] In some embodiments, the first network device 102-1 or the second network device 103-1 includes an access network device, such as 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.

[0182] 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.

[0183] In some embodiments, in an inter-gNB handover scenario, first network device 102-1 may be the source base station for terminal 101, and second network device 103-1 may be a candidate base station for handover by terminal 101. A candidate base station refers to a base station determined by the terminal to be handoverable when performing a cell handover.

[0184] As shown in FIG1B , a communication system 100 - 2 includes a terminal 101 , a first network device 102 - 2 , and a second network device 103 - 2 .

[0185] 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.

[0186] In some embodiments, in an inter-distributed unit (inter-DU) or intra-gNB handover scenario, the first network device 102-2 may be the central unit (CU) of the terminal 101, and the second network device 103-2 may be a candidate distributed unit during handover of the terminal 101. The candidate distributed unit, the central unit, and the source distributed unit of the terminal 101 all belong to the serving base station of the terminal 101. The candidate distributed unit refers to a distributed unit in the serving base station that the terminal determines can be handed over to when performing a cell handover.

[0187] The CU-DU structure can split the protocol layer of the access network device. The functions of some protocol layers are centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers are distributed in the DU, which is centrally controlled by the CU, but not limited to this.

[0188] In some embodiments, the communication system 100-1 or 100-2 further includes a core network device (not shown in FIG. 1A or FIG. 1B ). The core network device may be a single device, 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), and a Next Generation Core (NGC).

[0189] 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.

[0190] The following embodiments of the present disclosure may be applied to the communication system 100-1 shown in FIG1A or the communication system 100-2 shown in FIG1B , or a portion of the subject, but are not limited thereto. The subjects shown in FIG1A or FIG1B are examples. The communication system may include all or part of the subjects in FIG1A or FIG1B , or may include other subjects other than those in FIG1A or FIG1B . The number and form of the subjects are arbitrary. The subjects may be physical or virtual. The connection relationship between the subjects is an example. The subjects may be connected or disconnected. The connection may be in any manner, directly or indirectly, and wired or wireless.

[0191] The embodiments of the present disclosure can 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), 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.

[0192] NTN scenarios include those based on geostationary Earth Orbiting (GEO) satellites and those based on non-geostationary Earth Orbiting (NGSO) satellites. The specific architecture of the NTN network is shown in Figure 1C, where the link between the terminal and the satellite is the service link, and the link between the satellite and the NTN gateway is the feeder link.

[0193] Currently, NTN networks exist in two types: transparent and regenerative architectures. Transparent architectures involve satellites providing transparent forwarding, meaning communications between base stations and users are forwarded via satellite. The NTN gateway and base station are generally assumed to be close enough to be considered co-located. Regenerative architectures involve a portion of the base station (DU) or the entire base station being located on the satellite, which also provides data processing capabilities. However, due to the high orbital altitude of satellites, the path loss between terminals and base stations is significant. Simulations in Release-18 (Rel-18) revealed the need for coverage enhancement for uplink channels, such as the Physical Uplink Shared Channel (PUSCH) and the Physical Uplink Control Channel (PUCCH), particularly for the PUSCH used for Voice over Internet Protocol (VoIP) and the PUCCH used for Message 4 Hybrid Automatic Repeat Request-ACKnowledgement (Msg4HARQ-ACK).

[0194] The regenerative satellite architecture can be categorized into two types: one in which all base station functions reside on the satellite, and one in which the DU functions reside on the satellite (with the CU and DU separated). To address this, the disclosed embodiments provide inter-gNB (inter-gNB) and inter-DU (inter-DU) handover procedures. Inter-DU cell handover is also referred to as intra-gNB cell handover.

[0195] As shown in FIG1D , the inter-gNB Conditional Handover (CHO) process includes the following steps:

[0196] In step S1400, the terminal context in the source base station includes information about roaming and access restrictions, which is provided by the core network equipment, such as the Authentication Management Function (AMF), when the connection is established or the last Tracking Area (TA) is updated.

[0197] Step S1401: The source base station configures the terminal measurement process, and the terminal reports according to the measurement configuration.

[0198] Step S1402: The source base station determines, based on the measurement report (MeasurementReport) reported by the terminal, that the terminal needs to perform cell handover.

[0199] Step S1403: The source base station sends a handover request message to one or more candidate base stations.

[0200] Step S1404: Admission control may be performed by the candidate base station.

[0201] If slice information is sent to a candidate base station, slice-aware admission control should be performed. If a Protocol Data Unit (PDU) session is associated with an unsupported slice, the candidate base station should reject such a PDU session.

[0202] Step S1405: The candidate base station sends a handover response message including the candidate cell configuration to the source base station.

[0203] Step S1406: The source base station sends an RRCReconfiguration message to the terminal.

[0204] The RRCReconfiguration message may include the configuration of the candidate cell and the conditional handover execution condition. The configuration of the candidate cell may be reconfigured along with other information of the source base station.

[0205] Step S1407: The terminal sends an RRCReconfigurationComplete message to the source base station.

[0206] Step S1407 - a : If early data forwarding is applied, the source base station may send an EARLY STATUS TRANSFER message to the candidate base station.

[0207] In step S1408, after receiving the above configuration, the terminal maintains its connection with the source base station and begins evaluating the CHO execution conditions of candidate cells. If at least one candidate cell meets the corresponding CHO execution condition, the terminal disconnects from the source base station, applies the stored configuration to the selected candidate cell, and synchronizes to the candidate cell. The terminal releases the stored CHO configuration after successfully completing the RRC handover process.

[0208] Step S1408 - a : The target base station sends a HANDOVER SUCCESS message to the source base station, notifying the source base station that the terminal has successfully accessed the target base station.

[0209] In step S1408-b, the source base station sends a Sequence Number STATUS TRANSFER (SN STATUS TRANSFER) message to the target base station in return.

[0210] Step S1408-c: The source base station sends a HANDOVER CANCEL message to other candidate base stations (if there are other candidate base stations) to cancel the CHO of the terminal.

[0211] 1E , the inter-distribution unit (inter-DU) CHO process includes the following steps:

[0212] Step S1501: The terminal sends a measurement report to the source distribution unit.

[0213] Step S1502: The source distribution unit sends an uplink radio resource control message transfer (UL RRC MESSAGE TRANSFER) message to the centralized unit to convey the received MeasurementReport.

[0214] Step S1503: The centralized unit sends a UE CONTEXT SETUP REQUEST message to the candidate distributed unit.

[0215] This message is used to create a terminal context and set up one or more data bearers.

[0216] The UE CONTEXT SETUP REQUEST message sends conditional mobility information across DUs for each candidate distribution unit, and includes handover preparation information (HandoverPreparationInformation) for conditional handover or semi-static configuration information for changing conditional primary and secondary cells.

[0217] Step S1504: The candidate distribution unit responds using a UE CONTEXT SETUP RESPONSE message.

[0218] The UE CONTEXT SETUP RESPONSE message includes the target cell identifier requested from the centralized unit.

[0219] Step S1505: The centralized unit sends a downlink radio resource control message transfer (DL RRC MESSAGE TRANSFER) message to the source distributed unit.

[0220] This message includes the generated RRCReconfiguration message.

[0221] Step S1506: The source distribution unit forwards the received RRCReconfiguration message to the terminal.

[0222] Step S1507: The terminal responds to the source distribution unit with an RRCReconfigurationComplete message.

[0223] Step S1508: The source distributed unit forwards the RRCReconfigurationComplete message to the centralized unit via a UL RRC MESSAGE TRANSFER message.

[0224] Step S1509: the execution condition for triggering conditional switching or CHO is met.

[0225] Step S1510: A random access process is performed between the terminal and the target distribution unit.

[0226] Step S1511: The terminal sends an RRCReconfigurationComplete message to the target distributed unit.

[0227] Step S1512: The target distributed unit sends a UL RRC MESSAGE TRANSFER message to the centralized unit.

[0228] This message includes the RRCReconfigurationComplete message.

[0229] Step S1513: The centralized unit sends a UE CONTEXT MODIFICATION REQUEST message to the source distributed unit, instructing the terminal to stop data transmission.

[0230] The source distribution unit also sends a downlink data transmission status frame to notify the centralized unit that the downlink data has not been successfully transmitted to the terminal.

[0231] Step S1514: The source distributed unit responds to the centralized unit with a UE CONTEXT MODIFICATION RESPONSE message.

[0232] Step S1515: The centralized unit sends a UE CONTEXT RELEASE COMMAND message to the source distributed unit.

[0233] Step S1516: The source distributed unit releases the terminal context and responds to the centralized unit with a UE CONTEXT RELEASE COMPLETE message.

[0234] By adjusting the parameters of the satellite beam, such as the direction of the satellite beam (3dB beam width and the directivity of the satellite beam center point position), the shape of the satellite beam and other beam parameters, the satellite's reception quality of the UL signal can be changed. For regenerative satellites, if the satellite has a phased array antenna, the satellite can change the parameters of the satellite beam through algorithms to enhance the reception strength of the UL signal of the service users within the coverage area.

[0235] During cell handover, candidate base stations or candidate distributed units do not know the location of the terminal to be connected, and therefore cannot ensure the reliability of the target base station or distributed unit to which the terminal is connected. Furthermore, the signal quality of the target base station or distributed unit to which the terminal is connected cannot be determined, and thus, uplink and downlink signal quality coverage enhancement cannot be achieved.

[0236] FIG2A is a schematic diagram illustrating an information transmission method according to an embodiment of the present disclosure. As shown in FIG2A , the present disclosure relates to an information transmission method applicable to an inter-gNB cell handover scenario, including:

[0237] In step S2101, the terminal 101 reports the terminal location information to the first network device 102-1.

[0238] In some embodiments, the first network device 102 - 1 receives the terminal location information.

[0239] In some embodiments, the first network device 102-1 is a source base station of the terminal 101. The source base station is a serving base station of the terminal 101 before the terminal 101 performs a cell handover.

[0240] In some embodiments, the name of the terminal location information is not limited, and it can be, for example, a location message, a first message, a first signaling, etc.

[0241] In some embodiments, the terminal location information is used by the terminal 101 to perform cell switching.

[0242] In some embodiments, the terminal location information is information related to the location of the terminal 101.

[0243] In some embodiments, the terminal location information includes, but is not limited to, at least one of the following: at least one of the longitude and latitude information of the terminal 101; Global Navigation Satellite System (GNSS) information of the terminal 101; and identification information of the cell where the terminal 101 is located. The cell identification may be a physical cell identifier (PCI), etc.

[0244] In some embodiments, the terminal 101 may periodically report the terminal location information to the first network device 102 - 1 .

[0245] In some embodiments, the terminal 101 may report the terminal location information to the first network device 102 - 1 based on instructions from the network side.

[0246] In some embodiments, the terminal 101 may report the terminal location information to the first network device 102 - 1 when the signal quality of the serving cell degrades.

[0247] In some embodiments, the terminal 101 may report a measurement report to the first network device 102 - 1 , including the terminal location information.

[0248] In step S2102, the first network device 102-1 sends the terminal location information to the second network device 103-1.

[0249] In some embodiments, the second network device 103 - 1 receives terminal location information.

[0250] In some embodiments, the second network device 103 - 1 may be a candidate base station when the terminal 101 switches.

[0251] In some embodiments, the number of the second network device 103 - 1 may be one or more, which is not limited in this disclosure.

[0252] In some embodiments, the first network device 102 - 1 may send the terminal location information to the second network device 103 - 1 through an inter-network interface between the first network device 102 - 1 and the second network device 103 - 1 .

[0253] The inter-network interface includes but is not limited to an X2 interface or an Xn interface.

[0254] In some embodiments, the first network device 102 - 1 may send the terminal location information to a core network device, and the core network device may forward the terminal location information to the second network device 103 - 1 .

[0255] In some embodiments, the first network device 102-1 sends a handover request (HANDOVER REQUEST) message to the second network device 103-1. The handover request message is used to request to perform cell handover, and the handover request message may include terminal location information.

[0256] The terminal location information is provided to the second network device 103 - 1 through the handover request message, so that the second network device 103 - 1 determines the terminal location information for the terminal to perform cell handover.

[0257] In step S2103 , the second network device 103 - 1 adjusts beam parameters based on the terminal position.

[0258] In some embodiments, the names of the beam parameters are not limited.

[0259] In some embodiments, the beam parameters include but are not limited to at least one of the following: a pointing parameter of the beam; and a shape parameter of the beam.

[0260] In one example, the pointing parameter of the beam may be used to characterize the direction of the beam.

[0261] In an example, the pointing parameter of the beam includes but is not limited to at least one of the following: a beam width parameter; and a pointing parameter of a beam center point position.

[0262] Exemplarily, the beam width parameter can be used to characterize the beam bandwidth, where the beam bandwidth can be narrow bandwidth or wide bandwidth. It should be noted that the narrow bandwidth or wide bandwidth here are relative concepts, and the present disclosure does not limit the specific bandwidth.

[0263] Exemplarily, the pointing parameter of the beam center point position may be used to characterize the direction of the beam center point.

[0264] In one example, the shape parameters of the beam may be used to characterize the beamforming result.

[0265] Exemplarily, the shape parameters of the beam may include, but are not limited to, the antenna or antenna array used when transmitting the beam, the amplitude of the beam, the phase of the beam, and the like.

[0266] In some embodiments, the second network device 103 - 1 may adjust the pointing parameters of the beam based on the terminal location so that the beam direction is better aligned with the terminal location.

[0267] Exemplarily, the second network device 103 - 1 may adjust a beam width parameter based on the terminal position, for example, adjusting the beam width to a wide bandwidth or a narrow bandwidth.

[0268] Exemplarily, the second network device 103 - 1 may adjust the directional parameter of the beam center point position based on the terminal position, so that the direction pointed by the directional parameter of the beam center point position is aligned with the terminal position.

[0269] In some embodiments, the second network device 103 - 1 may adjust the shape parameters of the beam based on the terminal position to perform more accurate and reliable beamforming for the terminal 101 .

[0270] In some embodiments, the second network device 103 - 1 may adjust the pointing parameters and shape parameters of the beam based on the terminal position. The specific adjustment method is similar to the above process and will not be repeated here.

[0271] In some embodiments, a solution in which the second network device 103 - 1 adjusts other beam parameters based on the terminal position should also fall within the scope of protection of the present disclosure.

[0272] Step S2104: The second network device 103-1 sends result indication information to the first network device 102-1.

[0273] In some embodiments, the first network device 102 - 1 receives result indication information.

[0274] In some embodiments, the name of the result indication information is not limited, and it can be, for example, an indication message, indication information, a first message, a first signaling, etc.

[0275] In some embodiments, the result indication information is used to indicate the result of the impact of the terminal position on the signal quality.

[0276] In some embodiments, the result indication information is used to instruct the second network device 103-1 to adjust the beam parameters based on the terminal position to determine the impact result on the signal quality.

[0277] In some embodiments, the above-mentioned signal includes but is not limited to at least one of the following: an uplink signal from the terminal 101 received by the second network device 103 - 1 ; a downlink signal from the second network device 103 - 1 received by the terminal 101 .

[0278] In some embodiments, the result indication information is used to indicate, but is not limited to, any of the following: the terminal position will not affect the signal quality; the terminal position will affect the signal quality; the terminal position will improve the signal quality; the terminal position will reduce the signal quality.

[0279] Exemplarily, the result indication information is used to indicate that the terminal position will not affect the signal quality, for example, whether the second network device 103-1 adjusts the beam parameters based on the terminal position will not affect the uplink signal quality and / or will not affect the downlink signal quality.

[0280] Exemplarily, the result indication information is used to indicate that the terminal position will affect the signal quality. For example, the second network device 103 - 1 adjusts the beam parameters based on the terminal position, which may affect the uplink signal quality and / or the downlink signal quality.

[0281] Exemplarily, the result indication information is used to indicate that the terminal position will improve signal quality, for example, the second network device 103 - 1 will improve uplink signal quality and / or downlink signal quality after adjusting beam parameters based on the terminal position.

[0282] Exemplarily, the result indication information is used to indicate that the terminal position will reduce signal quality, for example, after the second network device 103-1 adjusts the beam parameters based on the terminal position, the uplink signal quality and / or the downlink signal quality will be reduced.

[0283] Exemplarily, the result indication information is used to indicate one, two, or more of the following: the terminal location will not affect signal quality, will affect signal quality, will improve signal quality, or will reduce signal quality.

[0284] For example, whether the second network device 103 - 1 adjusts the beam parameters based on the terminal position will not affect the uplink signal quality, but adjusting the beam parameters will affect the downlink signal quality.

[0285] For another example, whether the second network device 103 - 1 adjusts the beam parameters based on the terminal position will not affect the uplink signal quality, but if the beam parameters are adjusted, the downlink signal quality will be affected and the downlink signal quality will be reduced.

[0286] In some embodiments, the second network device 103 - 1 may estimate the change value of the signal quality before and after adjusting the beam parameters based on its own implementation, and accordingly, the result indication information may include the change value.

[0287] For example, the sign of the change value can be used to represent an improvement or decrease in signal quality, and the absolute value of the change value is used to represent the amount of change in signal quality.

[0288] For example, the change value may be in decibels per milliwatt (dbm).

[0289] For example, the second network device 103 - 1 estimates that the signal quality is improved after adjusting the beam parameters, and the improvement is expected to be 10 dBm, then the result indication information may be used to indicate +10.

[0290] For another example, the second network device 103 - 1 estimates that the signal quality is reduced after adjusting the beam parameters, and is expected to be improved by 5 dBm, then the result indication information may be used to indicate -5.

[0291] The above description is merely an exemplary description, and other contents indicated by the result indication information should also fall within the scope of protection of this disclosure.

[0292] In some embodiments, the second network device 103 - 1 may estimate the impact on the signal quality after adjusting the beam parameters based on the terminal position, and then send the result indication information to the first network device 102 - 1 .

[0293] In some embodiments, the second network device 103-1 sends the result indication information to the first network device 102-1 via an inter-network interface, which includes but is not limited to an X2 interface and an Xn interface.

[0294] In some embodiments, the second network device 103 - 1 sends result indication information to the core network device, and the core network device forwards the result indication information to the first network device 102 - 1 .

[0295] In some embodiments, the first network device 102-1 sends a handover request message to the second network device 103-1, which includes the terminal location information. Accordingly, the second network device 103-1 can send a handover response (HANDOVER REQUEST ACKNOWLEDGE) message to the first network device 102-1, and the handover response message includes the result indication information.

[0296] In some embodiments, when the bit value of the information element (Information Element, IE) where the result indication information is located is set to a first value, it is used to indicate that the terminal position will not affect the signal quality; when it is set to a second value, it is used to indicate that the terminal position will affect the signal quality.

[0297] The first value may be "0" and the second value may be "1".

[0298] The first value may be "1" and the second value may be "0".

[0299] In some embodiments, when the bit value of the IE where the result indication information is located is set to the third value, it is used to indicate that the terminal position will improve the signal quality; when it is set to the fourth value, it is used to indicate that the terminal position will reduce the signal quality.

[0300] The third value may be “0” and the fourth value may be “1”.

[0301] The third value may be "1" and the fourth value may be "0".

[0302] In some embodiments, the IE where the result indication information is located includes at least two bits, which are used to indicate whether the terminal position will affect the signal quality and whether the terminal position will improve or reduce the signal quality.

[0303] For example, the bit value of the IE is "01" or "00", which is used to indicate that the terminal position will not affect the signal quality.

[0304] For another example, the bit value of the IE is "11", which indicates that the terminal position affects the signal quality and the terminal position improves the signal quality. The bit value of the IE is "10", which indicates that the terminal position affects the signal quality and the terminal position reduces the signal quality.

[0305] In some embodiments, the IE containing the result indication information includes at least two bits, which are used to indicate whether the terminal position will affect the uplink signal quality and whether it will affect the downlink signal quality.

[0306] For example, the bit value of the IE is "01", which is used to indicate that the terminal position will not affect the uplink signal quality, but will affect the downlink signal quality.

[0307] For another example, the bit value of the IE is "00", which is used to indicate that the terminal position will not affect the uplink signal quality and will not affect the downlink signal quality.

[0308] In some embodiments, the IE containing the result indication information includes at least four bits, which are used to indicate whether the terminal position affects the uplink signal quality, will improve or reduce the uplink signal quality, whether it affects the downlink signal quality, will improve or reduce the downlink signal quality.

[0309] For example, the bit value of the IE is "0101", which is used to indicate that the terminal position will not affect the uplink signal quality, and the terminal position will not affect the downlink signal quality.

[0310] For another example, the bit value of the IE is "1110", which indicates that the terminal position will affect the uplink signal quality, the terminal position will improve the uplink signal quality, the terminal position will affect the downlink signal quality, and the terminal position will reduce the downlink signal quality.

[0311] In some embodiments, the handover response message includes an IE containing result indication information, which is used to indicate that the terminal location affects the signal quality; if the IE is not included, it is used to indicate that the terminal location does not affect the signal quality.

[0312] The above description is merely an example, and all indication methods of the result indication information should fall within the scope of protection of this disclosure.

[0313] Step S2105: The first network device 102-1 determines, based at least on the result indication information, a target base station to be accessed when the terminal 101 performs cell handover.

[0314] In some embodiments, the target base station is one of the candidate base stations, ie, the second network device 103 - 1 , and the target base station is a base station to be accessed when the terminal performs cell handover.

[0315] In some embodiments, the first network device 102 - 1 determines a target base station based on the result indication information.

[0316] Exemplarily, the first network device 102-1 uses the result indication information to determine a second network device 103-1 as a target base station, indicating that the terminal location will not affect the signal quality.

[0317] Exemplarily, the first network device 102-1 uses the result indication information to indicate that a second network device 103-1, whose terminal location may affect signal quality, is determined as a target base station.

[0318] Exemplarily, the first network device 102-1 uses the result indication information to indicate that the terminal position will improve the signal quality of a second network device 103-1 and determines it as a target base station.

[0319] Exemplarily, the first network device 102-1 uses the result indication information to indicate that the terminal position will affect the signal quality and a second network device 103-1 that will improve the signal quality is determined as the target base station.

[0320] Exemplarily, the first network device 102-1 uses the result indication information to indicate that the terminal position will affect the uplink signal quality (eg, will improve or reduce the uplink signal quality) and determines a second network device 103-1 that will improve the downlink signal quality as the target base station.

[0321] Exemplarily, the first network device 102-1 uses the result indication information to indicate that a second network device 103-1, whose terminal position will not affect the uplink signal quality but will improve the downlink signal quality, is determined as the target base station.

[0322] That is, the first network device 102-1 determines a second network device 103-1 capable of achieving downlink coverage enhancement as a target base station.

[0323] Exemplarily, the first network device 102-1 uses the result indication information to determine a second network device 103-1 as the target base station, indicating that the terminal position will improve the uplink signal quality and affect the downlink signal quality (eg, will improve or reduce the downlink signal quality).

[0324] Exemplarily, the first network device 102-1 uses the result indication information to indicate that the terminal position will improve the uplink signal quality and will not affect the downlink signal quality, and determines a second network device 103-1 as the target base station.

[0325] That is, the first network device 102-1 determines a second network device 103-1 capable of achieving uplink coverage enhancement as a target base station.

[0326] Exemplarily, the first network device 102-1 uses the result indication information to indicate that the terminal position will improve the uplink signal quality and the downlink signal quality, and determines a second network device 103-1 as the target base station.

[0327] That is, the first network device 102-1 determines a second network device 103-1 that can achieve uplink coverage enhancement and downlink coverage enhancement as a target base station.

[0328] The above description is merely an exemplary description, and other solutions in which the first network device 102 - 1 determines the target base station based on the result indication information should also fall within the protection scope of the present disclosure.

[0329] In some embodiments, the first network device 102 - 1 determines the target base station based on the result indication information and other information.

[0330] In an example, other information includes but is not limited to a measurement report reported by the terminal.

[0331] Exemplarily, the first network device 102 - 1 determines the target base station based on the measurement report and the result indication information.

[0332] For example, the first network device 102-1 first determines the second network device 103-1 whose terminal position will improve signal quality based on the result indication information, and then selects the second network device 103-1 with the best signal quality among these second network devices 103-1 as the target base station.

[0333] Exemplarily, the first network device 102-1 first screens out second network devices 103-1 whose signal quality is higher than a preset threshold, and then selects a second network device 103-1 among these second network devices 103-1 as the target base station, which will improve the signal quality at the terminal position.

[0334] In some embodiments, after determining the target base station, the first network device 102 - 1 may control the terminal 101 to switch to the target base station.

[0335] Step S2106 : The first network device 102 - 1 sends result indication information to the terminal 101 .

[0336] In some embodiments, terminal 101 receives the result indication information.

[0337] In some embodiments, there are multiple result indication information, and the first network device 102 - 1 sends the result indication information and the identifier of the second network device 103 - 1 corresponding to each result indication information to the terminal 101 .

[0338] In some embodiments, the first network device 102 - 1 may send the result indication information to the terminal 101 via a Radio Resource Control (RRC) message.

[0339] In some embodiments, the first network device 102 - 1 may send a radio resource control reconfiguration (RRCReconfiguration) message to the terminal 101 , which includes result indication information.

[0340] In some embodiments, after receiving the RRCReconfiguration message, the terminal 101 may send a radio resource control reconfiguration complete (RRCReconfigurationComplete) message to the first network device 102-1 to inform the first network device 102-1 that the terminal 101 has synchronously updated the RRC-related configuration.

[0341] In some embodiments, the indication method of the result indication information is similar to the indication method in step S2104 and will not be repeated here.

[0342] Exemplarily, the RRCReconfiguration message includes the IE where the result indication information is located, which is used to indicate that there is an impact on the signal quality, and is used to indicate that there is no impact on the signal quality.

[0343] Step S2107: The terminal 101 determines a target base station to be accessed when performing cell switching based at least on the result indication information.

[0344] In some embodiments, the terminal 101 may determine the target base station based on the result indication information.

[0345] In some embodiments, the terminal 101 may determine the target base station based on the result indication information and other conditions for performing conditional switching.

[0346] The solution for the terminal 101 to determine the target base station based at least on the result indication information is similar to the solution for the first network device 102 - 1 to determine the target base station, and will not be described in detail here.

[0347] In some embodiments, after determining the target base station, the terminal 101 may access the target base station, and may disconnect from the first network device 102 - 1 before or after accessing the target base station.

[0348] 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.

[0349] In some embodiments, the terms "uplink", "uplink", "physical uplink", etc. can be used interchangeably.

[0350] In some embodiments, terms such as “send”, “transmit”, “report”, “send”, “transmit”, “bidirectional transmission”, “send and / or receive” and the like can be used interchangeably.

[0351] 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.

[0352] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0353] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" 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.

[0354] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2107. For example, step S2101 can be implemented as an independent embodiment, step S2102 can be implemented as an independent embodiment, steps S2102 + S2103 can be implemented as an independent embodiment, steps S2101 to S2103 can be implemented as independent embodiments, step S2104 can be implemented as an independent embodiment, step S2105 can be implemented as an independent embodiment, steps S2106 + step S2107 can be implemented as independent embodiments, steps S2104 + step S2105 can be implemented as independent embodiments, and steps S2104 + step S2106 + step S2107 can be implemented as independent embodiments, but are not limited thereto.

[0355] In some embodiments, step S2101 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0356] In some embodiments, step S2103 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0357] In some embodiments, steps S2104 to S2107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0358] In some embodiments, either step S2105 or step S2106+step S2107 may be performed selectively. For example, step S2105 corresponds to the source base station controlling the terminal to perform cell handover, while step S2106+step S2107 corresponds to CHO on the terminal side. Exemplarily, step S2105 may be performed, while steps S2106+step S2107 are not performed. In this case, the first network device 102-1 may determine a target base station for the terminal 101 to access during cell handover.

[0359] Exemplarily, step S2106 + step S2107 may be performed without performing step S2105, and the terminal 101 may determine the target base station to be accessed during cell switching.

[0360] The impact result of the signal quality may be used as a new CHO switching condition event, and the terminal 101 needs to consider the impact result when executing CHO.

[0361] The existing CHO switching condition event may be reused, and the terminal 101 also needs to consider the impact result when executing CHO.

[0362] Exemplarily, the existing CHO switching condition event may be a reference signal receiving power (RSRP). The terminal 101 calculates a new RSRP for each cell based on the change value indicated in the result indication information and the RSRP of the cell in the measurement report, and determines to perform CHO based on the new RSRP.

[0363] Among them, the present disclosure does not limit the method of calculating the new RSRP. The average of RSRP and the change value can be calculated, or different weights can be assigned to RSRP and the change value according to business requirements to calculate the weighted average, or other methods can be used to calculate the new RSRP.

[0364] In some embodiments, steps S2101 to S2107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0365] In the above embodiment, the source base station can send the terminal location information to the candidate base station. The candidate base station can adjust the beam parameters based on the terminal location and provide the result indication information to the source base station. The result indication information is used to indicate the result of the impact of the terminal location on the signal quality. Then, the source base station or the terminal determines the target base station to be accessed when the terminal performs cell switching based on at least the result indication information, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communication.

[0366] Figure 2B is an interactive diagram illustrating an information transmission method according to an embodiment of the present disclosure. As shown in Figure 2B , the present disclosure relates to an information transmission method applicable to inter-distributed unit (inter-DU) or intra-gNB cell handover scenarios, and the method includes:

[0367] Step S2201: Terminal 101 reports terminal location information to a source distribution unit of a serving base station.

[0368] In some embodiments, the source distribution unit receives the terminal location information.

[0369] In some embodiments, the source distribution unit is a distribution unit of the serving base station accessed by the terminal before performing cell switching.

[0370] In some embodiments, the name of the terminal location information is not limited, and it can be, for example, a location message, a first message, a first signaling, etc.

[0371] In some embodiments, the terminal location information is used by the terminal 101 to perform cell switching.

[0372] In some embodiments, the terminal location information is information related to the location of the terminal 101.

[0373] In some embodiments, the terminal location information includes but is not limited to at least one of the following: at least one of the longitude and latitude information of the terminal 101; GNSS information of the terminal 101; and identification information of the cell where the terminal 101 is located. The cell identification may be a PCI, etc.

[0374] In some embodiments, the terminal 101 may periodically report the terminal location information to the source distribution unit.

[0375] In some embodiments, the terminal 101 may report the terminal location information to the source distribution unit based on the network side instruction.

[0376] In some embodiments, the terminal 101 may report the terminal location information to the source distribution unit when the signal quality of the serving cell degrades.

[0377] In some embodiments, the terminal 101 may report a measurement report to the source distribution unit, including the terminal location information.

[0378] Step S2202: The source distribution unit sends the terminal location information to the first network device 102-2.

[0379] In some embodiments, the first network device 102 - 2 receives terminal location information.

[0380] In some embodiments, the first network device 102 - 2 is a centralized unit of a serving base station of the terminal 101 .

[0381] In some embodiments, the source distribution unit may send a measurement report to the first network device 102 - 2 , including the terminal location information.

[0382] In step S2203, the first network device 102-2 sends the terminal location information to the second network device 103-2.

[0383] In some embodiments, the second network device 103 - 2 receives terminal location information.

[0384] In some embodiments, the second network device 103 - 2 may be a candidate distribution unit of a serving base station when the terminal 101 switches.

[0385] In some embodiments, the number of the second network device 103 - 2 may be one or more, which is not limited in this disclosure.

[0386] In some embodiments, the first network device 102 - 2 sends an F1 Application Protocol (F1AP) message to the second network device 103 - 2 , where the message includes the terminal location information.

[0387] In an example, the first network device 102-2 sends a terminal context setup request (UE context setup request) message to the second network device 103-2. The terminal context setup request message may include terminal location information.

[0388] Step S2204: The second network device 103-2 adjusts beam parameters based on the terminal position.

[0389] In some embodiments, the names of the beam parameters are not limited.

[0390] In some embodiments, the beam parameters include but are not limited to at least one of the following: a pointing parameter of the beam; and a shape parameter of the beam.

[0391] In one example, the pointing parameter of the beam may be used to characterize the direction of the beam.

[0392] In an example, the pointing parameter of the beam includes but is not limited to at least one of the following: a beam width parameter; and a pointing parameter of a beam center point position.

[0393] Exemplarily, the beam width parameter can be used to characterize the beam bandwidth, where the beam bandwidth can be narrow bandwidth or wide bandwidth. It should be noted that the narrow bandwidth or wide bandwidth here are relative concepts, and the present disclosure does not limit the specific bandwidth.

[0394] Exemplarily, the pointing parameter of the beam center point position may be used to characterize the direction of the beam center point.

[0395] In one example, the shape parameters of the beam may be used to characterize the beamforming result.

[0396] Exemplarily, the shape parameters of the beam may include, but are not limited to, the antenna or antenna array used when transmitting the beam, the amplitude of the beam, the phase of the beam, and the like.

[0397] In some embodiments, the second network device 103 - 2 may adjust the pointing parameters of the beam based on the terminal location so that the beam direction is better aligned with the terminal location.

[0398] Exemplarily, the second network device 103 - 1 may adjust a beam width parameter based on the terminal position, for example, adjusting the beam width to a wide bandwidth or a narrow bandwidth.

[0399] Exemplarily, the second network device 103 - 2 may adjust the directional parameter of the beam center point position based on the terminal position, so that the direction pointed by the directional parameter of the beam center point position is aligned with the terminal position.

[0400] In some embodiments, the second network device 103 - 2 may adjust the shape parameters of the beam based on the terminal position to perform more accurate and reliable beamforming for the terminal 101 .

[0401] In some embodiments, the second network device 103 - 2 may adjust the pointing parameters and shape parameters of the beam based on the terminal position. The specific adjustment method is similar to the above process and will not be repeated here.

[0402] In some embodiments, a solution in which the second network device 103 - 2 adjusts other beam parameters based on the terminal position should also fall within the protection scope of the present disclosure.

[0403] Step S2205: The second network device 103-2 sends result indication information to the first network device 102-2.

[0404] In some embodiments, the first network device 102 - 2 receives result indication information.

[0405] In some embodiments, the name of the result indication information is not limited, and it can be, for example, an indication message, indication information, a first message, a first signaling, etc.

[0406] In some embodiments, the result indication information is used to indicate the result of the impact of the terminal position on the signal quality.

[0407] In some embodiments, the result indication information is used to instruct the second network device 103-2 to adjust the beam parameters based on the terminal position to determine the impact on the signal quality.

[0408] In some embodiments, the above-mentioned signal includes but is not limited to at least one of the following: an uplink signal from the terminal 101 received by the second network device 103 - 2 ; a downlink signal from the second network device 103 - 2 received by the terminal 101 .

[0409] In some embodiments, the result indication information is used to indicate, but is not limited to, any of the following: the terminal position will not affect the signal quality; the terminal position will affect the signal quality; the terminal position will improve the signal quality; the terminal position will reduce the signal quality.

[0410] Exemplarily, the result indication information is used to indicate that the terminal position will not affect the signal quality, for example, whether the second network device 103-2 adjusts the beam parameters based on the terminal position will not affect the uplink signal quality and / or will not affect the downlink signal quality.

[0411] Exemplarily, the result indication information is used to indicate that the terminal position will affect the signal quality. For example, if the second network device 103 - 2 adjusts the beam parameters based on the terminal position, it will affect the uplink signal quality and / or the downlink signal quality.

[0412] Exemplarily, the result indication information is used to indicate that the terminal position will improve signal quality, for example, the second network device 103 - 2 will improve uplink signal quality and / or downlink signal quality after adjusting beam parameters based on the terminal position.

[0413] Exemplarily, the result indication information is used to indicate that the terminal position will reduce signal quality, for example, after the second network device 103-2 adjusts the beam parameters based on the terminal position, the uplink signal quality and / or the downlink signal quality will be reduced.

[0414] Exemplarily, the result indication information is used to indicate one, two, or more of the following: the terminal location will not affect signal quality, will affect signal quality, will improve signal quality, or will reduce signal quality.

[0415] For example, whether the second network device 103 - 2 adjusts the beam parameters based on the terminal position will not affect the uplink signal quality, but adjusting the beam parameters will affect the downlink signal quality.

[0416] For another example, whether the second network device 103 - 2 adjusts the beam parameters based on the terminal position will not affect the uplink signal quality, but if the beam parameters are adjusted, the downlink signal quality will be affected and the downlink signal quality will be reduced.

[0417] In some embodiments, the second network device 103 - 2 may estimate the change value of the signal quality before and after adjusting the beam parameters based on its own implementation, and the result indication information includes the change value.

[0418] For example, the sign of the change value can be used to represent an improvement or decrease in signal quality, and the absolute value of the change value is used to represent the amount of change in signal quality.

[0419] The above description is merely an exemplary description, and other contents indicated by the result indication information should also fall within the scope of protection of this disclosure.

[0420] In some embodiments, the first network device 102-2 sends an F1AP message including the terminal location information to the second network device 103-2. Accordingly, the second network device 103-2 may send an F1AP message including the result indication information to the first network device 102-2.

[0421] Exemplarily, the first network device 102-2 sends a terminal context establishment request message to the second network device 103-2, which includes the terminal location information. Accordingly, the second network device 103-2 can send a terminal context establishment response (UE context setup response) message to the first network device 102-2, which includes the result indication information.

[0422] In some embodiments, when the bit value of the IE where the result indication information is located is set to a first value, it is used to indicate that the terminal position will not affect the signal quality; when it is set to a second value, it is used to indicate that the terminal position will affect the signal quality.

[0423] The first value may be "0" and the second value may be "1".

[0424] The first value may be "1" and the second value may be "0".

[0425] In some embodiments, when the bit value of the IE where the result indication information is located is set to the third value, it is used to indicate that the terminal position will improve the signal quality; when it is set to the fourth value, it is used to indicate that the terminal position will reduce the signal quality.

[0426] The third value may be “0” and the fourth value may be “1”.

[0427] The third value may be "1" and the fourth value may be "0".

[0428] In some embodiments, the IE where the result indication information is located includes at least two bits, which are used to indicate whether the terminal location will affect the signal quality, improve or reduce the signal quality.

[0429] For example, the bit value of the IE is "01" or "00", which is used to indicate that the terminal position will not affect the signal quality.

[0430] For another example, the bit value of the IE is "11", which indicates that the terminal position affects the signal quality and will improve the signal quality. The bit value of the IE is "10", which indicates that the terminal position affects the signal quality and will reduce the signal quality.

[0431] In some embodiments, the IE containing the result indication information includes at least two bits, which are used to indicate whether the terminal position will affect the uplink signal quality and whether it will affect the downlink signal quality.

[0432] For example, the bit value of the IE is "01", which is used to indicate that the terminal position will not affect the uplink signal quality, but will affect the downlink signal quality.

[0433] For another example, the bit value of the IE is "00", which is used to indicate that the terminal position will not affect the uplink signal quality and will not affect the downlink signal quality.

[0434] In some embodiments, the IE containing the result indication information includes at least four bits, which are used to indicate whether the terminal position will affect the uplink signal quality, improve or reduce the uplink signal quality, whether it will affect the downlink signal quality, and improve or reduce the downlink signal quality.

[0435] For example, the bit value of the IE is "0101", which is used to indicate that the terminal position will not affect the uplink signal quality and will not affect the downlink signal quality.

[0436] For another example, the bit value of the IE is "1110", which is used to indicate that the terminal position will affect the uplink signal quality, will improve the uplink signal quality, will affect the downlink signal quality, and will reduce the downlink signal quality.

[0437] In some embodiments, if the terminal context establishment response message includes an IE containing the result indication information, it is used to indicate that the terminal location will affect the signal quality; if the IE is not included, it is used to indicate that the terminal location will not affect the signal quality.

[0438] The above description is merely an example, and all indication methods of the result indication information should fall within the scope of protection of this disclosure.

[0439] Step S2206: The first network device 102-2 determines, based at least on the result indication information, a target distribution unit to be accessed by the terminal 101 when performing cell handover.

[0440] In some embodiments, the target distribution unit is one of the candidate distribution units, ie, the second network device 103 - 2 , and the target distribution unit is the distribution unit of the serving base station to be accessed when the terminal performs cell handover.

[0441] In some embodiments, the first network device 102 - 2 determines a target distribution unit based on the result indication information.

[0442] Exemplarily, the first network device 102 - 2 uses the result indication information to determine a second network device 103 - 2 as a target distribution unit, indicating that the terminal location will not affect the signal quality.

[0443] Exemplarily, the first network device 102 - 2 uses the result indication information to indicate that a second network device 103 - 2 whose terminal location may affect signal quality is determined as a target distribution unit.

[0444] Exemplarily, the first network device 102 - 2 uses the result indication information to determine a second network device 103 - 2 as a target distribution unit, indicating that the terminal position will improve signal quality.

[0445] Exemplarily, the first network device 102 - 2 uses the result indication information to indicate that the terminal position will affect the signal quality and a second network device 103 - 2 that will improve the signal quality is determined as a target distribution unit.

[0446] Exemplarily, the first network device 102-2 uses the result indication information to indicate that the terminal position will affect the uplink signal quality (eg, will improve or reduce the uplink signal quality) and a second network device 103-2 that will improve the downlink signal quality is determined as a target distribution unit.

[0447] Exemplarily, the first network device 102-2 uses the result indication information to indicate a second network device 103-2 as a target distribution unit, the second network device 103-2 indicating that the terminal position will not affect the uplink signal quality but will improve the downlink signal quality.

[0448] That is, the first network device 102 - 2 determines a second network device 103 - 2 that can achieve downlink coverage enhancement as a target distribution unit.

[0449] Exemplarily, the first network device 102-2 uses the result indication information to determine a second network device 103-2 as a target distribution unit indicating that the terminal position will improve uplink signal quality and affect downlink signal quality (eg, will improve or reduce downlink signal quality).

[0450] Exemplarily, the first network device 102 - 2 uses the result indication information to indicate that the terminal position will improve the uplink signal quality and will not affect the downlink signal quality, and determines a second network device 103 - 2 as a target distribution unit.

[0451] That is, the first network device 102 - 2 determines a second network device 103 - 2 that can achieve uplink coverage enhancement as a target distribution unit.

[0452] Exemplarily, the first network device 102 - 2 uses the result indication information to determine a second network device 103 - 2 as a target distribution unit, indicating that the terminal position will improve the uplink signal quality and the downlink signal quality.

[0453] That is, the first network device 102 - 2 determines a second network device 103 - 2 that can achieve uplink coverage enhancement and downlink coverage enhancement as a target distribution unit.

[0454] The above description is merely an exemplary description, and other solutions in which the first network device 102 - 2 determines the target distribution unit based on the result indication information should also fall within the protection scope of the present disclosure.

[0455] In some embodiments, the first network device 102 - 2 determines the target distribution unit based on the result indication information and other information.

[0456] In an example, other information includes but is not limited to a measurement report reported by the terminal.

[0457] Exemplarily, the first network device 102 - 2 determines the target distribution unit based on the measurement report and the result indication information.

[0458] For example, the first network device 102-2 first determines the second network device 103-2 whose terminal location will improve signal quality based on the result indication information, and then selects the second network device 103-2 with the best signal quality among these second network devices 103-2 as the target distribution unit.

[0459] For example, the first network device 102-2 first selects the second network devices 103-2 whose signal quality is higher than a preset threshold, and then selects a second network device 103-2 whose terminal position will improve the signal quality among these second network devices 103-2 as a target distribution unit.

[0460] In some embodiments, after determining the target distribution unit, the first network device 102 - 2 may control the terminal 101 to switch to the target distribution unit.

[0461] Step S2207: The first network device 102-2 sends result indication information to the source distribution unit.

[0462] In some embodiments, the source distribution unit receives the result indication information.

[0463] In some embodiments, there are multiple result indication information, and the first network device 102 - 2 sends multiple result indication information and an identifier of the second network device 103 - 2 corresponding to each result indication information.

[0464] In some embodiments, the first network device 102 - 2 may send the result indication information to the source distribution unit via an RRC message.

[0465] In some embodiments, the first network device 102 - 2 may send an RRCReconfiguration message to the source distribution unit, including result indication information.

[0466] In some embodiments, the indication method of the result indication information is similar to the indication method in step S2205 and will not be repeated here.

[0467] Exemplarily, the RRCReconfiguration message includes the IE where the result indication information is located, which is used to indicate that there is an impact on the signal quality, and is used to indicate that there is no impact on the signal quality.

[0468] Step S2208 : The source distribution unit sends result indication information to the terminal 101 .

[0469] In some embodiments, terminal 101 receives the result indication information.

[0470] In some embodiments, the source distribution unit may send the result indication information to the terminal 101 via an RRC message.

[0471] In some embodiments, the source distribution unit may send an RRCReconfiguration message to the terminal 101 , including result indication information.

[0472] In some embodiments, after receiving the RRCReconfiguration message, the terminal 101 may send an RRCReconfigurationComplete message to the source distribution unit, which forwards the message to the first network device 102-2, informing the first network device 102-2 that the terminal 101 has synchronously updated the RRC-related configuration.

[0473] Step S2209 : The terminal 101 determines, based at least on the result indication information, a target distribution unit to be accessed when the terminal 101 performs cell handover.

[0474] In some embodiments, the terminal 101 may determine the target distribution unit based on the result indication information.

[0475] In some embodiments, the terminal 101 may determine the target distribution unit based on the result indication information and other conditions for performing conditional switching.

[0476] The solution of the terminal 101 determining the target distribution unit based at least on the result indication information is similar to the solution of the first network device 102 - 2 determining the target distribution unit, and will not be described in detail here.

[0477] In some embodiments, after determining the target distribution unit, the terminal 101 may access the target distribution unit, and may disconnect from the first network device 102 - 2 before or after accessing the target distribution unit.

[0478] 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.

[0479] In some embodiments, the terms "uplink", "uplink", "physical uplink", etc. can be used interchangeably.

[0480] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0481] 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.

[0482] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0483] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" 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.

[0484] In some embodiments, the information transmission method involved in the embodiments of the present disclosure may include at least one of steps S2201 to S2209. For example, step S2203 can be implemented as an independent embodiment, steps S2201 + S2202 can be implemented as an independent embodiment, steps S2201 to S2203 can be implemented as independent embodiments, step S2204 can be implemented as an independent embodiment, step S2205 can be implemented as an independent embodiment, steps S2205 + step S2206 can be implemented as independent embodiments, and steps S2205 + step S2207 + step S2208 + step S2209 can be implemented as independent embodiments, but are not limited thereto.

[0485] In some embodiments, steps S2201 to S2202 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0486] In some embodiments, steps S2206 to S2209 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0487] In some embodiments, step S2204 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, the first network device 102-2 may adjust the beam parameters based on the terminal location, which is not limited in this disclosure.

[0488] In some embodiments, step S2206 and steps S2207 to S2209 may be performed one by one. For example, step S2206 corresponds to the centralized unit controlling the terminal to perform cell handover, and steps S2207 to S2209 correspond to CHO on the terminal side.

[0489] Exemplarily, step S2206 may be executed, and steps S2207 to S2209 may not be executed. In this case, the first network device 102 - 2 may determine a target distribution unit to be accessed by the terminal 101 during cell switching.

[0490] Exemplarily, steps S2207 to S2209 may be performed without performing step S2206, and the terminal 101 may determine the target distribution unit to be accessed during cell switching.

[0491] The impact result of the signal quality may be used as a new CHO switching condition event, and the terminal 101 needs to consider the impact result when executing CHO.

[0492] The existing CHO switching condition event may be reused, and the terminal 101 also needs to consider the impact result when executing CHO.

[0493] Exemplarily, the existing CHO switching condition event may be RSRP. The terminal 101 calculates a new RSRP for each cell based on the change value indicated in the result indication information and the RSRP of the cell in the measurement report, and determines to perform CHO based on the new RSRP.

[0494] The present disclosure does not limit the method for calculating the new RSRP.

[0495] In some embodiments, steps S2201 to S2209 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0496] In the above embodiment, the terminal can report the terminal location information to the source distribution unit, and the source distribution unit forwards it to the centralized unit. The candidate distribution unit can adjust the beam parameters based on the terminal location and provide the result indication information to the centralized unit. The result indication information is used to indicate the result of the impact of the terminal location on the signal quality. Then, the centralized unit or the terminal determines the target distribution unit to be accessed when the terminal performs cell switching based on at least the result indication information, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communication.

[0497] FIG3A is a flow chart 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 the first network device 102-1 or 102-2, and includes:

[0498] Step S3101, obtain terminal location information.

[0499] In some embodiments, the first network device 102-1 is the source base station of the terminal 101. The first network device 102-1 can obtain the terminal location information from the terminal 101, but is not limited thereto. The first network device 102-1 can also receive the terminal location information sent by other entities.

[0500] In some embodiments, the first network device 102 - 1 obtains terminal location information determined according to predefined rules.

[0501] In some embodiments, the first network device 102 - 1 performs processing to obtain the terminal location information.

[0502] In some embodiments, step S3101 is omitted, the first network device 102-1 autonomously implements the function indicated by the terminal location information, or the first network device 102-1 obtains the UE location information from other network nodes, or the above functions are default or default.

[0503] Accordingly, the optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0504] In some embodiments, the first network device 102-2 is a centralized unit of the service base station of the terminal 101. The first network device 102-2 can obtain the terminal location information from the source distribution unit of the service base station of the terminal 101, but is not limited to this. It can also receive terminal location information sent by other entities.

[0505] In some embodiments, the first network device 102 - 2 obtains terminal location information determined according to predefined rules.

[0506] In some embodiments, the first network device 102 - 2 performs processing to obtain the terminal location information.

[0507] In some embodiments, step S3101 is omitted, and the first network device 102 - 2 autonomously implements the function indicated by the terminal location information, or the above function is default or by default.

[0508] Accordingly, the optional implementation of step S3101 can refer to the optional implementation of step S2202 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0509] Step S3102, sending terminal location information.

[0510] In some embodiments, the first network device may send the terminal location information to the second network device.

[0511] In some embodiments, the second network device receives terminal location information.

[0512] In some embodiments, the first network device 102 - 1 is the source base station of the terminal 101 , and the second network device 103 - 1 is a candidate base station when the terminal 101 switches.

[0513] Accordingly, the optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0514] In some embodiments, the first network device 102-2 is a centralized unit of the serving base station of the terminal 101, and the second network device 103-2 is a candidate distributed unit of the serving base station when the terminal 101 switches, that is, intra-gNB switching.

[0515] Accordingly, the optional implementation of step S3102 can refer to the optional implementation of step S2203 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0516] Step S3103: Obtain result indication information.

[0517] In some embodiments, the first network device obtains the result indication information sent by the second network device, but is not limited thereto and may also receive the result indication information sent by other entities.

[0518] In some embodiments, the first network device obtains result indication information specified by the protocol.

[0519] In some embodiments, the first network device performs processing to obtain result indication information.

[0520] In some embodiments, step S3103 is omitted, the first network device autonomously implements the function indicated by the result indication information, or the first network device obtains the result indication information from other nodes, or the above function is default or acquiescent.

[0521] In some embodiments, the first network device 102 - 1 is the source base station of the terminal 101 , and the second network device 103 - 1 is a candidate base station when the terminal 101 switches.

[0522] Accordingly, the optional implementation of step S3103 can refer to the optional implementation of step S2104 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0523] In some embodiments, the first network device 102 - 2 is a centralized unit of a serving base station when the terminal 101 switches, and the second network device 103 - 2 is a candidate distributed unit of a serving base station when the terminal 101 switches.

[0524] Accordingly, the optional implementation of step S3103 can refer to the optional implementation of step S2205 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0525] Step S3104: determine the target network device.

[0526] In some embodiments, the first network device determines a target base station or a target distribution unit based at least on the result indication information.

[0527] In some embodiments, first network device 102-1 is the source base station of terminal 101, and second network device 103-1 is a candidate base station for handover of terminal 101. In this case, first network device 102-1 determines the target base station to be accessed by terminal 101 when performing cell handover based at least on the result indication information.

[0528] Accordingly, the optional implementation of step S3104 can refer to the optional implementation of step S2105 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0529] In some embodiments, first network device 102-2 is a centralized unit of a serving base station for terminal 101, and second network device 103-2 is a candidate distributed unit of a serving base station for terminal 101 during handover. In this case, first network device 102-1 determines a target distributed unit to be accessed by terminal 101 during cell handover based at least on the result indication information.

[0530] Accordingly, the optional implementation of step S3104 can refer to the optional implementation of step S2206 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0531] Step S3105: Send result indication information.

[0532] In some embodiments, the first network device 102 - 1 is a source base station of the terminal 101 , and the first network device 102 - 1 may send the result indication information to the terminal 101 .

[0533] Accordingly, the optional implementation of step S3105 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0534] In some embodiments, the first network device 102 - 2 is a centralized unit of a serving base station of the terminal 101 , and the first network device 102 - 2 may send the result indication information to a source distribution unit of the terminal 101 .

[0535] In some embodiments, the source distribution unit may forward the result indication information to the terminal 101 after receiving it.

[0536] Accordingly, the optional implementation of step S3105 can refer to the optional implementation of step S2207 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0537] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3105. For example, step S3101 may be implemented as an independent embodiment, step S3102 may be implemented as an independent embodiment, steps S3101 to S3102 may be implemented as independent embodiments, step S3103 may be implemented as an independent embodiment, step S3104 may be implemented as an independent embodiment, and step S3105 may be implemented as an independent embodiment, but the present invention is not limited thereto.

[0538] In some embodiments, step S3101 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0539] In some embodiments, step S3102 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, when the first network device is a centralized unit for terminal 101, the first network device may adjust beam parameters based on the terminal's location to determine the result indication information. In this case, the first network device does not need to send the terminal's location information.

[0540] In some embodiments, either step S3104 or step S3105 may be performed alternatively. For example, step S3104 corresponds to the first network device controlling the terminal to perform cell handover, and step S3105 corresponds to CHO.

[0541] Exemplarily, step S3104 may be executed without executing step S3105, or step S3105 may be executed without executing step S3104.

[0542] In the above embodiment, the first network device can provide the terminal location information to the second network device, thereby improving the reliability of the terminal when performing cell handover and improving the availability of NTN communication.

[0543] FIG3B is a flow chart of an information transmission method according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to an information transmission method, which can be executed by the second network device 103-1 or 103-2, and includes:

[0544] Step S3201, obtain terminal location information.

[0545] In some embodiments, the second network device 103-1 is a candidate base station when the terminal 101 switches. The second network device 102-1 can obtain the terminal location information from the first network device 102-1, such as the source base station, but is not limited to this. The terminal location information can also be received from other entities.

[0546] In some embodiments, the second network device 103 - 1 obtains terminal location information determined according to predefined rules.

[0547] In some embodiments, the second network device 103 - 1 performs processing to obtain the terminal location information.

[0548] In some embodiments, step S3201 is omitted, or the second network device 103 - 1 autonomously implements the function indicated by the terminal location information, or the above function is default or by default.

[0549] Accordingly, the optional implementation of step S3201 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0550] In some embodiments, the second network device 103-2 is a candidate distribution unit of the service base station when the terminal 101 switches. The second network device 103-2 can obtain the terminal location information from the first network device 102-2, such as the centralized unit of the service base station of the terminal 101, but is not limited to this. The terminal location information can also be received by other entities.

[0551] In some embodiments, the second network device 103 - 2 obtains terminal location information determined according to predefined rules.

[0552] In some embodiments, the second network device 103 - 2 performs processing to obtain the terminal location information.

[0553] In some embodiments, step S3201 is omitted, and the second network device 103 - 2 autonomously implements the function indicated by the terminal location information, or the above function is default or by default.

[0554] Accordingly, the optional implementation of step S3201 can refer to the optional implementation of step S2203 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0555] Step S3202: Adjust beam parameters.

[0556] In some embodiments, the second network device adjusts beam parameters based on the terminal location.

[0557] In some embodiments, the second network device 103-1 is a candidate base station when the terminal 101 switches. The optional implementation method of step S3202 can refer to the optional implementation method of step S2103 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0558] In some embodiments, the second network device 103-2 is a candidate distribution unit of the service base station when the terminal 101 switches. The optional implementation method of step S3202 can refer to the optional implementation method of step S2204 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0559] Step S3203: Send result indication information.

[0560] In some embodiments, the second network device sends result indication information to the first network device.

[0561] In some embodiments, the second network device 103-1 is a candidate base station when the terminal 101 switches. The optional implementation method of step S3203 can refer to the optional implementation method of step S2104 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0562] In some embodiments, the second network device 103-2 is a candidate distribution unit of the service base station when the terminal 101 switches. The optional implementation method of step S3203 can refer to the optional implementation method of step S2205 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0563] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3203. For example, step S3201 may be implemented as an independent embodiment, step S3202 may be implemented as an independent embodiment, steps S3201 to S3202 may be implemented as independent embodiments, and step S3203 may be implemented as an independent embodiment, but the present invention is not limited thereto.

[0564] In some embodiments, steps S3201 and S3202 are optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, when the first network device adjusts the beam parameters based on the terminal location, steps S3201 and S3202 may not be performed.

[0565] In some embodiments, step S3203 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, when the first network device adjusts the beam parameters based on the terminal location to determine the result indication information, step S3203 may not be performed.

[0566] In the above embodiment, the second network device can obtain the terminal location information, adjust the beam parameters based on the terminal location, and send the obtained result indication information to the first network device, thereby improving the reliability of the terminal when performing cell switching and improving the availability of NTN communication.

[0567] FIG3C is a flow chart 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 terminal 101 and includes:

[0568] Step S3301: reporting terminal location information.

[0569] In some optional embodiments, the terminal 101 may report the terminal location information to the first network device 102 - 1 , for example, a source base station.

[0570] Accordingly, the optional implementation of step S3301 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0571] In some optional embodiments, the terminal 101 may report the terminal location information to the source distribution unit.

[0572] Accordingly, the optional implementation of step S3301 can refer to the optional implementation of step S2201 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0573] Step S3302, obtaining result indication information.

[0574] In some embodiments, the terminal 101 receives result indication information sent by the first network device 102 - 1 , such as a source base station.

[0575] Accordingly, the optional implementation of step S3302 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0576] In some embodiments, the terminal 101 receives result indication information sent by the source distribution unit.

[0577] Accordingly, the optional implementation of step S3302 can refer to the optional implementation of step S2208 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0578] Step S3303: Determine the target network device.

[0579] In some embodiments, the terminal 101 determines the target base station based at least on the result indication information.

[0580] Accordingly, the optional implementation of step S3303 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0581] In some embodiments, terminal 101 determines a target distribution unit based at least on the result indication information.

[0582] Accordingly, the optional implementation of step S3303 can refer to the optional implementation of step S2209 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0583] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3301 to S3303. For example, step S3301 may be implemented as an independent embodiment, step S3302 may be implemented as an independent embodiment, and steps S3302 to S3303 may be implemented as independent embodiments, but are not limited thereto.

[0584] In some embodiments, step S3301 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0585] In some embodiments, steps S3302 to S3303 are optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the first network device determines the target base station or target distributed unit and controls terminal 101 to directly perform cell handover, steps S3302 to S3303 may not be performed.

[0586] When the terminal executes CHO, steps S3302 to S3303 may be executed.

[0587] In the above embodiment, the terminal can at least determine the target network device to be accessed when performing cell handover based on the result indication information, thereby improving the reliability of the terminal when performing cell handover and improving the availability of NTN communication.

[0588] The above solution provided in the embodiment of the present disclosure is further illustrated below with examples.

[0589] In the disclosed embodiments, to achieve enhanced uplink and downlink signal quality coverage, when a terminal performs a cell handover, a candidate base station or candidate distribution unit can adjust beam parameters based on the terminal's location information to determine the impact of signal quality. The source base station, centralized unit, or terminal uses the signal quality impact as a selection criterion for determining a target base station or distribution unit, ensuring that the terminal switches to a target base station or distribution unit with better signal quality. This improves the reliability of the terminal's cell handover, achieves enhanced uplink and downlink signal quality coverage, and enhances the availability of NTN communications.

[0590] In the embodiment of the present disclosure, in a cell handover scenario across base stations, the impact on the Xn interface and RRC signaling is as follows:

[0591] Impact on the Xn interface: When the source base station sends a switching request message to the candidate base station, the source base station also sends the terminal location information to the candidate base station. The candidate base station adjusts the beam parameters according to the terminal position and determines the result indication information. The result indication information is used to indicate the impact result of the signal quality determined after adjusting the beam parameters based on the terminal position.

[0592] When the candidate base station sends a handover response message to the source base station, it also sends result indication information.

[0593] Exemplarily, if there is no impact on signal quality, the bit value of the IE may be 0; if there is an impact on signal quality, the bit value of the IE may be 1.

[0594] Impact on RRC messages: When the source base station sends an RRCReconfiguration message to the terminal, it also sends result indication information from the candidate base station. The result indication information is used to indicate the impact of the terminal position on the signal quality, which serves as a condition for the terminal to determine the target base station. That is, the change in signal quality after the candidate base station adjusts the beam parameters is used as one of the conditions for the terminal to select the target base station.

[0595] In the embodiments of the present disclosure, any of the following methods may be used to determine a target base station to be accessed by a terminal when performing cell handover:

[0596] Method 1: After the source base station determines the target base station, the terminal is controlled to switch to the target base station.

[0597] Exemplarily, the source base station receives result indication information sent by the candidate base station through the Xn interface, and determines the target base station based at least on the result indication information.

[0598] Method 2: The terminal determines the target base station and then switches to the target base station.

[0599] Exemplarily, after receiving the result indication information sent by the candidate base station, the source base station sends it to the terminal via an RRC message, such as an RRCReconfiguration message. The terminal determines the target base station based at least on the result indication information.

[0600] The CHO process of FIG1D is improved, as shown in FIG4A , and includes the following steps:

[0601] Step S4100: The terminal context in the source base station contains information about roaming and access restrictions, which is provided by the core network equipment, such as AMF, when the connection is established or the last TA is updated.

[0602] Step S4101: The source base station configures the terminal measurement process, and the terminal reports according to the measurement configuration.

[0603] Exemplarily, the terminal may report the terminal location information to the source base station.

[0604] Step S4102: The source base station determines, based on the measurement report reported by the terminal, that the terminal needs to perform cell handover.

[0605] Step S4103: The source base station sends a handover request message to one or more candidate base stations, where the handover request message includes the terminal location information.

[0606] In step S4104, admission control may be performed by the candidate base station.

[0607] If slice information is sent to the candidate base station, slice-aware admission control should be performed. If a PDU session is associated with an unsupported slice, the candidate base station should reject such a PDU session. The candidate base station adjusts the beam parameters based on the terminal location and determines result indication information indicating the result of the impact of the terminal location on the signal quality.

[0608] Step S4105: The candidate base station sends a handover response message including the candidate cell configuration to the source base station. The handover response message includes result indication information.

[0609] Exemplarily, if the candidate base station determines that there is no impact on the signal quality, the bit value of the IE where the result indication information is located can be set to "0"; if the candidate base station determines that there is an impact on the signal quality, the bit value of the IE where the result indication information is located can be set to "1".

[0610] Step S4106: The source base station sends an RRCReconfiguration message to the terminal.

[0611] The message includes the configuration of the candidate cell and CHO execution conditions, as well as result indication information.

[0612] Step S4107: The terminal sends an RRCReconfigurationComplete message to the source base station.

[0613] Step S4107-a: If early data forwarding is applied, the source base station may send an early status transmission message to the candidate base station.

[0614] Step S4108: After receiving the above configuration, the terminal maintains the connection with the source base station and starts to evaluate the CHO execution conditions of the candidate cells.

[0615] The terminal determines the target base station based on the CHO execution conditions and result indication information. If at least one candidate cell meets the corresponding CHO execution conditions and its corresponding result indication information meets the preset requirements (for example, no impact on signal quality, improved signal quality, etc.), the terminal separates from the source base station, applies the stored corresponding configuration for the selected candidate cell, synchronizes to the candidate cell, and completes the RRC handover process by sending an RRCReconfigurationComplete message to the target base station. The terminal releases the stored CHO configuration after successfully completing the RRC handover process.

[0616] Step S4108-a: The target base station sends a HANDOVER SUCCESS message to the source base station, notifying the source base station that the terminal has successfully accessed the target base station.

[0617] Step S4108-b: In return, the source base station sends an SN STATUS TRANSFER message to the target base station.

[0618] Step S4108-c: The source base station sends a HANDOVER CANCEL message to other candidate base stations (if there are other candidate base stations) to cancel the CHO of the terminal.

[0619] In the embodiment of the present disclosure, in a cell handover scenario across distributed units, the impact on the Xn interface and RRC signaling is as follows:

[0620] Implementation method 1: The distributed unit (distributed unit deployed on the satellite) adjusts the beam parameters.

[0621] Impact on the F1 interface: When the centralized unit sends a UE CONTEXT SETUP REQUEST message to a candidate distributed unit, it also sends the terminal location information. The candidate distributed unit adjusts beam parameters to determine result indication information, which indicates the impact of the terminal location on signal quality. The candidate distributed unit responds to the centralized unit with a UE CONTEXT SETUP RESPONSE message, which includes the result indication information.

[0622] Impact on RRC signaling: The source distributed unit forwards the result indication information to the terminal through the RRCReconfiguration message as a condition for the terminal to determine the target distributed unit. That is, the impact of the signal quality determined after the candidate distributed unit adjusts the beam parameters is used as one of the conditions for the terminal to select the target distributed unit.

[0623] Implementation method 2: The centralized unit adjusts the beam parameters.

[0624] Impact on the F1 interface: The centralized unit adjusts beam parameters based on the terminal location and determines result indication information, which indicates the impact of the terminal location on signal quality. The centralized unit sends a DL RRC MESSAGE TRANSFER message to the source distributed unit, including the generated RRCReconfiguration message and the result indication information.

[0625] Impact on RRC signaling: The source distributed unit forwards the received RRCReconfiguration message, including the result indication information, to the terminal. The terminal then determines the target distributed unit based on at least the result indication information. Specifically, the terminal uses the signal quality impact of the candidate distributed unit after adjusting the beam parameters as one of the criteria for selecting the target distributed unit.

[0626] In the embodiments of the present disclosure, any of the following methods may be used to determine a target distribution unit to be accessed by a terminal when performing cell handover:

[0627] Method 1: The centralized unit determines the target distribution unit based on at least the result indication information.

[0628] Exemplarily, the central unit determines the target distribution unit based on the result indication information provided by the candidate distribution units, and then controls the terminal to access the target distribution unit.

[0629] Exemplarily, after determining the result indication information based on the terminal location, the centralized unit determines a target distribution unit based at least on the result indication information, and controls the terminal to access the target distribution unit.

[0630] Method 2: The centralized unit provides result indication information to the source distribution unit, which forwards it to the terminal, and the terminal determines the target distribution unit.

[0631] The CHO process of FIG. 1E is improved, as shown in FIG. 4B , and includes the following steps:

[0632] Step S4201: The terminal sends a measurement report to the source distribution unit. The terminal may report the terminal location information to the source distribution unit.

[0633] Step S4202: The source distribution unit sends a UL RRC MESSAGE TRANSFER message to the centralized unit, which may include a measurement report and terminal location information.

[0634] Step S4203: The centralized unit sends a UE CONTEXT SETUP REQUEST message to the candidate distributed unit to create a terminal context and set up one or more data bearers.

[0635] The UE CONTEXT SETUP REQUEST message is sent for each candidate distribution unit and includes handover preparation information (HandoverPreparationInformation) for conditional handover or semi-static configuration information for changing conditional primary and secondary cells.

[0636] Exemplarily, the UE CONTEXT SETUP REQUEST message includes terminal location information.

[0637] Step S4204: The candidate distributed unit responds to the centralized unit using a UE CONTEXT SETUP RESPONSE message.

[0638] The UE CONTEXT SETUP RESPONSE message includes the target cell identifier requested from the centralized unit.

[0639] Exemplarily, the UE CONTEXT SETUP RESPONSE message includes result indication information.

[0640] Step S4205: The centralized unit sends a DL RRC MESSAGE TRANSFER message to the source distributed unit, including the generated RRCReconfiguration message.

[0641] Exemplarily, the centralized unit may receive result indication information sent by the candidate distributed unit.

[0642] Exemplarily, the centralized unit adjusts the beam parameters based on the terminal position to thereby determine the result indication information.

[0643] Step S4206: The source distribution unit forwards the RRCReconfiguration message and result indication information to the terminal.

[0644] Step S4207: The terminal responds to the source distribution unit with an RRCReconfigurationComplete message.

[0645] Step S4208: The source distributed unit forwards the RRCReconfigurationComplete message to the centralized unit via a UL RRC MESSAGE TRANSFER message.

[0646] Step S4209: The execution condition for triggering the conditional switching or the conditional PSCell change is met, and the content indicated by the result indication information meets the preset requirements.

[0647] Step S4210: A random access process is performed between the terminal and the target distribution unit.

[0648] Step S4211: The terminal responds to the target distributed unit with an RRCReconfigurationComplete message.

[0649] The terminal sends an RRCReconfigurationComplete message to the target distributed unit.

[0650] Step S4212: The target distributed unit sends a UL RRC MESSAGE TRANSFER message to the centralized unit.

[0651] This message includes the RRCReconfigurationComplete message.

[0652] Step S4213: The centralized unit sends a UE CONTEXT MODIFICATION REQUEST message to the source distributed unit, instructing the terminal to stop data transmission.

[0653] The source distribution unit also sends a downlink data transmission status frame to notify the centralized unit that the downlink data has not been successfully transmitted to the terminal.

[0654] Step S4214: The source distributed unit responds to the centralized unit with a UE CONTEXT MODIFICATION RESPONSE message.

[0655] Step S4215: The centralized unit sends a UE CONTEXT RELEASE COMMAND message to the source distributed unit.

[0656] Step S4216: The source distributed unit releases the terminal context and responds to the centralized unit with a UE CONTEXT RELEASE COMPLETE message.

[0657] In the above embodiment, by adjusting beam parameters and determining result indication information, the reliability of the terminal in performing cell switching is improved, and coverage enhancement of uplink and downlink signal quality is achieved.

[0658] 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., an access network device) in any of the above methods.

[0659] 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.

[0660] 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.

[0661] FIG5A is a schematic diagram of the structure of a first network device according to an embodiment of the present disclosure. As shown in FIG5A , the first network device 5100 may include a transceiver module 5101 .

[0662] In some embodiments, the transceiver module 5101 is configured so that the first network device 5100 sends terminal location information to the second network device, where the terminal location information is used for the terminal to perform cell switching.

[0663] In some embodiments, the first network device 5100 may include a processing module 5102 (not shown in Figure 5A), and the transceiver module 5102 is configured to determine the target distribution unit of the target base station or serving base station to be accessed when the terminal performs cell switching based at least on the result indication information.

[0664] Optionally, the above-mentioned transceiver module 5101 is used to execute at least one of the communication steps such as sending and / or receiving performed by the first network device 5100 in any of the above methods (for example, step S2101, step S2102, step S2104, step S2106, step S2202, step S2203, step S2205, step S2207, but not limited to these), which will not be repeated here.

[0665] Optionally, the processing module 5102 is configured to execute at least one of the other steps (such as step S2105 and step S2206 , but not limited thereto) executed by the first network device 101 in any of the above methods, which will not be described in detail here.

[0666] FIG5B is a schematic diagram of the structure of a second network device according to an embodiment of the present disclosure. As shown in FIG5B , the second network device 5200 may include a transceiver module 5201 .

[0667] In some embodiments, the transceiver module 5201 is configured so that the second network device 5200 receives the terminal location information sent by the first network device, where the terminal location information is used for the terminal to perform cell switching.

[0668] In some embodiments, the second network device 5200 may include a processing module 5202 (not shown in FIG. 5B ), where the processing module 5202 is configured to adjust beam parameters based on the terminal location.

[0669] Optionally, the above-mentioned transceiver module 5201 is used to execute at least one of the communication steps such as sending and / or receiving that can be executed by the second network device 5200 in any of the above methods (for example, step S2102, step S2104, step S2203, step S2205, but not limited to these), which will not be repeated here.

[0670] Optionally, the processing module 5202 is configured to execute at least one of the other steps (such as step S2103 and step S2204, but not limited thereto) that can be executed by the second network device 5200 in any of the above methods, which will not be described in detail here.

[0671] FIG5C is a schematic diagram of the structure of a terminal proposed in an embodiment of the present disclosure. As shown in FIG5C , the terminal 5300 may include: a transceiver module 5301 and a processing module 5302 .

[0672] In some embodiments, the transceiver module 5301 is configured to enable the terminal 5300 to receive result indication information, where the result indication information is used to indicate the result of the impact of the terminal location on the signal quality.

[0673] In some embodiments, the processing module 5302 is configured to determine, based at least on the result indication information, a target distribution unit of a target base station or a serving base station to be accessed when performing cell handover.

[0674] Optionally, the above-mentioned transceiver module 5301 is used to execute at least one of the communication steps such as sending and / or receiving that can be executed by the terminal 5300 in any of the above methods (for example, step S2101, step S2106, step S2201, step S2208, but not limited to these), which will not be repeated here.

[0675] Optionally, the processing module 5202 is configured to execute at least one of the other steps (such as step S2107 and step S2209, but not limited thereto) that can be executed by the second network device 5200 in any of the above methods, which will not be described in detail here.

[0676] 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.

[0677] 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.

[0678] Figure 6A is a schematic diagram of the structure of a communication device 6100 proposed in an embodiment of the present disclosure. Communication device 6100 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 core 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 6100 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.

[0679] As shown in Figure 6A, the communication device 6100 includes one or more processors 6101. Processor 6101 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 communication protocols and communication data, and the central processing unit can be used to control the communication device (such as a base station, baseband chip, terminal device, terminal device chip, DU or CU, etc.), execute programs, and process program data. The communication device 6100 is used to perform any of the above methods.

[0680] In some embodiments, the communication device 6100 further includes one or more memories 6102 for storing instructions. Optionally, all or part of the memories 6102 may be located outside the communication device 6100.

[0681] In some embodiments, the communication device 6100 further includes one or more transceivers 6103. When the communication device 6100 includes one or more transceivers 6103, the transceiver 6103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, but not limited thereto), and the processor 6101 performs at least one of the other steps (step S2102, step S2103, but not limited thereto).

[0682] In some embodiments, a transceiver may include a receiver and / or a transmitter. The receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0683] In some embodiments, the communication device 6100 may include one or more interface circuits 6104. Optionally, the interface circuit 6104 is connected to the memory 6102. The interface circuit 6104 may be configured to receive signals from the memory 6102 or other devices, and may be configured to send signals to the memory 6102 or other devices. For example, the interface circuit 6104 may read instructions stored in the memory 6102 and send the instructions to the processor 6101.

[0684] The communication device 6100 described in the above embodiment may be a network device or a terminal, but the scope of the communication device 6100 described in the present disclosure is not limited thereto, and the structure of the communication device 6100 may not be limited to FIG6A. 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 and 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.

[0685] 6B is a schematic diagram of the structure of a chip 6200 according to an embodiment of the present disclosure. If the communication device 6200 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 6200 shown in FIG6B , but the present disclosure is not limited thereto.

[0686] The chip 6200 includes one or more processors 6201 , and the chip 6200 is configured to execute any of the above methods.

[0687] In some embodiments, the chip 6200 further includes one or more interface circuits 6202. Optionally, the interface circuit 6202 is connected to the memory 6203. The interface circuit 6202 can be used to receive signals from the memory 6203 or other devices, and can be used to send signals to the memory 6203 or other devices. For example, the interface circuit 6202 can read instructions stored in the memory 6203 and send the instructions to the processor 6201.

[0688] In some embodiments, the interface circuit 6202 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, but not limited to this), and the processor 6201 performs at least one of the other steps (step S2102, step S2103, but not limited to this).

[0689] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0690] In some embodiments, the chip 6200 further includes one or more memories 6203 for storing instructions. Alternatively, all or part of the memories 6203 may be outside the chip 6200.

[0691] The present disclosure also proposes a storage medium having instructions stored thereon. When the instructions are executed on the communication device 6100, the communication device 6100 executes 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.

[0692] The present disclosure also provides a program product, which, when executed by the communication device 6100, enables the communication device 6100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0693] 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.

[0694] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0695] 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: include: The first network device sends terminal location information to the second network device, where the terminal location information is used for the terminal to perform cell switching.

2. The method according to claim 1, characterized in that The method further comprises: The first network device receives result indication information sent by the second network device, where the result indication information is used to indicate a result of an impact of a terminal location on a signal quality.

3. The method according to claim 2, characterized in that The result indication information is used to instruct the second network device to adjust the beam parameters based on the terminal position to determine the result of the impact on the signal quality.

4. The method according to claim 3, characterized in that The beam parameters include at least one of the following: The pointing parameter of the beam; wherein the pointing parameter includes at least one of the following: a beam width parameter; a pointing parameter of the beam center point position; The shape parameters of the beam.

5. The method according to any one of claims 2 to 4, characterized in that: The signal includes at least one of the following: an uplink signal from the terminal received by the second network device; A downlink signal from the second network device received by the terminal.

6. The method according to any one of claims 2 to 5, characterized in that: The result indication information is used to indicate any of the following: The terminal position will not affect the signal quality; The terminal position may affect the signal quality; The terminal position will improve the signal quality; The end position can reduce the signal quality.

7. The method according to any one of claims 1 to 6, characterized in that: The first network device sending the terminal location information to the second network device includes any of the following: The first network device sends a handover request message to the second network device, where the handover request message includes the terminal location information; The first network device sends a terminal context establishment request message to the second network device, where the terminal context establishment request message includes the terminal location information.

8. The method according to any one of claims 2 to 7, characterized in that: The first network device receives result indication information sent by the second network device, including any one of the following: The first network device receives a switching response message sent by the second network device, where the switching response message includes the result indication information; The first network device receives a terminal context establishment response message sent by the second network device, where the terminal context establishment response includes the result indication information.

9. The method according to any one of claims 1 to 8, characterized in that: The first network device is a source base station of the terminal, and the second network device is a candidate base station of the terminal; or The first network device is a centralized unit of a serving base station of a terminal, and the second network device is a candidate distributed unit of the serving base station.

10. The method according to any one of claims 1 to 9, characterized in that: The method further comprises: The first network device determines, at least based on the result indication information, a target distribution unit of a target base station or a serving base station to be accessed by the terminal when performing cell switching.

11. The method according to any one of claims 1 to 10, characterized in that: The method further comprises: The first network device sends result indication information to the terminal or a source distribution unit of a serving base station of the terminal, where the result indication information is used by the terminal to determine a target base station to be accessed or a target distribution unit of a serving base station when performing cell switching.

12. The method according to any one of claims 1 to 11, characterized in that: The method further comprises any of the following: The first network device receives the terminal location information reported by the terminal; The first network device receives the terminal location information forwarded by a source distribution unit of a serving base station of the terminal, where the terminal location information is reported by the terminal to the source distribution unit.

13. An information transmission method, characterized in that: include: The second network device receives the terminal location information sent by the first network device, where the terminal location information is used by the terminal to perform cell switching.

14. The method according to claim 13, characterized in that The method further comprises: The second network device adjusts the beam parameters based on the terminal position.

15. The method according to claim 13 or 14, characterized in that The method further comprises: The second network device sends result indication information to the first network device, where the result indication information is used to indicate the result of the impact of the terminal position on the signal quality.

16. The method according to claim 15, characterized in that The result indication information is used to instruct the second network device to adjust the beam parameters based on the terminal position to determine the impact result on the signal quality.

17. The method according to any one of claims 14 to 16, characterized in that: The beam parameters include at least one of the following: The pointing parameter of the beam; wherein the pointing parameter includes at least one of the following: a beam width parameter; a pointing parameter of the beam center point position; The shape parameters of the beam.

18. The method according to any one of claims 15 to 17, characterized in that: The signal includes at least one of the following: an uplink signal from the terminal received by the second network device; A downlink signal from the second network device received by the terminal.

19. The method according to any one of claims 15 to 18, characterized in that: The result indication information is used to indicate any of the following: The terminal position will not affect the signal quality; The terminal position may affect the signal quality; The terminal position will improve the signal quality; The end position can reduce the signal quality.

20. The method according to any one of claims 13 to 19, characterized in that: The second network device receives the terminal location information sent by the first network device, including any one of the following: The second network device receives a handover request message sent by the first network device, where the handover request message includes the terminal location information; The second network device receives a terminal context establishment request message sent by the first network device, where the terminal context establishment request message includes the terminal location information.

21. The method according to any one of claims 15 to 20, characterized in that: The second network device sending result indication information to the first network device includes any one of the following: The second network device sends a switching response message to the first network device, where the switching response message includes the result indication information; The second network device sends a terminal context establishment response message to the first network device, where the terminal context establishment response includes the result indication information.

22. The method according to any one of claims 13 to 21, characterized in that: The first network device is a source base station of the terminal, and the second network device is a candidate base station of the terminal; or The first network device is a centralized unit of a serving base station of a terminal, and the second network device is a candidate distributed unit of the serving base station.

23. An information transmission method, characterized in that: include: The terminal receives result indication information, where the result indication information is used to indicate the result of the impact of the terminal position on the signal quality; The terminal determines, at least based on the result indication information, a target distribution unit of a target base station or a serving base station to be accessed when performing cell switching.

24. The method according to claim 23, characterized in that The result indication information is used to instruct the second network device to adjust the beam parameters based on the terminal position to determine the result of the impact on the signal quality.

25. The method according to claim 24, characterized in that The beam parameters include at least one of the following: The pointing parameter of the beam; wherein the pointing parameter includes at least one of the following: a beam width parameter; a pointing parameter of the beam center point position; The shape parameters of the beam.

26. The method according to any one of claims 23 to 25, characterized in that: The signal includes at least one of the following: an uplink signal from the terminal received by the second network device; A downlink signal from the second network device received by the terminal.

27. The method according to any one of claims 23 to 26, characterized in that: The result indication information is used to indicate any of the following: The terminal position will not affect the signal quality; The terminal position may affect the signal quality; The terminal position will improve the signal quality; The end position can reduce the signal quality.

28. The method according to any one of claims 23 to 27, characterized in that: The method further comprises any of the following: The terminal reports the terminal location information to the source base station; or The terminal reports the terminal location information to the source distribution unit of the serving base station, so that the source distribution unit forwards the terminal location information to the central unit of the serving base station.

29. The method according to any one of claims 23 to 28, characterized in that: The second network device is a candidate base station; or The second network device is a candidate distribution unit of the serving base station.

30. A first network device, characterized in that: include: The transceiver module is configured so that the first network device sends the terminal location information to the second network device, and the terminal location information is used for the terminal to perform cell switching.

31. A second network device, characterized in that: include: The transceiver module is configured to receive the terminal location information sent by the first network device through the second network device, where the terminal location information is used for the terminal to perform cell switching.

32. A terminal, characterized in that: include: a transceiver module, configured to receive result indication information for the terminal, wherein the result indication information is used to indicate the result of the influence of the terminal position on the signal quality; The processing module is configured to determine, at least based on the result indication information, a target distribution unit of a target base station or a serving base station to be accessed when performing cell switching.

33. A network device, characterized in that: include: one or more processors; Wherein, the network device is used to execute the information transmission method described in any one of claims 1-12 or 13-22.

34. A terminal, characterized in that: include: one or more processors; The terminal is used to execute the method for information transmission described in any one of claims 23-29.

35. A communication system, characterized in that: It includes a first network device, a second network device, and a terminal, wherein the first network device is configured to implement the information transmission method described in any one of claims 1 to 12, the second network device is configured to implement the information transmission method described in any one of claims 13 to 22, and the terminal is configured to implement the information transmission method described in any one of claims 23 to 29.

36. A storage medium storing instructions, characterized in that: When the instruction is executed on the communication device, the communication device executes the information transmission method as described in any one of claims 1-22 or 23-29.

Images