Information processing method, communication device, and storage medium

Abstract

The embodiments of the present disclosure provide an information processing method, a communication device, and a storage medium. The information processing method is executed by a user equipment (UE) and may comprise: sending first information to a core network node, the first information comprising information of candidate nodes for layer 1 and / or layer 2 triggered mobility (LTM) handover; and receiving second information sent by the core network node, the second information comprising first parameter pairs of the respective candidate nodes, wherein each first parameter pair comprises a first parameter and a second parameter, the first parameter of an nth node among the candidate nodes is used for determining the second parameter of the nth node, and the second parameter is used for determining a key for communication between the UE and the nth node, where n is a positive integer greater than or equal to 2.

Description

Information processing method, communication device, and storage medium TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of communication, and particularly relates to an information processing method, a communication device and a storage medium. BACKGROUND

[0002] Layer 1 / layer 2 triggered mobility (L1 / L2 Triggered Mobility, LTM) refers to a process of triggering a primary cell (PCell) or a primary secondary cell (PSCell) node change by a media access control (MAC) control element (CE) based on a layer 1 (Layer 1, L1) measurement result. In the process of primary node or primary secondary node change, the master cell group (MCG) or the secondary cell group (SCG) can be changed.

[0003] SUMMARY

[0004] The present disclosure provides an information processing method, a communication device and a storage medium.

[0005] According to a first aspect of the present disclosure, an information processing method is provided, which is performed by a first node, and the method comprises: sending first information to a core network node, the first information comprising information of candidate nodes for a layer 1 and / or layer 2 triggered mobility (LTM) handover; receiving second information sent by the core network node, the second information comprising a first parameter pair of each of the candidate nodes; the first parameter pair comprising a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes is used to determine the second parameter of the nth node; the second parameter is used to determine a key for communication between a user equipment (UE) and the nth node; and n is a positive integer greater than or equal to 2.

[0006] According to a second aspect of the present disclosure, an information processing method is provided, which is performed by a source node for a layer 1 and / or layer 2 triggered mobility (LTM) handover of a user equipment (UE), and the method comprises: sending fifth information to a target node, the fifth information being used to enable the target node to generate a key for communication with the UE based on a second parameter of a first parameter pair; and the first parameter pair is pre-configured by a core network node.

[0007] According to a third aspect of embodiments of the present disclosure, an information processing method is provided, wherein the method is performed by a target node, and the method further includes: receiving fourth information sent by a first node, the fourth information including at least a second parameter of the target node when performing layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE); the target node being one of candidate nodes of the LTM of the UE; and the second parameter of the target node being used to determine a key for the target node to communicate with the UE.

[0008] According to a fourth aspect of embodiments of the present disclosure, an information processing method is provided, wherein the method is performed by a core network node, and the method includes: receiving first information sent by a first node, the first information including information of candidate nodes of layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE); and sending second information to the first node, the second information including a first parameter pair of each of the candidate nodes; the first parameter pair including a first parameter and a second parameter; a first parameter of an nth node in the candidate nodes being used to determine a second parameter of the nth node; the second parameter being used to determine a key for a user equipment (UE) to communicate with the nth node; and n being a positive integer greater than or equal to 2.

[0009] According to a fifth aspect of embodiments of the present disclosure, an information processing method is provided, wherein the method is performed by a user equipment (UE), and the method includes: receiving third information sent by a first node; the third information including at least an LTM configuration of layer 1 and / or layer 2 triggered mobility (LTM) switching of the UE; the LTM configuration of the nth node including at least a configuration identifier of the nth node; or the LTM configuration of the nth node including at least the configuration identifier of the nth node and a first parameter of the nth node; and n being a positive integer greater than or equal to 2.

[0010] According to a sixth aspect of embodiments of the present disclosure, a first node is provided, wherein the first node includes: a sending module configured to send first information to a core network node, the first information including information of candidate nodes of layer 1 and / or layer 2 triggered mobility (LTM) switching; and a receiving module configured to receive second information sent by the core network node, the second information including a first parameter pair of each of the candidate nodes; the first parameter pair including a first parameter and a second parameter; a first parameter of an nth node in the candidate nodes being used to determine a second parameter of the nth node; the second parameter being used to determine a key for a user equipment (UE) to communicate with the nth node; and n being a positive integer greater than or equal to 2.

[0011] According to a seventh aspect of embodiments of the present disclosure, a source node of layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE) is provided, wherein the source node includes:

[0012] The sending module is configured to send fifth information to the target node, where the fifth information is used to enable the target node to generate a key for communication with the UE based on a second parameter of a first parameter pair, and the first parameter pair is preconfigured by the core network node.

[0013] According to an eighth aspect of the embodiments of the present disclosure, a target node is provided, and the target node comprises:

[0014] The receiving module is configured to receive fourth information sent by the first node, where the fourth information at least comprises a second parameter of the target node in layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE), and the target node is one of candidate nodes of LTM of the UE; and the second parameter of the target node is used to determine a key for communication between the target node and the UE.

[0015] According to a ninth aspect of the embodiments of the present disclosure, a core network node is provided, and the core network node comprises: a receiving module configured to receive first information sent by a first node, where the first information comprises information of candidate nodes in layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE); and a sending module configured to send second information to the first node, where the second information comprises a first parameter pair of each of the candidate nodes; the first parameter pair comprises a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes is used to determine a second parameter of the nth node; the second parameter is used to determine a key for communication between a user equipment (UE) and the nth node; and n is a positive integer greater than or equal to 2.

[0016] According to a tenth aspect of the embodiments of the present disclosure, a user equipment (UE) is provided, and the UE comprises:

[0017] The receiving module is configured to receive third information sent by a first node, where the third information at least comprises LTM configuration of layer 1 and / or layer 2 triggered mobility (LTM) switching of the UE; the LTM configuration of the nth node at least comprises a configuration identifier of the nth node; or the LTM configuration of the nth node at least comprises the configuration identifier of the nth node and a first parameter of the nth node; and n is a positive integer greater than or equal to 2.

[0018] According to an eleventh aspect of the embodiments of the present disclosure, a communication system is provided, and the communication system comprises a first node, a source node in layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE), a target node, a core network node, and the UE.

[0019] The first node is used to perform the method provided in any of the technical solutions of the first aspect.

[0020] The source node is used to perform the method provided in any of the technical solutions of the second aspect.

[0021] The target node is configured to perform the method provided by any of the technical solutions of the third aspect;

[0022] The core network node is configured to perform the method provided by any of the technical solutions of the fourth aspect;

[0023] The UE is configured to perform the method provided by any of the technical solutions of the fifth aspect.

[0024] According to the twelfth aspect of the embodiments of the present disclosure, a communication device is provided, and the communication device comprises one or more processors; and the processor is configured to invoke instructions to enable the communication device to perform the information processing method provided by any of the technical solutions of the first aspect to the fifth aspect.

[0025] According to the thirteenth aspect of the embodiments of the present disclosure, a storage medium is provided, and the storage medium stores instructions, which, when executed on a communication device, enable the communication device to perform the information processing method provided by any of the first aspect to the fifth aspect.

[0026] According to the fourteenth aspect of the embodiments of the present disclosure, a program product is provided, and the program product comprises a computer program, which, when executed on a communication device, enables the communication device to implement the information processing method provided by any of the technical solutions of the first aspect to the fifth aspect.

[0027] The technical solution provided by the embodiments of the present disclosure is that the first node pre-acquires the first parameter pair of each candidate node for the UE to perform LTM switching from the core network node, so that the first parameter pair related parameters do not need to be temporarily sent through a wireless link according to the target node accessed in the subsequent LTM switching process of the UE, thereby solving the security problem caused by sending corresponding parameters, and improving the security of communication between the UE and the access network node.

[0028] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the embodiments of the present disclosure.

[0030] FIG. 1A is a schematic diagram of an architecture of a communication system according to an exemplary embodiment;

[0031] FIG. 1B is a flowchart of LTM according to an exemplary embodiment;

[0032] FIG. 1C is a flowchart of key derivation according to an exemplary embodiment;

[0033] FIG. 2 is a flow diagram illustrating an information processing method according to an example embodiment;

[0034] FIG. 3 is a flow diagram illustrating an information processing method according to an example embodiment;

[0035] FIG. 4 is a flow diagram illustrating an information processing method according to an example embodiment;

[0036] FIG. 5 is a flow diagram illustrating an information processing method according to an example embodiment;

[0037] FIG. 6 is a flow diagram illustrating an information processing method according to an example embodiment;

[0038] FIG. 7 is a flow diagram illustrating an information processing method according to an example embodiment;

[0039] FIG. 8A is a flow diagram illustrating an information processing method according to an example embodiment;

[0040] FIG. 8B is a flow diagram illustrating an information processing method according to an example embodiment;

[0041] FIG. 9A is a structural diagram of a first node according to an example embodiment;

[0042] FIG. 9B is a structural diagram of a source node according to an example embodiment;

[0043] FIG. 9C is a structural diagram of a target node according to an example embodiment;

[0044] FIG. 9D is a structural diagram of a core network node according to an example embodiment;

[0045] FIG. 9E is a structural diagram of a UE according to an example embodiment;

[0046] FIG. 10A is a structural diagram of a communication device according to an example embodiment;

[0047] FIG. 10B is a structural diagram of a chip according to an example embodiment. DETAILED DESCRIPTION

[0048] Embodiments of the present disclosure provide an information processing method, a communication device, a communication system, and a storage medium.

[0049] The first aspect provides an information processing method, wherein the method is performed by a first node of a first node, and the method comprises:

[0050] sending, to a core network node, first information including information of candidate nodes for layer 1 and / or layer 2 triggered mobility (LTM) switching;

[0051] receiving second information sent by the core network node, the second information including a first parameter pair of each of the candidate nodes; the first parameter pair including a first parameter and a second parameter; the first parameter of an nth node of the candidate nodes being used to determine the second parameter of the nth node; the second parameter being used to determine a key for communication between a user equipment (UE) and the nth node; n being a positive integer greater than or equal to 2.

[0052] Based on the above scheme, the core network generates and securely distributes the first parameter pair of each candidate node to the first node, rather than generating the first parameter pair in real time when the UE accesses the corresponding node, so that the security problem caused by the UE receiving the first parameter in the first parameter pair of each node based on an unprotected air interface during the switching process is solved, and the security of communication between the UE and each node is improved.

[0053] In some embodiments of the first aspect, the method further includes sending, to the UE, third information including at least an LTM configuration of each of the candidate nodes; the LTM configuration of the nth node including at least a configuration identifier of the nth node; or the LTM configuration of the nth node including at least the configuration identifier of the nth node and the first parameter of the nth node.

[0054] Based on the above scheme, the first node securely sends the third information including the first parameter of each candidate node for LTM switching to the UE, which can reduce the risk of tampering with the transmission of important first parameters over an unprotected air interface, compared to sending a single first parameter over an air interface when the UE accesses the corresponding node, thereby improving security. In some embodiments of the first aspect, fourth information is sent to each of the candidate nodes, and the fourth information sent to the nth node includes at least the second parameter of the nth node.

[0055] Based on the above scheme, the first node receives the first parameter pair containing the first parameter and the second parameter generated by the core network node. Since the first node belongs to a node of a communication operator and is a secure node, and the transmission of information between nodes is securely protected, the first parameter pair sent by the first node to each candidate node can ensure the security of the first parameter pair.

[0056] In some embodiments of the first aspect, the fourth information sent to the nth node further includes the first parameter of each of the candidate nodes.

[0057] Based on the above scheme, the fourth information sent to the nth node further includes the first parameter of the other candidate nodes, facilitating the UE to know the current switching is LTM switching or to generate a key based on the second parameter in the first parameter pair for LTM switching based on the transfer of the first parameter between nodes when switching between candidate nodes.

[0058] The second aspect provides an information processing method, triggered by a layer 1 and / or a layer 2 of a user equipment (UE), a source node of a layer 1 and / or a layer 2 triggered mobility (LTM) switching, which can include: sending fifth information to a target node, the fifth information being used to make the target node generate a key for communication with the UE based on a second parameter in a first parameter pair; and the first parameter pair being pre-configured by a core network node.

[0059] Based on the above scheme, when the UE performs LTM switching, the source node sends the fifth information to the target node, which can make the target node generate a key for communication with the UE using the second parameter in the first parameter pair generated by the core network node, and the source node no longer generates a key for communication between the target node and the UE, so that the source node will not know the key for communication between the target node and the UE, thereby improving the security of communication between the UE and the target node.

[0060] In some embodiments of the second aspect, the method further includes: receiving sixth information sent by the target node; and the sixth information being used to indicate whether the target node allows the UE to access.

[0061] Based on the above scheme, through the transmission of the sixth information, it can be known whether the target node agrees to the access of the UE.

[0062] In some embodiments of the second aspect, the method further includes: sending seventh information to the UE, the seventh information being used to indicate that the UE accesses the target node.

[0063] Based on the above scheme, through the transmission of the seventh information, the source node can inform the UE of the configuration information of accessing the target node.

[0064] In some embodiments of the second aspect, the fifth information includes a first parameter of the target node; and the first parameter of the target node is used by the target node to determine to generate a key for communication with the UE using the second parameter in the first parameter pair.

[0065] Based on the above scheme, the fifth information carries the first parameter, and the target node can determine to generate a key for communication with the UE using the second parameter in the first parameter pair according to the first parameter.

[0066] The third aspect provides an information processing method, wherein the method is performed by a target node, and the method further comprises: receiving fourth information sent by a first node, wherein the fourth information comprises at least a second parameter of the target node when performing layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE); the target node is one of candidate nodes of the LTM of the UE; and the second parameter of the target node is used to determine a key used for communication between the target node and the UE.

[0067] In some embodiments of the third aspect, the fourth information further comprises a first parameter of each candidate node of the LTM switching of the UE.

[0068] In some embodiments of the third aspect, the method further comprises: receiving fifth information sent by a source node; and determining, according to the fifth information, that a key used for communication between the target node and the UE is generated by using the second parameter of the target node.

[0069] In some embodiments of the third aspect, the method further comprises: sending, to the source node, sixth information, wherein the sixth information is used to indicate that the UE is allowed to access the target node.

[0070] In some embodiments of the third aspect, the fifth information comprises a first parameter of the target node; and the first parameter of the target node and the second parameter of the target node constitute a first parameter pair of the target node.

[0071] In some embodiments of the third aspect, the method further comprises: generating, according to the second parameter of the first parameter pair of the target node, a key used for communication between the target node and the UE; or generating, according to the second parameter of the first parameter pair of the target node and time information of the UE accessing the target node, a key used for communication between the target node and the UE.

[0072] The above scheme provides two ways of generating a key used for communication between the UE and the target node, and the introduction of time information can further enable the UE to have different keys when repeatedly accessing a node, thereby further improving the security of communication.

[0073] In some embodiments of the third aspect, the method further comprises: in a case where N2 link change is needed when the UE switches from the source node to the target node, sending, to a core network node, eighth information; the eighth information comprises a first indication; and the first indication is used to indicate that the core network node does not need to generate a second parameter pair for the UE, wherein the second parameter pair is used for non-LTM switching of the UE.

[0074] Based on the above scheme, since the core network node pre-generates the first parameter pair of each candidate node, even if the UE involves N2 link switching during switching, the eighth information sent to the core network node will carry the first indication that the core network node receiving the eighth information does not generate the second parameter pair, thereby reducing unnecessary parameter pair generation and key out-of-sync confusion caused by the core network node generating the parameter pair again.

[0075] The fourth aspect provides an information processing method, wherein the method is performed by a core network node, and the method comprises: receiving first information sent by a first node, wherein the first information comprises information of candidate nodes of layer 1 and / or layer 2 trigger mobility (LTM) switching of a user equipment (UE); and sending second information to the first node, wherein the second information comprises a first parameter pair of each of the candidate nodes; the first parameter pair comprises a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes is used to determine the second parameter of the nth node; the second parameter is used to determine a key for communication between a user equipment (UE) and the nth node; and n is a positive integer greater than or equal to 2.

[0076] In some embodiments of the fourth aspect, the method further comprises:

[0077] generating the second parameter of the first parameter pair of the second node according to the key of the first node and the identity of the second node, and generating the second parameter of the first parameter pair of the (y+1)th node according to the second parameter of the first parameter pair of the yth node and the identity of the (y+1)th node; or

[0078] generating the second parameter of the first parameter pair of the second node according to the key of the first node and the LTM configuration identity of the second node, and generating the second parameter of the first parameter pair of the (y+1)th node according to the second parameter of the first parameter pair of the yth node and the LTM configuration identity of the (y+1)th node;

[0079] The y is a positive integer greater than or equal to 2.

[0080] In some embodiments of the fourth aspect, the method further comprises: generating the second parameter of the first parameter pair of the zth node according to the key of the first node and the identity of the zth node; or

[0081] generating the second parameter of the first parameter pair of the zth node according to the key of the first node and the LTM configuration identity of the zth node;

[0082] The z is a positive integer greater than or equal to 2.

[0083] In some embodiments of the fourth aspect, the method further comprises: receiving eighth information sent by a target node of the UE for LTM switching, the eighth information comprising a first indication; wherein the first indication is used to indicate that the core network node does not need to generate a second parameter pair for the UE for non-LTM switching of the UE.

[0084] In some embodiments of the fourth aspect, the first indication is an LTM switching indication or a no-derivation indication.

[0085] In some embodiments of the fourth aspect, the core network node further configures the n-th node with a second parameter pair; the second parameter pair is used for non-LTM switching of the UE.

[0086] The fifth aspect provides an information processing method, wherein the method is performed by a user equipment (UE), and the method comprises: receiving third information sent by a first node; the third information at least comprises layer 1 and / or layer 2 trigger mobility (LTM) configuration of the UE for LTM switching; the LTM configuration of the n-th node at least comprises a configuration identifier of the n-th node; or the LTM configuration of the n-th node at least comprises the configuration identifier of the n-th node and a first parameter of the n-th node; n is a positive integer greater than or equal to 2.

[0087] In some embodiments of the fifth aspect, the method further comprises: generating a first parameter of a first parameter pair of a second node according to a key of the first node and an identifier of the second node; generating a first parameter of a first parameter pair of a y+1-th node according to a second parameter of the first parameter pair of the y-th node and an identifier of the y+1-th node; or generating a second parameter of a first parameter pair of a second node according to a key of the first node and an LTM configuration identifier of the second node, and generating a second parameter of a first parameter pair of a y+1-th node according to a second parameter of the first parameter pair of the y-th node and an LTM configuration identifier of the y+1-th node.

[0088] y is a positive integer greater than or equal to 2.

[0089] In some embodiments of the fifth aspect, the method further comprises: generating a second parameter of a first parameter pair of a z-th node according to a key of the first node and an identifier of the z-th node; or generating a second parameter of a first parameter pair of a z-th node according to a key of the first node and an LTM configuration identifier of the z-th node; z is a positive integer greater than or equal to 2.

[0090] In some embodiments of the fifth aspect, the method further comprises: receiving seventh information sent by a source node of the LTM switch, the seventh information being used to indicate that the UE switches to a target node; and determining a key for the UE to communicate with the target node according to at least the second parameter of the first parameter pair of the target node.

[0091] In some embodiments of the fifth aspect, the determining the key for the UE to communicate with the target node according to at least the second parameter of the first parameter pair of the target node can comprise: determining the key for the UE to communicate with the target node according to the second parameter of the first parameter pair of the target node; or determining the key for the UE to communicate with the target node according to the second parameter of the first parameter pair of the target node and time information of the UE accessing to the target node.

[0092] The sixth aspect provides a first node, wherein the first node comprises: a sending module configured to send first information to a core network node, the first information comprising information of candidate nodes of layer 1 and / or layer 2 triggered mobility (LTM) switching; and a receiving module configured to receive second information sent by the core network node, the second information comprising first parameter pairs of the candidate nodes; the first parameter pair comprising a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes being used to determine the second parameter of the nth node; the second parameter being used to determine a key for a user equipment (UE) to communicate with the nth node; and n being a positive integer greater than or equal to 2.

[0093] The seventh aspect provides a source node of layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE), wherein the source node comprises: a sending module configured to send fifth information to a target node, the fifth information being used to enable the target node to generate a key for the UE to communicate based on a second parameter of a first parameter pair; and the first parameter pair being pre-configured by a core network node.

[0094] The eighth aspect provides a target node, wherein the target node comprises: a receiving module configured to receive fourth information sent by a first node, the fourth information comprising at least a second parameter of the target node when a user equipment (UE) performs layer 1 and / or layer 2 triggered mobility (LTM) switching; and the target node being one of candidate nodes of the LTM of the UE; and the second parameter of the target node being used to determine a key for the target node to communicate with the UE.

[0095] In a ninth aspect, a core network node is provided, and the core network node comprises: a receiving module configured to receive first information sent by a first node, the first information comprising information of candidate nodes of layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE); and a sending module configured to send second information to the first node, the second information comprising a first parameter pair of each of the candidate nodes; the first parameter pair comprising a first parameter and a second parameter; the first parameter of an nth node of the candidate nodes is used to determine the second parameter of the nth node; the second parameter is used to determine a key of communication between the UE and the nth node; and n is a positive integer greater than or equal to 2.

[0096] In a tenth aspect, a UE is provided, and the UE comprises: a receiving module configured to receive third information sent by a first node; the third information comprising at least an LTM configuration of layer 1 and / or layer 2 triggered mobility (LTM) switching of the UE; the LTM configuration of the nth node comprising at least a configuration identifier of the nth node; or the LTM configuration of the nth node comprising at least the configuration identifier of the nth node and a first parameter of the nth node; and n is a positive integer greater than or equal to 2.

[0097] In an eleventh aspect, a communication system is provided, and the communication system comprises a first node, a source node, a target node, a core network node, and a UE of layer 1 and / or layer 2 triggered mobility (LTM) switching; the first node is configured to perform the method of any of the technical solutions of the first aspect; the source node is configured to perform the method of any of the technical solutions of the second aspect; the target node is configured to perform the method of any of the technical solutions of the third aspect; the core network node is configured to perform the method of any of the technical solutions of the fourth aspect; and the UE is configured to perform the method of any of the technical solutions of the fifth aspect.

[0098] In a twelfth aspect, a program product is provided, and the program product comprises a computer program, which, when executed by a communication device, enables the communication device to implement the information processing method described in the optional implementation manners of the first aspect to the fifth aspect.

[0099] In a thirteenth aspect, a computer program is provided, which, when executed on a computer, enables the computer to perform the information processing method described in the optional implementation manners of the first aspect to the fifth aspect.

[0100] It can be understood that the UE, the network device, the communication system, the program product, and the computer program are all used to perform the method provided in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved by them can refer to the beneficial effects in the corresponding method, which will not be described here again.

[0101] The embodiments of the present disclosure provide an information processing method, a communication device, a communication system and a storage medium. The embodiments of the present disclosure are not exhaustive, but only illustrate some embodiments, and are not specific limitations on the protection scope of the present disclosure. In the case of no contradiction, each step in an embodiment can be implemented as an independent embodiment, and the steps can be combined arbitrarily, for example, the way of removing some steps in an embodiment can also be implemented as an independent embodiment, and the order of the steps in an embodiment can be exchanged arbitrarily, in addition, the optional implementation manners in an embodiment can be combined arbitrarily; in addition, the embodiments can be combined arbitrarily, for example, the steps of different embodiments can be combined arbitrarily, an embodiment can be combined with the optional implementation manners of other embodiments.

[0102] In the embodiments of the present disclosure, the terms and / or descriptions between the embodiments are consistent and can be referred to each other if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0103] The terms used in the embodiments of the present disclosure are only for the purpose of describing the specific embodiments, and not as a limitation on the present disclosure.

[0104] In the embodiments of the present disclosure, unless otherwise specified, the elements expressed in singular form, such as "one", "a", "the", "above", "preceding", "this", etc., can represent "one and only one", or "one or more", "at least one", etc. For example, in the case of using articles such as "a", "an", "the" in English, the noun after the article can be understood as singular expression, or as plural expression.

[0105] In the embodiments of the present disclosure, "plurality" means two or more.

[0106] In some embodiments, the terms "at least one of", "one or more", "a plurality of", "multiple", and the like can be replaced with each other.

[0107] In some embodiments, the description of "at least one of A, B", "A and / or B", "A or B in one case, A or B in another case", "one of A or B", and the like, can include the following technical manners according to the case: in some embodiments, A is executed (A is executed regardless of B); in some embodiments, B is executed (B is executed regardless of A); in some embodiments, A and B are selectively executed (A and B are selectively executed); in some embodiments, A and B are executed (A and B are executed). When there are more branches such as A, B, C, and the like, the above description is similar.

[0108] In some embodiments, the description of "A or B" and the like can include the following technical manners according to the case: in some embodiments, A is executed (A is executed regardless of B); in some embodiments, B is executed (B is executed regardless of A); in some embodiments, A and B are selectively executed (A and B are selectively executed). When there are more branches such as A, B, C, and the like, the above description is similar.

[0109] The prefix words "first", "second", and the like in the embodiments of the present disclosure are only used to distinguish different description objects, and do not constitute a limitation on the position, order, priority, quantity, or content of the description objects. The description of the description objects should refer to the description in the context of the claims or embodiments, and should not constitute an additional limitation because of the use of the prefix words. For example, the description objects are "fields", and the ordinal words before "fields" in "first field" and "second field" do not limit the position or order between "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of "first field" and "second field". For another example, the description objects are "levels", and the ordinal words before "levels" in "first level" and "second level" do not limit the priority between "levels". For another example, the quantity of the description objects is not limited by the ordinal words, and can be one or more. For example, "first device", where the quantity of "devices" can be one or more. In addition, the objects modified by different prefix words can be the same or different, for example, the description objects are "devices", and "first device" and "second device" can be the same device or different devices, and their types can be the same or different. For another example, the description objects are "information", and "first type of information" and "second type of information" can be the same information or different information, and their contents can be the same or different.

[0110] In some embodiments, "including A", "containing A", "for indicating A", "carrying A", can be interpreted as directly carrying A, or indirectly indicating A.

[0111] In some embodiments, the terms "…", "determining …", "in the case of …", "when …", "when …", "if …", and the like can be replaced with each other.

[0112] In some embodiments, the terms "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", "above", and the like can be replaced with each other, and the terms "less than", "less than or equal to", "not greater than", "fewer than", "fewer than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", "below", and the like can be replaced with each other.

[0113] In some embodiments, an apparatus and the like can be interpreted as an entity, and can also be interpreted as virtual, and the name thereof is not limited to the name described in the embodiments. The terms "apparatus", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", and the like can be replaced with each other.

[0114] In some embodiments, "network" can be interpreted as a network-side device or network function included in an access network device, a core network device, and the like in a network.

[0115] In some embodiments, the terms “access network device (AN device),” “radio access network device (RAN device),” “base station (BS),” “radio base station,” “fixed station,” “node,” “access point,” “transmission point (TP),” “reception point (RP),” “transmission / reception point (TRP),” “panel,” “antenna panel,” “antenna array,” “cell,” “macro cell,” “small cell,” “femto cell,” “pico cell,” “sector,” “cell group,” “serving node,” “node (carrier),” “component node,” “bandwidth part (BWP),” and the like can be used interchangeably.

[0116] In some embodiments, the terms "terminal," "terminal device," "user equipment (UE)," "user UE," "mobile station (MS)," "mobile UE (MT)," "subscriber station," "mobile unit," "subscriber unit," "wireless unit," "remote unit," "mobile device," "wireless device," "wireless communication device," "remote device," "mobile subscriber station," "access UE," "mobile terminal," "wireless terminal," "remote terminal," "handset," "user agent," "mobile client," "client," and so on can be replaced with each other.

[0117] In some embodiments, the access network device, the core network device, or the network device can be replaced with the UE. For example, the embodiments of the present disclosure can also be applied to a structure in which communication between the access network device, the core network device, or the network device and the UE is replaced with communication between a plurality of UEs (e.g., device-to-device (D2D), vehicle-to-everything (V2X), and so on). In this case, the structure in which the UE has all or part of the functions of the access network device can also be provided. In addition, the terms "uplink," "downlink," and so on can also be replaced with terms corresponding to the inter-UE communication (e.g., "side"). For example, the uplink channel, the downlink channel, and so on can be replaced with the side channel, and the uplink, the downlink, and so on can be replaced with the sidelink.

[0118] In some embodiments, the UE can be replaced with the access network device, the core network device, or the network device. In this case, the structure in which the access network device, the core network device, or the network device has all or part of the functions of the UE can also be provided.

[0119] In some embodiments, the data, information, etc. can be obtained in compliance with the laws and regulations of the country where the location is situated.

[0120] In some embodiments, the data, information, etc. can be obtained after obtaining the consent of the user.

[0121] In addition, each element, each row, or each column in the table of the embodiments of the present disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0122] FIG. 1A is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure.

[0123] As shown in FIG. 1A, the communication system 100 includes a terminal 101 and a network device 102. The network device 102 can include an access network device and / or a core network device. The terminal can also be referred to as a UE.

[0124] In some embodiments, the terminal 101 includes at least one of a mobile phone, a wearable device, an Internet of Things device, a communication-capable automobile, a smart automobile, a Pad, a computer with wireless transceiver function, a virtual reality (VR) UE device, an augmented reality (AR) UE device, a wireless UE device in industrial control, a wireless UE device in self-driving, a wireless UE device in remote medical surgery, a wireless UE device in smart grid, a wireless UE device in transportation safety, a wireless UE device in smart city, a wireless UE device in smart home, and the like, but is not limited thereto.

[0125] In some embodiments, the UE is also referred to as a User Equipment (UE).

[0126] In some embodiments, the access network device may, for example, be at least one of a node or a device that accesses a UE to a wireless network, and the access network device may, for example, include at least one of an evolved NodeB (eNB) in a 5G communication system, a next generation eNB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved node B (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 RAN, a Cloud RAN, a base station in other communication systems, an access node in a Wi-Fi system, but is not limited thereto.

[0127] In some embodiments, the technical means of the present disclosure can be applicable to an Open RAN architecture, at which time the interfaces between or within the access network devices involved in the embodiments of the present disclosure can become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0128] In some embodiments, the access network device can be composed of a central unit (CU) and a distributed unit (DU), where the CU can also be referred to as a control unit. The CU-DU structure can split the protocol layers of the access network device, and some of the protocol layers can be controlled by the CU, and the rest or all of the protocol layers can be distributed in the DU and controlled by the CU, but is not limited thereto.

[0129] In some embodiments, the core network device can be one device including the first network element, or can be multiple devices or device groups each including the first network element. The network element can be virtual or physical. The core network may, for example, include at least one of an evolved packet core (EPC), a 5G core network (5GCN), and a next generation core (NGC).

[0130] It can be understood that the communication system described in the embodiments of the present disclosure is for more clearly illustrating the technical means of the embodiments of the present disclosure, and does not constitute a limitation on the technical means provided by the embodiments of the present disclosure. It can be known by those skilled in the art that, as the system architecture evolves and new service scenarios appear, the technical means provided by the embodiments of the present disclosure are also applicable to similar technical problems.

[0131] The embodiments of the present disclosure described below can be applied to the communication system 100 shown in FIG. 1A or part of the subjects, but are not limited thereto. The subjects shown in FIG. 1A are exemplary, and the communication system can include all or part of the subjects in FIG. 1A, or other subjects other than those in FIG. 1A. The number and form of each subject is arbitrary, and the connection relationship between the subjects is exemplary. The subjects can not be connected or can be connected, and the connection can be in any manner, can be direct connection or indirect connection, and can be wired connection or wireless connection.

[0132] 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 (Bluetooth (registered trademark)), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine to Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), system using other resources, next-generation system extended based thereon, and the like. Further, a plurality of systems can be combined (for example, LTE and NR can be combined).

[0133] In LTM, the next generation NodeB (gNB) receives L1 measurement report from User Equipment (UE), based on which, the gNB changes the serving node of the UE by MAC CE issued node change command. The node change command indicates the LTM candidate node configuration that the gNB previously provides to the UE by Radio Resource Control (RRC) signaling. The UE accesses the target node indicated in the received node change command. LTM can be used to reduce mobility latency. LTM candidate node configuration can only be added, modified and released by the network through RRC signaling. LTM supports subsequent LTM, which refers to LTM based on candidate nodes without RRC reconfiguration between network devices and UE. That is, after performing mobility operation, the UE does not autonomously delete the configuration information of LTM, which can continue to be used even without RRC reconfiguration and update, for triggering subsequent LTM (Subsequent LTM). For example, the configuration information of the LTM can include information of the candidate node.

[0134] LTM supports intra-frequency or inter-frequency node change. In some scenarios, only Distributed Unit (DU) internal LTM and DU internal LTM are supported. In some scenarios, New Radio (NR) mobility enhancement is extended to inter-CU or inter-node or inter-gNB (inter-CU, inter-node, inter-gNB) LTM. Exemplarily, the inter-CU or inter-node or inter-gNB LTM supports the following scenarios:

[0135] Example 1: CU acts as MN when no data center is configured;

[0136] Example 2: CU acts as SN and MCG is unchanged when NR-DC is configured;

[0137] Example 3: CU acts as MN and SCG is unchanged or SCG is released when NR-DC is configured. For inter-CU LTM, multiple candidate gNB-CUs will participate in the migration flow.

[0138] The signaling flow of LTM can be as shown in FIG. 1B, including the following three stages:

[0139] Phase 1: Phase 1 is also the LTM preparation phase, in which the initial gNB decides candidate nodes and initiates cross-node interaction for LTM preparation across CUs based on L3 RRM measurement reports. After the interaction, the initial gNB provides the LTM configuration to the UE through RRC configuration of multiple candidate nodes.

[0140] The initial gNB decides candidate nodes and initiates inter-node interaction for LTM preparation across CUs. After the interaction, the initial gNB provides the LTM configuration to the UE with RRC configuration of multiple candidate nodes.

[0141] Phase 2: Phase 2 is also the LTM initialization node, in which the UE sends L1 measurement reports to the initial gNB. After receiving the node switch command MAC CE, the UE switches to one of the candidate nodes. To support RACH-less LTM, the UE can be synchronized with the candidate nodes in advance, specifically, the UE performs DL and UL synchronization with the candidate nodes before receiving the node switch command.

[0142] Phase 3: Subsequent LTM phase, in which steps similar to steps 8-14 are performed. The subsequent LTM is triggered by the current serving gNB, which itself is one of the candidate gNBs for the candidate LTM.

[0143] The key update synchronization between the UE and the gNB in the non-LTM scenario switching process can be as follows: During the switching of the inter-CU mobility process, the synchronization of the AS security key between the UE and the target gNB is achieved by using the NCC value of the source gNB, and then forwarded to the UE in the RRC reconfiguration signaling. When it is necessary to establish an initial AS security context between the UE and the gNB, the AMF and the UE will derive K gNB and a next hop (NH) parameter (NCC (NH chain Counter) is associated with each K gNB and the NH parameter. Each K gNB is associated with an NCC corresponding to the NH value.

[0144] In the Xn switching, if the source gNB has unused {NH, NCC} pairs, vertical key derivation should be performed. The source gNB should first calculate K gNB from the currently activated K NG-RAN* (if horizontal key derivation) or from the NH (if vertical key derivation). Then, the source gNB forwards the {K NG-RAN* , NCC} pair to the target gNB. The target gNB should directly use the received K NG-RAN* as K gNB to be used with the UE. The target gNB should use the NCC value received from the source gNB with this KgNB The target gNB includes the received NCC in the prepared Handover (HO) command message, which is sent to the source gNB in a transparent container and forwarded by the source gNB to the UE.

[0145] Regardless of whether a gNB-CU internal handover, Xn handover or N2 handover is performed, the UE behaves the same, except that when a gNB-CU internal handover is performed, the UE can retain the same keys according to the indication of the gNB. In the case of conditional handover, the UE behaves the same, for example, the UE shall use the keys selected in the derivation of the target node's parameters. NG-RAN* derived from the target node's parameters selected in the derivation.

[0146] If the UE receives an NCC value in the HO command message from the target gNB through the source gNB that is equal to the currently active K gNB associated NCC value, the UE derives K gNB from the currently active K NG-RAN* and the target PCI and its frequency (ARFCN-DL or EARFCN-DL).

[0147] If the UE receives an NCC value that is different from the currently active gNB associated NCC value, the UE shall first derive the NH parameter by calculating the iteration synchronization locally saved and increase the NCC value until it matches the NCC value received from the source gNB through the HO command message. When the NCC value matches, the UE uses the synchronized NH parameter and the target Physical Cell Identity (PCI) PCI and its frequency Absolute Radio-Frequency Channel Number Downlink (ARFCN-DL) or Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) Absolute Radio Frequency Channel Number Downlink (EARFCN-DL) to calculate K NG-RAN* .

[0148] The UE shall use K NG-RAN* as K gNB .

[0149] The source gNB shall {K NG-RAN*, NCC} to the target gNB. The target gNB shall directly use the received K NG-RAN* as KgNB to be used with the UE. The target gNB shall associate the NCC value received from the source gNB with this KgNB. The target gNB includes the received Next Hop Chaining Counter parameter (NCC) in the prepared HandOver (HO) HO command message, which is sent back to the source gNB and forwarded by the source gNB to the UE.

[0150] In the current cross-gNB node handover procedure, the security-related configurations (such as NCC, KgNB) are first synchronized between the source gNB and the target gNB. NG-RAN*) Then, the NCC is sent by the source gNB to the UE through RRC reconfiguration at each handover. As mentioned above, the NCC is used by the UE to synchronize the AS security key update with the target gNB. However, for the mobility enhancement procedure of cross-gNB LTM, the RRC reconfiguration message is not sent by the source gNB at each handover. Then, how to update and send the NCC value to the UE to synchronize the AS security key update at each handover becomes a pending problem. In the current cross-gNB handover procedure, the security-related configurations (such as NCC) required for AS security key update synchronization are transmitted from the source gNB to the terminal through RRC reconfiguration on the Uu interface at the preparation stage of each handover.

[0151] For the LTM enhancement across CUs, the preparation stage is only performed by the initial gNB, instead of being performed in each subsequent handover, that is, the LTM enhancement across CUs has no preparation stage before each handover. Due to this design, the RRC reconfiguration signaling is only performed by the initial gNB at the LTM preparation stage, and the RRC reconfiguration signaling is replaced by the MAC CE message in each handover after the LTM preparation stage. Since the MAC CE message is not protected, carrying the security-related configurations in the MAC CE message will face the risk of being tampered by attackers. When the NCC value received by the terminal is tampered, the key derived by the terminal will be different from the key derived by the target terminal from the source gNB. This different synchronization of the AS security key update between the terminal and the target gNB will result in a failed handover.

[0152] Therefore, from the security perspective, it is not recommended to carry the security-related configurations in the MAC CE message. And there is no other existing mechanism to deliver the NCC value used by the source gNB to the UE to achieve the AS security key update synchronization of the LTM across CUs.

[0153] As shown in FIG. 2, the embodiment of the disclosure provides an information processing method, which is executed by the communication system shown in FIG. 1A. The method can include:

[0154] S2101: The first node sends first information to a core network node.

[0155] In some embodiments, the first node can be an access network node. Exemplarily, the access network node can include various types of base stations.

[0156] In some embodiments, the first node can be an initial base station of the UE. Exemplarily, the initial base station can be the first base station that the UE connects to after returning to a service area from a non-service area, the first connected station after the UE is powered on, or the first connected base station after the UE exits a mode such as a flight mode that refuses to connect to a mobile communication network.

[0157] In some embodiments, the core network node can be any core network function that manages mobility or access of the UE. Exemplarily, the core network node can include but is not limited to an access management function (AMF) or a mobile management entity (MME).

[0158] In some embodiments, the first node sends the first information to the core network node after establishing a connection with the UE.

[0159] In some embodiments, the first information includes information of candidate nodes of a layer 1 and / or layer 2 triggered mobility (LTM) handover. Exemplarily, the first information includes but is not limited to at least one of the following:

[0160] a node identifier of the candidate node;

[0161] a cell identifier of an LTM candidate cell of the UE associated with the candidate node. Exemplarily, one candidate node is associated with one or more candidate cells.

[0162] In some embodiments, the first information can be request information that the first node requests the core network node for LTM configuration.

[0163] S2102: The core network node sends second information to the first node.

[0164] In some embodiments, the core network node sends the second information to the first node according to the first information.

[0165] In some embodiments, the second information includes a first parameter pair of each of the candidate nodes.

[0166] In some embodiments, the first parameter pair includes a first parameter and a second parameter. Illustratively, the first parameter can be used to identify the second parameter. In some embodiments, the first parameter can include, but is not limited to, the Next Hop Chanining Counter Parameter (NCC). In some embodiments, the second parameter can be used to generate a key for communication between the UE and the access network node. Illustratively, the second parameter can include, but is not limited to, the Next Hop parameter (NH).

[0167] In some embodiments, one candidate node can have a first parameter pair. The first parameter pair is used for LTM handover of the UE.

[0168] Illustratively, the first parameter of the nth node of the candidate nodes is used to determine the second parameter of the nth node. Illustratively, the second parameter is used to determine a key for communication between the UE and the nth node. Illustratively, the second parameter is used to determine an integrity key, a confidentiality key, or a ciphering key, etc. for communication between the UE and the nth node.

[0169] In some embodiments, the n is a positive integer greater than or equal to 2.

[0170] In some embodiments, the first parameter pair of each candidate node is pre-configured by the core network node after receiving the first information, instead of being assigned to the candidate node on the fly during the process of the UE requesting to handover to the candidate node of LTM handover.

[0171] After assigning the first parameter pair, the core network node returns the first parameter pair of each candidate node to the first node in the second information.

[0172] In some embodiments, the second information can further include an LTM configuration. Illustratively, the LTM configuration can be a configuration of LTM handover of the UE. Illustratively, the LTM configuration can be an LTM configuration of the candidate node or an LTM configuration of the candidate cell.

[0173] In some embodiments, the core network node generating the first parameter pair of each candidate node can include: the core network node generating the first parameter of each candidate node; and the core network node generating the second parameter of each candidate node. Illustratively, the first parameter is generated according to the ranking of each candidate node.

[0174] In some embodiments, a second parameter of a first parameter pair of a second node is generated according to a key of the first node and an identity of the second node; and / or, a second parameter of a first parameter pair of a (y+1)th node is generated according to a second parameter of a first parameter pair of a yth node and an identity of the (y+1)th node. The identity of the second node can include an identity of a base station or a number of a base station. In some embodiments, the identity of the second node can also be a cell identity of a cell that the UE is ready to access. The cell identity uniquely represents the cell and can also uniquely represent the base station.

[0175] In some embodiments, a second parameter of a first parameter pair of a second node is generated according to a key of the first node and an LTM configuration identity of the second node, and a second parameter of a first parameter pair of a (y+1)th node is generated according to a second parameter of a first parameter pair of a yth node and an LTM configuration identity of the (y+1)th node. Exemplarily, the LTM configuration identity is used to identify the LTM configuration.

[0176] The y can be a positive integer greater than or equal to 2.

[0177] In some other embodiments, a second parameter of a first parameter pair of a zth node is generated according to a key of the first node and an identity of the zth node.

[0178] In some other embodiments, a second parameter of a first parameter pair of a zth node is generated according to a key of the first node and an LTM configuration identity of the zth node.

[0179] In some embodiments, the z is a positive integer greater than or equal to 2.

[0180] Exemplarily, the key of the first node can be a key used by the UE to communicate with the first node.

[0181] S2103: The first node sends third information to the UE.

[0182] In some embodiments, the third information at least includes LTM configurations of the candidate nodes.

[0183] In some embodiments, the LTM configuration of the nth node at least includes a configuration identity of the nth node.

[0184] In some embodiments, the LTM configuration of the nth node at least includes a configuration identity of the nth node and a first parameter of the nth node.

[0185] In some embodiments, the LTM configuration can also include a cell identity of a candidate cell of LTM switching.

[0186] The first node sends the LTM configuration to the UE in advance, facilitating the UE to perform the LTM switching and / or subsequent LTM switching

[0187] S2104: The first node sends the fourth information to each candidate node.

[0188] In some embodiments, the first node sends the fourth information to each candidate node according to the second information.

[0189] In some embodiments, the fourth information sent to the nth node at least includes the second parameter of the nth node. Illustratively, the fourth information sent to the nth node can include the first parameter pair of the nth node, i.e., the fourth information sent to the nth node can include the first parameter and the second parameter of the nth node.

[0190] In some embodiments, the fourth information sent to the nth node further includes the first parameter of each candidate node. It is worth noting that the fourth information sent to the nth node further including the first parameter of other candidate nodes is an optional step. For example, after the nth node obtains the first parameter of other candidate nodes, the nth node can send a handover request carrying the first parameter to the target node when the nth node serves as the source node of LTM switching. In this way, after the target node receives the handover request, it knows that it is LTM switching and obtains its own first parameter pair or second parameter to determine the key for communication with the UE. However, it is worth noting that the handover request carrying the first parameter is an optional operation. For example, the handover request carries an indicator of LTM. After the target node receives the handover request, it can also know that it is LTM switching of the UE, so as to generate the key for communication with the UE according to the corresponding second parameter.

[0191] S2105: The source node sends the fifth information to the target node.

[0192] In some embodiments, when the source node receives the measurement report of the UE and determines to perform LTM switching, the source node sends the fifth information to the target node. The target node is determined by the source node according to the measurement report of the UE on each candidate node.

[0193] In some embodiments, the fifth information is used by the target node to determine the second parameter of the first parameter pair of the LTM switching pre-configured by the core network node to generate the key for communication with the UE.

[0194] The source node can be the aforementioned first node or one of the candidate nodes of LTM switching.

[0195] The source node sends the fifth information to the target node, and the target node receives the fifth information sent by the source node.

[0196] In some embodiments, the fifth information can comprise an identity of the target node or an identity of a target cell that the UE accesses, etc.

[0197] In some embodiments, the fifth information comprises a first parameter of the target node. The first parameter can be used by the target node to determine that the current handover is an LTM handover, or to generate a key for communication with the UE using a second parameter of the first parameter pair if the UE is allowed to access. It is worth noting that the first parameter is optional information of the fifth information. For example, the first parameter in the fifth information can be replaced by an indicator of the LTM handover.

[0198] In some embodiments, the fifth information further comprises an identity of the UE that requests to access the target node.

[0199] S2106: The target node sends sixth information to the source node.

[0200] In some embodiments, the sixth information can be used to indicate whether the UE is allowed to access the target node. Illustratively, the target node can determine whether the UE is allowed to access according to its own capacity and / or the type of the UE.

[0201] S2107: The source node sends seventh information to the UE.

[0202] In some embodiments, the source node sends the seventh information to the UE according to the sixth information. Illustratively, the sixth information indicates that the UE is allowed to access the target node, and the seventh information that allows the UE to access the target node is sent to the UE.

[0203] In some embodiments, the seventh information can comprise an identity of the target node or an identity of a target cell that the UE accesses or an LTM configuration identity of the target node cell, etc.

[0204] S2108: The target node generates a key for communication with the UE.

[0205] In some embodiments, the target node generates the key for communication with the UE if the UE is allowed to access.

[0206] In some embodiments, the target node generating the key for communication with the UE can comprise:

[0207] Generating the key for communication with the UE according to a second parameter of a first parameter pair of the target node.

[0208] In some embodiments, the target node generating the key for communication with the UE can comprise: generating the key for communication with the UE according to a second parameter of a first parameter pair of the target node and time information of the UE accessing the target node.

[0209] In some embodiments, the time information can be time-of-day information in Coordinated Universal Time (UTC) or Universal Standard Time (UST), etc. Thus, if the UE switches to the same node multiple times, the keys generated by the target node based on the second parameter pre-configured by the core network node are different each time, which enhances the security of the communication between the UE and the target node.

[0210] In some embodiments, the target node generates the key for the communication with the UE using the following parameters to generate the key for the communication with the UE:

[0211] P0 = PCI of the target node;

[0212] L0 = length of the PCI of the target node, for example, 0x00 or 0x02;

[0213] P1 = ARFCN-ID, for example, the absolute frequency value of the SSB of the target node.

[0214] L1 = ARFCN-ID, for example, 0x00 or 0x03;

[0215] The input key of the KDF is the second parameter of the target node, for example, the NH of the target node.

[0216] KDF represents a key derivation function.

[0217] In other embodiments, the target node generates the key for the communication with the UE can use the following way:

[0218] P0 = PCI of the target node;

[0219] L0 = length of the PCI of the target node, for example, 0x00 or 0x02;

[0220] P1 = ARFCN-ID, for example, the absolute frequency value of the SSB of the target node.

[0221] L1 = ARFCN-ID, for example, 0x00 or 0x03;

[0222] P1 = UTC; for example, the UTC represents the time information when the UE accesses the target node.

[0223] L1 = length of the UTC;

[0224] The input key of the KDF should be the second parameter of the first parameter pair of the target node.

[0225] S2109: The UE generates the key for the communication with the target node.

[0226] In some embodiments, the target node allows the UE to access, and the UE generates a key for communication with the target node.

[0227] In some embodiments, the UE generating the key for communication with the target node can include:

[0228] obtaining a second parameter of the target node generated according to the first parameter;

[0229] generating the key for communication with the target node according to the second parameter of the target node.

[0230] In some embodiments, after the UE receives the LTM configuration sent by the first node, the UE can pre-generate the second parameter of each candidate node according to the identity of the node and the first parameter carried in the LTM configuration. At this time, the obtaining of the second parameter of the target node generated according to the first parameter can be reading the pre-generated second parameter of the target node.

[0231] In other embodiments, the UE generates the second parameter of the target node according to the first parameter of the target node again in the case that the UE determines to access the target node or the target node indicating allowing the UE to access when requesting access.

[0232] In some embodiments, the UE generating the second parameter can include:

[0233] generating the first parameter of the first parameter pair of the second node according to the key of the first node and the identity of the second node, generating the first parameter of the first parameter pair of the y+1 node according to the second parameter of the first parameter pair of the y node and the identity of the y+1 node, or

[0234] generating the second parameter of the first parameter pair of the second node according to the key of the first node and the LTM configuration identity of the second node, generating the second parameter of the first parameter pair of the y+1 node according to the second parameter of the first parameter pair of the y node and the LTM configuration identity of the y+1 node;

[0235] The y is a positive integer greater than or equal to 2. The y+1 node here is the previous node of the y node.

[0236] Exemplarily, the first parameter of each candidate node is generated in the following way:

[0237] NCC LTM1 : KDF<— (K gNB0 , ID1, K AMF ) ;

[0238] NCC LTM2 : KDF<— (NH LTM1 , ID2, K AMF ) ;

[0239] NCC LTM3 : KDF<— (NH LTM2 , ID3, K AMF ).

[0240] In some embodiments, K gNB0 is a key of the first node. ID1 can be an identity of the second node or an LTM configuration identity. ID2 can be an identity of the third node or an LTM configuration identity. Configuration ID3 can be an identity of the fourth node or an LTM configuration identity. NCC LTM1 may be a first parameter value of a first parameter pair of the second node. NCC LTM2 may be a first parameter of a first parameter pair of the third node. NCC LTM3 may be a first parameter of a first parameter pair of the fourth node. K AMF may be a key of a core network node (AMF). NH LTM1 may be a second parameter of the second node. NH LTM2 may be a second parameter of the third node. KDF can be a derivation function.

[0241] In some embodiments, the UE generating the second parameter can include:

[0242] generating a second parameter of a first parameter pair of the zth node according to the key of the first node and an identity of the zth node; or generating a second parameter of a first parameter pair of the zth node according to the key of the first node and an LTM configuration identity of the zth node; the z being a positive integer greater than or equal to 2.

[0243] In some embodiments, the UE can generate the second parameter in the following way:

[0244] P0 = K gNB0 ;

[0245] L0 = length of K gNB0 ;

[0246] P1 = ID; exemplary, the ID can be an ID or an LTM configuration ID of the zth node;

[0247] L1 = length of ID;

[0248] The input key of KDF is the second parameter of the first parameter pair of the zth node.

[0249] K gNB0 is a key of the first node.

[0250] In summary, the UE generates the second parameter in the same way as the core network node, and if the UE is a legitimate UE or a device authorized for LTM handover, the second parameter generated by the UE is the same as the parameter generated by the core network node, otherwise the second parameter generated by the UE will be different from the second parameter generated by the core network node, and the UE will eventually fail to access the target node.

[0251] In some embodiments, generating, according to the second parameter, a key for communication with the target node can include:

[0252] determining, according to the second parameter of the first parameter pair of the target node, a key for communication between the UE and the target node; or

[0253] determining, according to the second parameter of the first parameter pair of the target node and time information of the UE accessing the target node, a key for communication between the UE and the target node.

[0254] In some embodiments, the UE generates the communication key of the target node in the same way as the target node generates the key based on the second parameter.

[0255] S2110: The target node sends eighth information to the core network node.

[0256] In some embodiments, the eighth information includes a first indication.

[0257] In some embodiments, the first indication indicates that the core network node does not need to generate a second parameter pair for the UE.

[0258] In some embodiments, the second parameter pair is used for non-LTM handover of the UE. For example, non-LTM handover can include regular handover and / or conditional handover, etc., any cell handover unrelated to LTM.

[0259] In some embodiments, the target node sends the eighth information to the core network node in the case that the UE needs to change the N2 link when switching from the source node to the target node. In some embodiments, the target node does not need to send the eighth information to the core network node in the case that the UE does not need to change the N2 link when switching from the source node to the target node. That is, S2110 is an optional step.

[0260] In some embodiments, the first indication is an LTM handover indication or a no-derivation indication.

[0261] As shown in FIG. 3, the embodiments of the present disclosure provide an information processing method, which is performed by a first node, and the method can include:

[0262] S3101: Send first information.

[0263] In some embodiments, the first node can be an access network node. Exemplarily, the first node can be an initial base station of the UE.

[0264] In some embodiments, the first information comprises information of candidate nodes for layer 1 and / or layer 2 triggered mobility (LTM) switching.

[0265] In some embodiments, the first information can comprise an identity of the UE, an identity of the candidate nodes and / or an identity of candidate cells for LTM switching of the UE.

[0266] In some embodiments, the first node sends the first information to the core network node.

[0267] In some embodiments, the related descriptions of the first information, the first node and the core network node can be referred to the corresponding embodiments of FIG. 2.

[0268] In some embodiments, the optional implementation manners of S3101 can be referred to the optional implementation manners of S2101 of the corresponding embodiments of FIG. 2.

[0269] S3102: receiving second information.

[0270] In some embodiments, the first node receives the second information sent by the core network node.

[0271] In some embodiments, the related descriptions of the second information can be referred to the corresponding embodiments of FIG. 2, which will not be repeated here.

[0272] S3103: sending third information.

[0273] In some embodiments, the first node sends the third information to the UE.

[0274] In some embodiments, the related descriptions of the third information can be referred to the corresponding embodiments of FIG. 2, which will not be repeated here.

[0275] In some embodiments, the optional implementation manners of S3103 can be referred to the optional implementation manners of S2103 of the corresponding embodiments of FIG. 2.

[0276] S3104: sending fourth information.

[0277] In some embodiments, the first node sends the fourth information to each candidate node.

[0278] In some embodiments, the related descriptions of the fourth information can be referred to the corresponding embodiments of FIG. 2, which will not be repeated here.

[0279] In some embodiments, the optional implementation manners of S3104 can be referred to the optional implementation manners of S2104 of the corresponding embodiments of FIG. 2.

[0280] It is worth noting that S3103 and S3104 do not have a certain order, S3103 can be executed first and then S3104 is executed, or S3104 is executed first and then S3103 is executed, or S3103 and S3104 are executed at the same time.

[0281] As shown in FIG. 4, the embodiment of the disclosure provides an information processing method, which is executed by a source node, and the method can include:

[0282] S4101: receiving fourth information.

[0283] In some embodiments, the source node is a current serving base station of the UE or a source base station of LTM switching. In some embodiments, the source base station can be the aforementioned first node. In other embodiments, the source node can be a candidate base station in the aforementioned LTM switching. If the current source base station is the aforementioned first base station, S4101 does not need to be executed. If the source node is not the aforementioned first node, S4101 can be executed to receive the fourth information from the first node. That is, S4101 is an optional step.

[0284] In some embodiments, the related description of the fourth information can refer to the corresponding embodiment of FIG. 2.

[0285] S4102: sending fifth information.

[0286] In some embodiments, the source node sends the fifth information to the target node.

[0287] In some embodiments, the fifth information includes a first parameter of the target node; the first parameter of the target node is used by the target node to determine a second parameter in the first parameter pair; and the second parameter in the first parameter pair is used by the target node to generate a key for communication with the UE.

[0288] In some embodiments, the fifth information can include a first parameter in the first parameter pair of the target node.

[0289] In some embodiments, the optional implementation of the source node sending the fifth information can refer to the corresponding embodiment S2105 of FIG. 2.

[0290] S4103: receiving sixth information.

[0291] In some embodiments, the source node receives the sixth information sent by the target node.

[0292] In some embodiments, the related description of the sixth information can refer to the corresponding embodiment of FIG. 2.

[0293] S4104: sending seventh information.

[0294] In some embodiments, the source node sends the seventh information to the UE.

[0295] In some embodiments, the related description of the seventh information can be referred to the corresponding embodiment of FIG. 2.

[0296] In some embodiments, the optional implementation of the seventh information sent by the source node can be referred to the corresponding embodiment S2107 of FIG. 2.

[0297] As shown in FIG. 5, the embodiment of the present disclosure provides an information processing method, which is executed by a target node, and the method can include:

[0298] S5101: receiving fourth information.

[0299] In some embodiments, the target node receives the fourth information sent by the first node.

[0300] In some embodiments, the target node is any one of the candidate nodes in the LTM switching of the UE.

[0301] In some embodiments, the related description of the fourth information can be referred to the corresponding embodiment of FIG. 2.

[0302] S5102: receiving fifth information.

[0303] In some embodiments, the target node receives the fifth information sent by the source node. Exemplarily, the source node can be the aforementioned first node or any one of the candidate nodes in the LTM switching.

[0304] In some embodiments, the related description of the fifth information can be referred to the corresponding embodiment of FIG. 2.

[0305] S5103: sending sixth information.

[0306] In some embodiments, the target node sends the sixth information to the source node.

[0307] In some embodiments, the related description of the sixth information can be referred to the corresponding embodiment of FIG. 2.

[0308] In some embodiments, the optional implementation of the sixth information can be referred to the corresponding embodiment S2106 of FIG. 2.

[0309] S5104: generating a key.

[0310] In some embodiments, the target node generates a key for the communication with the UE. The key can be an integrity key, a confidentiality key or a ciphering key. Exemplarily, the key for the communication with the UE is generated when the UE is allowed to access to the target node.

[0311] In some embodiments, the optional implementation of the key generation can be referred to the corresponding embodiment S2108 of FIG. 2.

[0312] It is worth noting that if the target node does not allow the UE to access, the target node does not need to generate the key. That is, S5104 is an optional step.

[0313] S5105: sending eighth information.

[0314] In some embodiments, the target node sends the eighth information to the core network node.

[0315] In some embodiments, the related description of the eighth information can be referred to the corresponding embodiments of FIG. 2.

[0316] In some embodiments, in the case that the UE needs to switch N2 link when switching from the source node to the target node, the target node sends the eighth information to the core network node, otherwise the target node does not need to send the eighth information to the core network node. For example, the target node refuses the UE to access or the service node switching of the UE does not involve N2 path switch, the target node does not need to send the eighth information to the core network node. That is, S5105 is an optional step.

[0317] As shown in FIG. 6, the embodiments of the present disclosure provide an information processing method, which is executed by a core network node, and the method can include:

[0318] S6101: receiving first information.

[0319] In some embodiments, the core network node receives the first information sent by the first node.

[0320] In some embodiments, the related description of the first information can be referred to the corresponding embodiments of FIG. 2.

[0321] S6102: sending second information.

[0322] In some embodiments, the core network node sends the second information to the first node.

[0323] In some embodiments, the related description of the second information can be referred to the corresponding embodiments of FIG. 2.

[0324] S6103: receiving eighth information.

[0325] In some embodiments, the eighth information sent by the target node when the LTM switching of the UE needs to switch N2 link is received.

[0326] In some embodiments, S6103 can be an optional step. For example, the LTM switching of the UE does not involve N2 link switching, the core network node does not need to receive the eighth information from the target node.

[0327] As shown in FIG. 7, the embodiments of the present disclosure provide an information processing method, which is executed by a UE, and the method can include:

[0328] S7101: receiving third information.

[0329] In some embodiments, the UE can be a UE capable of LTM.

[0330] In some embodiments, the related description of the third information can refer to the corresponding embodiments of FIG. 2.

[0331] S7102: generating second parameters.

[0332] In some embodiments, the UE generates the second parameters according to the third information.

[0333] In some embodiments, the first parameter of the first parameter pair of the second node is generated according to the key of the first node and the identity of the second node, and the first parameter of the first parameter pair of the y+1 node is generated according to the second parameter of the first parameter pair of the y node and the identity of the y+1 node.

[0334] In some embodiments, the second parameter of the first parameter pair of the second node is generated according to the key of the first node and the LTM configuration identity of the second node, and the second parameter of the first parameter pair of the y+1 node is generated according to the second parameter of the first parameter pair of the y node and the LTM configuration identity of the y+1 node.

[0335] In some embodiments, the second parameter of the first parameter pair of the z node is generated according to the key of the first node and the identity of the z node.

[0336] In some embodiments, the second parameter of the first parameter pair of the z node is generated according to the key of the first node and the LTM configuration identity of the z node.

[0337] In some embodiments, the z is a positive integer greater than or equal to 2.

[0338] In some embodiments, the optional implementation manner of the UE generating the second parameters can refer to any one of the optional implementation manners of S2109 of FIG. 2.

[0339] S7103: receiving seventh information.

[0340] In some embodiments, the UE receives the seventh information sent by the source node.

[0341] In some embodiments, the UE receives the seventh information sent by the source node of the LTM switching.

[0342] In some embodiments, the seventh information is used to instruct the UE to switch to the target node. Illustratively, the seventh information can include an identification of the target node or an LTM configuration identification of a cell of the target node. Illustratively, the seventh information is sent by the source node to the UE in a case that the target node allows the UE to access. Illustratively, the seventh information is carried in a Media Access Control (MAC) Control Element (CE) message and sent to the UE.

[0343] In some embodiments, the related description of the seventh information can refer to the corresponding embodiments of FIG. 2.

[0344] S7104: generating a key.

[0345] In some embodiments, the UE generates a key for communication with the target node.

[0346] In some embodiments, the seventh information indicates that the UE is allowed to access the target node, and the UE generates a key for communication with the target node.

[0347] In some embodiments, the optional implementation manner of the UE generating the key can refer to any one of the optional implementation manners of S2109 of FIG. 2.

[0348] It is worth noting that the UE can perform S7102 first and then perform S7103, or perform S7103 first and then perform S7102.

[0349] In some embodiments, S7102 to S7104 are optional steps. For example, the mobility of the UE is poor, and the LTM configuration can be obtained from the network side, or the L1 measurement report triggering the LTM switching can not be sent. However, in the embodiments of the present disclosure, the UE receives the LTM configuration and the first parameter of each candidate node for LTM switching from the first node, which facilitates the UE to generate the second parameter based on the actual accessed target node and generate the key with the target node based on the second parameter. If the UE receives the first parameter of each candidate node from the first node, the UE can generate the second parameter of each candidate node and the first parameter pair in advance, and then the UE can perform S7101 and S7102.

[0350] In order to perform cross-CU LTM enhancement, it is necessary to ensure the synchronization of AS security authentication on the UE side and the network side. According to the enhancement of cross-CU LTM, the RRC configuration of the candidate gNB can be preconfigured by the initial gNB and delivered to the candidate gNB (and the UE in the LTM preparation phase. Since the initial gNB controls the LTM configuration of all other candidate gNBs, it is assumed that the initial gNB is very secure and will not be damaged by attackers, otherwise, the attacker can obtain the configuration of all cross-CU LTM candidate gNBs, including security-related configurations.

[0351] Embodiments of the present disclosure propose a key generation method, in which the AMF generates the NH and NCC for LTM switching across CUs. The NH and NCC for LTM switching across CUs are independent of the NH and NCC for non-LTM switching. Therefore, the NH LTM and NCC LTM for LTM switching across CUs are used to distinguish from the NH and NCC for non-LTM switching. The AMF maintains two pairs of {NH, NCC}. One pair of {NH, NCC} is used for non-LTM switching, and the other pair of {NH LTM ,NCC ltm} is used for LTM switching.

[0352] The master gNB or initial gNB responsible for LTM preparation across CUs requests the LTM configuration from the AMF, and the AMF derives a pair of {NH LTM ,NCC LTM} (e.g., {NH LTM1 ,NCC LTM1}, {NH LTM2 ,NCC LTM2}, etc.) for each candidate gNB. Then, the master / initial gNB sends the pair of {NH LTM ,NCC LTM} to each candidate gNB respectively. In this way, each candidate gNB obtains its own pair of {NH LTM ,NCC LTM}, and cannot know the pair of {NH LTM ,NCC LTM} of other gNBs. The pair of {NH LTM ,NCC LTM} is used for Access Stratum (AS) security key update synchronization. For example, gNB1 has {NH LTM 1,NCC LTM 1}, and gNB2 has {NH LTM 2,NCC LTM 2}. Exemplarily, the master gNB herein is one of the first nodes mentioned above.

[0353] The LTM candidate configuration of all candidate gNBs is sent to the UE. In this way, the UE knows the NCC values assigned to all candidate gNBs. For example, the NCC LTM 1 in the LTM configuration of gNB1, and the NCC LTM 2 in the LTM configuration of gNB2.

[0354] Then, in each LTM switching process across CUs, the serving gNB determines the NCC LTMThe UE determines the NCC used with the target UE according to the configuration of the target node received from the serving gNB LTM , thereby determining NH LTM In this way, the AS security key update synchronization is implemented together with the target node configuration synchronization required for LTM handover, because the NCC LTM1 used for key update synchronization is contained in the target node configuration.

[0355] In addition, since the AMF has derived the {NH LTM ,NCC LTM} pair for all candidate gNBs participating in the LTM handover across CUs, and the {NH LTM ,NCC LTM} pair is independent of the {NH,NCC} pair for non-LTM handover, the AMF does not need to derive a new {NH,NCC} pair for the target gNB in each N2 link switching process for LTM handover across CUs. Therefore, it is recommended that the target gNB include an indication in the N2 path switch request, which indicates that the AMF should not derive a new {NH,NCC} pair for non-LTM handover.

[0356] Figure 8A shows that LTM handover can include:

[0357] 1: The UE is in an RRC connected state, and sends a measurement report to the initial gNB; the initial gNB performs LTM preparation and determines candidate cells and candidate gNBs. 2: LTM request of the initial gNB, for example, the initial gNB sends an LTM request to candidate gNB2, which is a request for the UE to access candidate gNB2 through LTM handover. Candidate gN 21 performs access control.

[0358] 3: Candidate gNB2 sends an LTM request confirmation to initial gNB0. The LTM request confirmation is a representation of allowing the UE to access the target base station.

[0359] 4: LTM configuration generation or modification is performed.

[0360] 5: The initial gNB sends an RRC reconfiguration to the UE, which includes the LTM configuration.

[0361] 6: RRC reconfiguration is completed.

[0362] 7: Early Data Forwarding (EDF).

[0363] As shown in Figure 8B, the information processing method provided by the embodiments of the present disclosure can include:

[0364] 1. LTM preparation between UE, initial / serving gNB0 and AMF. Initial gNB0 informs AMF to participate in LTM handover across CUs, exemplarily, source gNB tells AMF LTM candidate configuration ID of candidate gNBs. AMF derives {NH LTM, NCC LTM} pairs, e.g. {NH LTM 1,NCC LTM 1}, {NH LTM 2,NCC LTM 2}) for all candidate gNBs from the candidate gNB and sends to initial / serving gNB0. Initial / serving gNB0 includes {NH LTM ,NCC LTM} pair values in LTM candidate configuration for each candidate gNB. LTM candidate configuration is identified by target node configuration ID, etc.

[0365] 2. Initial / serving gNB0 sends LTM candidate configuration for all candidate gNBs to UE. The LTM candidate configuration includes NCC LTM values assigned to all candidate gNBs. For example, NCC LTM 1 in LTM configuration of gNB1, NCC LTM 2 in LTM configuration of gNB2.

[0366] 3. Initial / serving gNB0 sends LTM configuration containing NCC LTM values to all candidate gNBs. In addition, initial / serving gNB0 also sends NH configuration to each candidate gNB respectively. NH configuration includes corresponding {NH LTM ,NCC LTM} pairs for AS security key update synchronization. For example, {NH LTM 1,NCC LTM 1} for gNB1, {NH LTM 2,NCC LTM 2} for gNB2.

[0367] LTM handover target node NCCLTM target node 4. UE retrieves NCC LTM values from LTM candidate configuration of all candidate gNBs and derives all corresponding NH LTM values, e.g.:

[0368] NCC LTM 1: KDF<— (K gNB0 , ID1, K AMF );

[0369] NCC LTM 2: KDF<— (NH LTM1 , ID2, KAMF );

[0370] NCC LTM 3:KDF<——(NH LTM2 2, ID3, K AMF )。

[0371] UE stores the derived {NCC LTM 2, NH LTM} pair for future handover.

[0372] 5. When UE moves, send L1 measurement report to initial / serving gNB0.

[0373] 6. After selecting the target gNB (e.g. candidate gNB2), initial / serving gNB0 decides to trigger LTM procedure. Since initial / serving gNB has configured multiple {NH LTM 2, NCC LTM} pairs for candidate gNB, it retrieves {NH LTM 2, NCC LTM 2} pair from the LTM configuration of gNB2 (i.e. {NH LTM 2, NCC LTM}).

[0374] 7. Initial / serving gNB0 sends NCC LTM 2 to candidate gNB2. gNB2 retrieves NH LTM 2 from the received NCC LTM 2, derives K LTM 2 by deriving K NG-RAN* from NH NG-RAN* 2 (e.g. K LTM <— (NH NG-RAN* 2, cell ID, UTC) vertical key derivation. And returns NCC gNB2 2 to initial / serving gNB0 as acknowledgement.

[0375] 8. Initial / serving gNB0 sends MAC CE message to UE, which includes target node configuration ID, e.g. target node configuration ID of gNB2 is 2.

[0376] 9. After receiving MAC CE from initial / serving gNB0, perform step 9.1 and step 9.2.

[0377] 9.1 UE first retrieves LTM configuration of target gNB2 (including NCC LTM 2) according to target node configuration ID.

[0378] 9.2 UE retrieves NCC LTM2 2 derived in step 4.LTM2 Corresponding NH LTM 2, and derives K NG-RAN* (i.e., K LTM 2, cell ID, UTC) for vertical key derivation.

[0379] 9.3 The UE detaches from the initial / serving gNB 0, applies the configuration of the target gNB 2, including the K NG-RAN* as K gNB2 used with gNB 2.

[0380] 10. The UE sends an RRC Reconfiguration Complete message to gNB 2. The protection is based on K gNB2

[0381] 11. gNB 2 sends N2 Path Switch Request to AMF with indication of LTM switch or no NH derivation. When the AMF receives the N2 Path Switch Request message with indication of LTM switch or no NH derivation, the AMF decides not to derive a new {NH, NCC} pair for gNB 2 as non-LTM switch.

[0382] 12. The UE sends L1 measurement report to the serving / source gNB 2 (gNB 2) during mobility.

[0383] 13. After selecting the target gNB (candidate gNB 1), the serving gNB (gNB 2) decides to trigger the LTM procedure. Since the serving / source gNB 2 obtained the LTM configuration from the initial gNB 0, it retrieves the {NH LTM 1, NCC LTM 1} pair from the LTM configuration of gNB 1.

[0384] 14. The serving gNB 2 sends NCC LTM 1 to candidate gNB 1. gNB 1 retrieves NH LTM 1 from the received NCC LTM 1, derives K NG-RAN* from NH NG-RAN* 1 (e.g., K LTM <——(NH NG-RAN* 1, cell ID, UTC)), and uses K gNB1 as K LTM . The NCC value (NCC LTM 1) is then returned to gNB 2 as an acknowledgement. The target node

[0385] ​15. gNB2 sends a MAC CE message to the UE, which contains the target Cell Config ID (e.g. target Cell Config ID of gNB1 is 1).

[0386] 16. Upon receiving the MAC CE from gNB2, the UE can include step 16.1 and step 16.2.

[0387] 16.1. The UE first retrieves the target gNB1 (containing the LTM configuration of NCC LTM 1) of gNB1 according to the target Cell Config ID.

[0388] 16.2. The UE obtains the NCC LTM1 1 derived in step 4, and derives the NH LTM 1 by deriving K NG-RAN* ( i.e. KNG-RAN*<—NH LTM 1, cell ID, UTC).

[0389] 16.3. The UE disconnects from gNB2 and applies the configuration of target gNB2, including using K NG-RAN* as K gNB1 together with gNB1.

[0390] 17. The UE sends the RRC Reconfiguration Complete message to gNB1 protected with K gNB1 .

[0391] 18. gNB1 sends a N2 Path Switch Request to the AMF. The N2 Path Switch Request can include an indication of LTM switching or no NH derivation. When the AMF receives the N2 Path Switch Request message with the indication of LTM switching or no NH derivation, the AMF decides not to derive a new {NH, NCC} pair for gNB1 for non-LTM switching. The non-LTM switching can include an existing node switch.

[0392] 19. The UE sends L1 measurement report to the serving / source gNB1 during mobility.

[0393] 20. After selecting the target gNB (going back to gNB2), the serving gNB (gNB1) decides to trigger the LTM procedure and retrieves NCC LTM 2 from the LTM configuration of gNB2.

[0394] 21. gNB1 sends NCC LTM 2 to gNB2. gNB2 retrieves NH LTM 2 according to the received NCC LTM 2, and derives K LTM 2 from NH NG-RAN*(i.e. K) NG-RAN* <——(NH LTM2 Perform vertical key derivation using cell ID, UTC, and set K NG-RAN* As K gNB2 Then the NCC value (NCC) LTM 2) A confirmation is returned to gNB1. Step 21 may include: 21a: gNB1 sends a handover request to gNB2; 21b: gNB2 uses NCC... LTM 2. Obtain NH LTM 2. And derive the key K for communication with the UE. NG-RAN* 21c: gNB2 sends a handover request confirmation to gNB1. Exemplarily, this handover request confirmation includes NCC (Network Control Center) confirmation. LTM 2.

[0395] Note: K has already been exported in step 7b by gNB2. gNB2 Compare the key derivation input parameters in steps #7b and #21b. Except for the counter for the base UTC, the parameter values ​​are the same. Since UTC is time-based, the value at step 7b differs from the value at step 21b; therefore, the K derived at service / source 21b... gNB2 Compared to the K previously exported at business / source 7b gNB2 Different. This avoids the UE using the same K when it resides on the same gNB at different times. gNB .

[0396] 22.gNB1 sends a MAC CE message to the UE, which contains the target Cell Config ID 2.

[0397] 23. Same as step 9. The only difference is that K is derived in step 23. gNB2 Compared to K exported in step 9 above gNB2 The difference is because the UTC value has changed.

[0398] 24. Same as step 10. The only difference is that this step is used to protect K. gNB2 K used for protection in step #10 gNB2 different.

[0399] 25. Same as step 11. To make NH LTM Independent of the NH used for legacy transfer, it is proposed to define a different KDF to derive the NH. LTM From K AMF Export NH LTM When using KDF, the following parameters should be used as input:

[0400] Fc = Pending

[0401] P0 = SYNC - input;

[0402] L0 = length of SYNC - input;

[0403] P1 = candidate node ID or LTM configuration ID;

[0404] L1 = length of candidate node ID or length of LTM configuration ID.

[0405] Exemplarily, the SYNC - input parameter should be the initial NH LTM derived new K gNB， and all subsequent NH LTM derived from the previous NH LTM . This previous NH LTM is the NH LTM of the previous base station. In this way, the NH LTM of multiple handover base stations of the UE will form a NH LTM chain, in which the next NH LTM is always new, and the next NH LTM is derived from the previous NH LTM . The main difference of this KDF from the traditional NH derivation KDF is the additional input parameter (P1, L1) of LTM configuration ID, which is used to associate the NH LTM with the specific gNB performing LTM handover across CUs.

[0406] The input key of the KDF should be the 256-bit K AMF .

[0407] In another scenario, the NH LTM may not always be derived from the previous NH LTM , because in the LTM preparation phase, the values of NH LTM are pre-configured on the UE and candidate gNBs. When the initial gNB configures the {NH LTM , NCC LTM} pair for the UE and candidate gNBs, since the handover sequence of UE movement cannot be predicted in the preparation phase, the order of gNBs actually accessed by the UE or the order of NH LTM used cannot be determined. Therefore, K gNB0 is used as the SYNC - input parameter, that is, the key is generated in the following way:

[0408] Fc = To Be Determine (TBD);

[0409] P0 = K gNB0 ;

[0410] L0 = K gNB0length of the candidate node ID or the length of the LTM configuration ID;

[0411] P1 = candidate node ID or LTM configuration ID;

[0412] L1 = length of the candidate node ID or the length of the LTM configuration ID;

[0413] The input key to the KDF is still the 256-bit K AMF .

[0414] The AMF should be able to derive NCC LTM from the candidate gNB's cross-CU LTM candidate configuration ID LTM . LTM The AMF should be able to send the derived {NH

[0415] The AMF should be able to derive and maintain two {NH, NCC} pairs; one for LTM handover and one for non-LTM handover. That is, the derivation of the {NH LTM , NCC LTM} pair for LTM handover is different from the derivation of the {NH, NCC} pair for legacy handover.

[0416] When the N2 path switch request from the gNB contains an indication of LTM handover or no derivation of NH, the AMF should be able to decide not to derive a new {NH, NCC} pair for the gNB.

[0417] In some embodiments, the gNB can perform at least one of the following:

[0418] The initial or source gNB should be able to request the AMF to derive NCC LTM for all candidate gNBs for LTM enhancements.

[0419] The gNB should be able to send the NH configuration to all candidate gNBs separately.

[0420] The gNB should be able to provide the UE with the LTM candidate configuration of all candidate gNBs containing NCC LTM .

[0421] The source gNB should be able to determine the NH LTM used by the target gNB from the target gNB's configuration.

[0422] The target gNB should be able to retrieve the configured NH LTM from the NCC LTM provided from the source base station.

[0423] The base station should be able to derive K NG-RAN* from the current UTC value.

[0424] The gNB shall be able to include the LTM handover indication or no NH derivation indication in the N2 path switch request. Exemplarily, the LTM handover indication or no NH derivation indication is one of the aforementioned first indications, i.e., for informing the core network node (e.g., AMF) not to generate the second parameter pair.

[0425] The UE performs at least one of the following operations:

[0426] In the LTM preparation phase, the UE shall be able to obtain the value of NCC LTM from the LTM candidate configuration of all candidate gNBs and derive the corresponding value of NH LTM .

[0427] The UE shall be able to obtain the LTM configuration of the target gNB based on the LTM candidate configuration ID of each candidate gNB.

[0428] The UE shall be able to obtain the node ID or LTM configuration ID of the target base station according to the received MAC CE.

[0429] The UE shall be able to retrieve the corresponding NH LTM from the NCC LTM in the LTM configuration of the target gNB and perform vertical key derivation.

[0430] The UE shall be able to derive K NG-RAN* based on the current UTC value.

[0431] In the embodiments of the present disclosure, part or all of the steps, and optional implementation manners thereof, can be combined with part or all of the steps in other embodiments, or can be combined with optional implementation manners of other embodiments.

[0432] In the embodiments of the present disclosure, part or all of the steps, and optional implementation manners thereof, can be combined with part or all of the steps in other embodiments, or can be combined with optional implementation manners of other embodiments.

[0433] The embodiments of the present disclosure also provide a device for implementing any one of the above methods, for example, providing a device, the above device includes units or modules for implementing each step performed by the UE in any one of the above methods. For another example, another device is also provided, which includes units or modules for implementing each step performed by the network device (e.g., an access network device, or a core network device, etc.) in any one of the above methods.

[0434] It should be understood that the division of each unit or module in the above apparatus is only a logical function division, and all or part of them can be integrated into a physical entity or physically separated in actual implementation. In addition, the units or modules in the apparatus can be implemented in the form of processor calling software: for example, the apparatus includes a processor connected with a memory, the memory stores instructions, and the processor calls the instructions stored in the memory to implement any of the above methods or realize the functions of each unit or module of the above apparatus, wherein the processor is, for example, a general processor such as a central processing unit (CPU) or a microprocessor, and the memory is a memory in the apparatus or a memory outside the apparatus. Alternatively, the units or modules in the apparatus can be implemented in the form of hardware circuit, and the functions of part or all of the units or modules can be realized by the design of the hardware circuit. The above hardware circuit can be understood as one or more processors; for example, in one implementation, the above hardware circuit is an application-specific integrated circuit (ASIC), and the functions of part or all of the above units or modules are realized by the design of the logical relationship of the elements in the circuit; for example, in another implementation, the above hardware circuit is a programmable logic device (PLD), and a field programmable gate array (FPGA) is taken as an example, which can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by a configuration file, so as to realize the functions of part or all of the above units or modules. All units or modules of the above apparatus can be implemented in the form of processor calling software, or all units or modules can be implemented in the form of hardware circuit, or part of the units or modules are implemented in the form of processor calling software, and the remaining part is implemented in the form of hardware circuit.

[0435] In embodiments of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor can be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), a digital signal processor (DSP), etc. In another implementation, the processor can implement certain functions through a logical relationship of hardware circuit, and the logical relationship of the 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 the reconfigurable hardware circuit, the processor loads a configuration document to implement the configuration of the hardware circuit. It can be understood that the processor loads instructions to implement the functions of the above part or all units or modules. In addition, the hardware circuit can also be 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.

[0436] As shown in FIG. 9A, embodiments of the present disclosure provide a first node, comprising:

[0437] The sending module 9101 is configured to send first information to a core network node, wherein the first information comprises information of candidate nodes for layer 1 and / or layer 2 triggered mobility (LTM) switching.

[0438] The receiving module 9102 is configured to receive second information sent by the core network node, wherein the second information comprises a first parameter pair of each of the candidate nodes; the first parameter pair comprises a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes is used to determine the second parameter of the nth node; the second parameter is used to determine a key for communication between a user equipment (UE) and the nth node; and n is a positive integer greater than or equal to 2.

[0439] In some embodiments, the sending module and / or the receiving module can correspond to a network interface and / or a transceiving antenna of the first node.

[0440] In some embodiments, the first node further comprises a processing module.

[0441] In some embodiments, the processing module can be configured to perform information processing related steps in any one of the information processing methods.

[0442] In some embodiments, the sending module can be configured to perform information sending related steps in any one of the information processing methods.

[0443] In some embodiments, the receiving module can be configured to perform information sending related steps in any one of the information processing methods.

[0444] In some embodiments, the sending module is further configured to send third information to the UE, the third information comprising at least LTM configurations of the candidate nodes; the LTM configuration of the nth node comprising at least a configuration identifier of the nth node; or the LTM configuration of the nth node comprising at least the configuration identifier of the nth node and a first parameter of the nth node.

[0445] In some embodiments, the sending module is further configured to send fourth information to the candidate nodes, the fourth information sent to the nth node comprising at least a second parameter of the nth node.

[0446] In some embodiments, the fourth information sent to the nth node further comprises a first parameter of the candidate nodes.

[0447] As shown in FIG. 9B, the embodiments of the present disclosure provide a source node, which comprises:

[0448] The sending module 9201 is configured to send fifth information to a target node, the fifth information being used to make the target node generate a key for communication with a UE using a second parameter of a first parameter pair of LTM switching pre-configured by a core network node.

[0449] In some embodiments, the source node can further comprise a processing module and / or a receiving module.

[0450] In some embodiments, the sending module and / or the receiving module can correspond to a network interface and / or a transceiving antenna of the source node.

[0451] In some embodiments, the processing module can be configured to perform information processing related steps in any one of the information processing methods.

[0452] In some embodiments, the sending module can be configured to perform information sending related steps in any one of the information processing methods.

[0453] In some embodiments, the receiving module can be configured to receive the sixth information sent by the target node, wherein the sixth information is used to indicate whether the target node allows the UE to access.

[0454] In some embodiments, the receiving module is further configured to receive sixth information sent by the target node, wherein the sixth information is used to indicate whether the target node allows the UE to access.

[0455] In some embodiments, the sending module is further configured to send seventh information to the UE, wherein the seventh information is used to indicate that the UE accesses the target node.

[0456] In some embodiments, the fifth information comprises first parameters of the target node, wherein the first parameters of the target node are used by the target node to determine a second parameter in the first parameters to generate a key for communication with the UE.

[0457] As shown in FIG. 9C, the embodiments of the present disclosure provide a target node, which can comprise:

[0458] The receiving module 9301 is configured to receive fourth information sent by a first node, wherein the fourth information comprises at least second parameters of a target node in Layer 1 and / or Layer 2 trigger mobility (LTM) switching of a user equipment (UE), wherein the target node is one of candidate nodes of LTM of the UE, and wherein the second parameters of the target node are used to determine a key for communication between the target node and the UE.

[0459] In some embodiments, the target node can further comprise a processing module and / or a sending module.

[0460] In some embodiments, the sending module and / or the receiving module can correspond to a network interface and / or a transceiving antenna of a network node.

[0461] In some embodiments, the processing module can be configured to perform information processing related steps in any one of the information processing methods.

[0462] In some embodiments, the sending module can be configured to perform information sending related steps in any one of the information processing methods.

[0463] In some embodiments, the receiving module can be configured to perform information sending related steps in any one of the information processing methods.

[0464] In some embodiments, the fourth information further comprises first parameters of each candidate node in LTM switching of the UE.

[0465] In some embodiments, the receiving module is configured to receive fifth information sent by a source node, wherein the fifth information comprises first parameters of each candidate node in LTM switching of the UE.

[0466] The processing module is configured to determine, according to the fifth information, a key for communication between the UE and the target node using the second parameter of the target node.

[0467] In some embodiments, the sending module is configured to send, to the source node, sixth information, where the sixth information is used to indicate that the UE is allowed to access the target node.

[0468] In some embodiments, the fifth information includes a first parameter of the target node; and the first parameter of the target node and the second parameter of the target node constitute a first parameter pair of the target node.

[0469] In some embodiments, the processing module is further configured to generate, according to the second parameter of the first parameter pair of the target node, a key for communication between the UE and the target node; or generate, according to the second parameter of the first parameter pair of the target node and time information of the UE accessing the target node, a key for communication between the UE and the target node.

[0470] In some embodiments, the sending module is further configured to send, to a core network node, eighth information in a case that the UE needs N2 link change when switching from the source node to the target node; the eighth information includes a first indication; and the first indication is used to indicate that the core network node does not need to generate a second parameter pair for the UE, where the second parameter pair is used for non-LTM switching of the UE.

[0471] As shown in FIG. 9D, the embodiments of the present disclosure provide a core network node, which includes:

[0472] The receiving module 9401 is configured to receive first information sent by a first node, where the first information includes information of candidate nodes of layer 1 and / or layer 2 triggered mobility (LTM) switching of a UE;

[0473] The sending module 9402 is configured to send, to the first node, second information, where the second information includes a first parameter pair of each of the candidate nodes; the first parameter pair includes a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes is used to determine the second parameter of the nth node; the second parameter is used to determine a key for communication between a user equipment (UE) and the nth node; and n is a positive integer greater than or equal to 2.

[0474] In some embodiments, the core network node can further include a processing module.

[0475] In some embodiments, the sending module and / or the receiving module can correspond to a network interface and / or a transceiving antenna of the network node.

[0476] In some embodiments, the processing module can be configured to perform, by the core network node, steps related to information processing in any one of the information processing methods.

[0477] In some embodiments, the sending module can be configured to perform, by the core network node, steps related to information sending in any one of the information processing methods.

[0478] In some embodiments, the receiving module can be configured to perform, by the core network node, steps related to information sending in any one of the information processing methods.

[0479] In some embodiments, the processing module is configured to generate, according to a key of the first node and an identifier of a second node, a second parameter of a first parameter pair of the second node, and generate, according to the second parameter of the first parameter pair of the yth node and an identifier of the y+1th node, a second parameter of a first parameter pair of the y+1th node; or, generate, according to the key of the first node and an LTM configuration identifier of the second node, the second parameter of the first parameter pair of the second node, and generate, according to the second parameter of the first parameter pair of the yth node and an LTM configuration identifier of the y+1th node, the second parameter of the first parameter pair of the y+1th node; the y is a positive integer greater than or equal to 2.

[0480] In some embodiments, the processing module is configured to generate, according to a key of the first node and an identifier of the zth node, a second parameter of a first parameter pair of the zth node; or, generate, according to the key of the first node and an LTM configuration identifier of the zth node, the second parameter of the first parameter pair of the zth node; the z is a positive integer greater than or equal to 2.

[0481] In some embodiments, the receiving module is configured to receive eighth information sent by a target node of the UE for LTM switching, the eighth information including a first indication; wherein the eighth information includes the first indication; the first indication is used to indicate that the core network node does not need to generate a second parameter pair for the UE, the second parameter pair being used for non-LTM switching of the UE.

[0482] In some embodiments, the first indication is an LTM switching indication or a no-derivation indication.

[0483] In some embodiments, the core network node is further configured with a second parameter pair for the nth node; the second parameter pair is used for non-LTM switching of the UE.

[0484] As shown in FIG. 9E, the embodiments of the present disclosure provide a UE, which can include:

[0485] The receiving module 9501 is configured to receive third information sent by the first node; the third information at least includes LTM configuration of layer 1 and / or layer 2 triggered mobility LTM of the UE; the LTM configuration of the nth node at least includes configuration identification of the nth node; or the LTM configuration of the nth node at least includes the configuration identification of the nth node and the first parameter of the nth node; n is a positive integer greater than or equal to 2.

[0486] In some embodiments, the UE can further include a sending module and / or a processing module.

[0487] In some embodiments, the sending module and / or the receiving module can correspond to a network interface and / or a transceiving antenna of the UE.

[0488] In some embodiments, the processing module can be used by the UE to perform steps related to information processing in any one of the information processing methods.

[0489] In some embodiments, the sending module can be used by the UE to perform steps related to information sending in any one of the information processing methods.

[0490] In some embodiments, the processing module is configured to generate the first parameter of the first parameter pair of the second node according to the key of the first node and the identification of the second node; generate the first parameter of the first parameter pair of the y+1th node according to the second parameter of the first parameter pair of the yth node and the identification of the y+1th node; or generate the second parameter of the first parameter pair of the second node according to the key of the first node and the LTM configuration identification of the second node, and generate the second parameter of the first parameter pair of the y+1th node according to the second parameter of the first parameter pair of the yth node and the LTM configuration identification of the y+1th node; y is a positive integer greater than or equal to 2.

[0491] In some embodiments, the processing module is configured to generate the second parameter of the first parameter pair of the zth node according to the key of the first node and the identification of the zth node; or generate the second parameter of the first parameter pair of the zth node according to the key of the first node and the LTM configuration identification of the zth node; z is a positive integer greater than or equal to 2.

[0492] In some embodiments, the receiving module is configured to receive seventh information sent by the source node of LTM switching, the seventh information being used to indicate that the UE switches to a target node; and the processing module is configured to determine a key of the UE communicating with the target node at least according to the second parameter of the first parameter pair of the target node.

[0493] In some embodiments, the processing module is configured to determine the key for the UE to communicate with the target node according to the second parameter of the first parameter pair of the target node; or determine the key for the UE to communicate with the target node according to the second parameter of the first parameter pair of the target node and time information of the UE accessing to the target node.

[0494] The embodiments of the present disclosure also provide a communication device, which can include one or more processors; wherein the processor is configured to invoke instructions to enable the communication device to perform the information processing method implemented by any one of the preceding embodiments.

[0495] In some embodiments, as shown in FIG. 10A and / or FIG. 10B, the communication device 8100 further includes one or more memories 8102 for storing instructions. Alternatively, all or part of the memory 8102 can also be outside the communication device 8100.

[0496] The communication device can be the UE and the network device as described above. In some embodiments, the network device can be the master node and / or the secondary node.

[0497] In some embodiments, the communication device 8100 further includes one or more transceivers 8103. When the communication device 8100 includes one or more transceivers 8103, the communication steps in the above method, such as sending and receiving, are performed by the transceiver 8103, and the other steps are performed by the processor 8101.

[0498] In some embodiments, the transceiver can include a receiver and a transmitter, which can be separate or integrated together. Alternatively, the terms transceiver, transceiving unit, transceiver, transceiving circuit, etc. can be replaced by each other, the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc. can be replaced by each other, and the terms receiver, receiving unit, receiver, receiving circuit, etc. can be replaced by each other.

[0499] Alternatively, the communication device 8100 further includes one or more interface circuits 8104, which are connected with the memory 8102, and can be used to receive signals from the memory 8102 or other devices, and can be used to send signals to the memory 8102 or other devices. For example, the interface circuit 8104 can read the instructions stored in the memory 8102 and send the instructions to the processor 8101.

[0500] The communication device 8100 described in the above embodiments can be a network device or a UE, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 can not be limited by FIG. 10A. The communication device can be a standalone device or can be part of a larger device. For example, the communication device can be: (1) a standalone integrated circuit (IC), or a chip, or a chip system or subsystem; (2) a set of one or more ICs, which can optionally also include storage components for storing data, programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a UE device, a smart UE device, a cellular phone, a wireless device, a handset, a mobile unit, a car-mounted device, a network device, a cloud device, an artificial intelligence device, and the like; (6) other devices, and the like.

[0501] FIG. 10B is a structural schematic diagram of a chip 8200 according to an embodiment of the present disclosure. For the case where the communication device 8100 is a chip or a chip system, the structural schematic diagram of the chip 8200 shown in FIG. 10B can be referred to, but is not limited thereto.

[0502] The chip 8200 includes one or more processors 8201 for invoking instructions to cause the chip 8200 to perform any of the above information processing methods.

[0503] In some embodiments, the chip 8200 further includes one or more interface circuits 8202 connected with the memory 8203, which can be used to receive signals from the memory 8203 or other devices, and can be used to send signals to the memory 8203 or other devices. For example, the interface circuit 8202 can read instructions stored in the memory 8203 and send the instructions to the processor 8201. Alternatively, the terms interface circuit, interface, transceiver pin, and transceiver can be replaced with each other.

[0504] In some embodiments, the chip 8200 further includes one or more memories 8203 for storing instructions. Alternatively, all or part of the memory 8203 can be outside the chip 8200.

[0505] The present disclosure also provides a storage medium having instructions stored thereon, which, when executed on the communication device 8100, cause the communication device 8100 to perform any of the above methods. Alternatively, the storage medium is an electronic storage medium. Alternatively, the storage medium is a computer-readable storage medium, but can also be a storage medium readable by other devices. Alternatively, the storage medium can be a non-transitory storage medium, but can also be a transitory storage medium.

[0506] This disclosure also provides a program product, which, when executed by a communication device 8100, causes the communication device 8100 to perform any of the above information processing methods. Optionally, the program product is a computer program product.

[0507] This disclosure also provides a computer program that, when run on a computer, causes the computer to perform any of the above information processing methods.

[0508] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the embodiments of this disclosure that follow the general principles of the embodiments of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the embodiments of this disclosure are indicated by the following claims.

[0509] It should be understood that the embodiments disclosed herein are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments disclosed herein is limited only by the appended claims.

Claims

1. An information processing method, wherein, The method performed by a first node comprises: sending first information to a core network node, the first information comprising information of candidate nodes for layer 1 and / or layer 2 triggered mobility (LTM) switching; receiving second information sent by the core network node, the second information comprising a first parameter pair of each of the candidate nodes; the first parameter pair comprising a first parameter and a second parameter; the first parameter of an nth node of the candidate nodes being used to determine the second parameter of the nth node; the second parameter being used to determine a key for communication between a user equipment (UE) and the nth node; n being a positive integer greater than or equal to 2.

2. The method of claim 1, wherein, The method further comprises: sending third information to the UE, the third information comprising at least an LTM configuration of each of the candidate nodes; the LTM configuration of the nth node comprising at least a configuration identifier of the nth node; or the LTM configuration of the nth node comprising at least the configuration identifier of the nth node and the first parameter of the nth node.

3. The method of claim 1 or 2, wherein, The method further comprises: sending fourth information to each of the candidate nodes, the fourth information sent to the nth node comprising at least the second parameter of the nth node.

4. The method of claim 3, wherein, The fourth information sent to the nth node further comprises the first parameter of each of the candidate nodes.

5. An information processing method, wherein, The method performed by a source node for layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE) comprises: sending fifth information to a target node, the fifth information being used for enabling the target node to generate a key for communication with the UE based on a second parameter of a first parameter pair; the first parameter pair being pre-configured by a core network node.

6. The method of claim 5, wherein, The method further comprises: receiving sixth information sent by the target node; the sixth information being used for indicating whether the target node allows access of the UE.

7. The method of claim 5 or 6, wherein, The method further comprises sending seventh information to the UE, the seventh information being used for indicating that the UE accesses the target node.

8. The method according to any one of claims 5 to 7, wherein, The fifth information comprises a first parameter of the target node; the first parameter of the target node being used by the target node to determine the second parameter in the first parameter pair; the second parameter of the first parameter pair being used by the target node to generate the key for communication with the UE.

9. An information processing method, wherein, The method performed by the target node further comprises: receiving fourth information sent by a first node, the fourth information comprising at least a second parameter of the target node for layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE); the target node being one of candidate nodes for LTM of the UE; the second parameter of the target node being used to determine a key for communication between the target node and the UE.

10. The method of claim 9, wherein, The fourth information further comprises a first parameter of each of the candidate nodes for LTM switching of the UE.

11. The method of claim 9 or 10, wherein, The method further comprises: receiving fifth information sent by a source node; determining the key for communication with the UE using the second parameter of the target node according to the fifth information.

12. The method of claim 11, wherein, The method further comprises: sending sixth information to the source node, the sixth information being used for indicating that the UE is allowed to access the target node.

13. The method of claim 11 or 12, wherein, The fifth information includes a first parameter of the target node; and the first parameter of the target node and a second parameter of the target node constitute a first parameter pair of the target node.

14. The method according to any one of claims 11 to 13, wherein, The method further includes: generating a key for communication with the UE according to the second parameter of the first parameter pair of the target node; or generating a key for communication with the UE according to the second parameter of the first parameter pair of the target node and time information of the UE accessing the target node.

15. The method according to any one of claims 12 to 14, wherein, The method further includes: in a case where N2 link change is needed when the UE switches from the source node to the target node, sending eighth information to a core network node; the eighth information includes a first indication; the first indication is used to indicate that the core network node does not need to generate a second parameter pair for the UE, and the second parameter pair is used for non-LTM switching of the UE.

16. An information processing method, wherein, The method is performed by a core network node, and includes: receiving first information sent by a first node, the first information including information of candidate nodes of layer 1 and / or layer 2 trigger mobility (LTM) switching of a UE; sending second information to the first node, the second information including first parameter pairs of the candidate nodes; the first parameter pair includes a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes is used to determine the second parameter of the nth node; the second parameter is used to determine a key for communication between a user equipment (UE) and the nth node; n is a positive integer greater than or equal to 2.

17. The method of claim 16, wherein, The method further includes: generating the second parameter of the first parameter pair of the second node according to the key of the first node and the identifier of the second node, and generating the second parameter of the first parameter pair of the (y+1)th node according to the second parameter of the first parameter pair of the yth node and the identifier of the (y+1)th node; or generating the second parameter of the first parameter pair of the second node according to the key of the first node and the LTM configuration identifier of the second node, and generating the second parameter of the first parameter pair of the (y+1)th node according to the second parameter of the first parameter pair of the yth node and the LTM configuration identifier of the (y+1)th node; y is a positive integer greater than or equal to 2.

18. The method of claim 17, wherein, The method further includes: generating the second parameter of the first parameter pair of the zth node according to the key of the first node and the identifier of the zth node; or generating the second parameter of the first parameter pair of the zth node according to the key of the first node and the LTM configuration identifier of the zth node; z is a positive integer greater than or equal to 2.

19. The method of any one of claims 16 to 18, wherein, The method further includes: receiving eighth information sent by a target node of LTM switching of the UE, the eighth information including a first indication; wherein the eighth information includes a first indication; the first indication is used to indicate that the core network node does not need to generate a second parameter pair for the UE, and the second parameter pair is used for non-LTM switching of the UE.

20. The method of claim 19, wherein, The first indication is an LTM switching indication or a no derivation indication.

21. The method of any one of claims 16 to 20, wherein, The core network node further configures the nth node with a second parameter pair; the second parameter pair is used for non-LTM switching of the UE.

22. An information processing method, wherein, The method is performed by a user equipment (UE), and includes: receive third information sent by the first node; the third information at least includes LTM configuration of layer 1 and / or layer 2 triggered mobility LTM switching of the UE; the LTM configuration of the nth node at least includes configuration identification of the nth node; or, the LTM configuration of the nth node at least includes: the configuration identification of the nth node and the first parameter of the nth node; the n is a positive integer greater than or equal to 2.

23. The method of claim 22, wherein, The method further comprises: generating the first parameter of the first parameter pair of the second node according to the key of the first node and the identification of the second node; generating the first parameter of the first parameter pair of the y+1th node according to the second parameter of the first parameter pair of the yth node and the identification of the y+1th node; or, generating the second parameter of the first parameter pair of the second node according to the key of the first node and the LTM configuration identification of the second node; generating the second parameter of the first parameter pair of the y+1th node according to the second parameter of the first parameter pair of the yth node and the LTM configuration identification of the y+1th node; The y is a positive integer greater than or equal to 2.

24. The method of claim 22, wherein, The method further comprises: generating the second parameter of the first parameter pair of the zth node according to the key of the first node and the identification of the zth node; or, generating the second parameter of the first parameter pair of the zth node according to the key of the first node and the LTM configuration identification of the zth node; The z is a positive integer greater than or equal to 2.

25. The method of any one of claims 22 to 24, wherein, The method further comprises: receiving seventh information sent by the source node of LTM switching, the seventh information being used for indicating that the UE switches to a target node; determining the key of the UE and the target node in communication according to at least the second parameter of the first parameter pair of the target node.

26. The method of claim 25, wherein, The determination of the key of the UE and the target node in communication according to at least the second parameter of the first parameter pair of the target node can comprise: determining the key of the UE and the target node in communication according to the second parameter of the first parameter pair of the target node; or, determining the key of the UE and the target node in communication according to the second parameter of the first parameter pair of the target node and time information of the UE accessing to the target node.

27. A first node, wherein, The first node comprises: a sending module configured to send first information to a core network node, the first information including information of candidate nodes of layer 1 and / or layer 2 triggered mobility LTM switching; a receiving module configured to receive second information sent by the core network node, the second information including first parameter pairs of the candidate nodes; the first parameter pair including a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes being used for determining the second parameter of the nth node; the second parameter being used for determining the key of communication between a user equipment UE and the nth node; the n being a positive integer greater than or equal to 2.

28. A source node of a layer 1 and / or layer 2 triggered mobility, LTM, handover of a user equipment, UE, wherein, The source node comprises: a sending module configured to send fifth information to a target node, the fifth information being used for enabling the target node to generate the key of communication with the UE based on the second parameter of the first parameter pair; the first parameter pair being pre-configured by a core network node.

29. A target node, wherein, The target node comprises: a receiving module configured to receive fourth information sent by the first node, the fourth information comprising at least a second parameter of the target node in layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE); the target node being one of candidate nodes of the LTM of the UE; and the second parameter of the target node being used to determine a key for communication between the target node and the UE.

30. A core network node, wherein, The core network node comprises: a receiving module configured to receive first information sent by the first node, the first information comprising information of candidate nodes in layer 1 and / or layer 2 triggered mobility (LTM) switching of a UE; a sending module configured to send second information to the first node, the second information comprising a first parameter pair of each of the candidate nodes; the first parameter pair comprising a first parameter and a second parameter; the first parameter of an nth node in the candidate nodes being used to determine the second parameter of the nth node; and the second parameter being used to determine a key for communication between a user equipment (UE) and the nth node; n being a positive integer greater than or equal to 2.

31. A user equipment (UE), wherein, The UE comprises: a receiving module configured to receive third information sent by the first node; the third information comprising at least LTM configuration in layer 1 and / or layer 2 triggered mobility (LTM) switching of the UE; the LTM configuration of the nth node comprising at least a configuration identifier of the nth node; or the LTM configuration of the nth node comprising at least the configuration identifier of the nth node and a first parameter of the nth node; n being a positive integer greater than or equal to 2.

32. A communication system, wherein, The communication system comprises a first node, a source node in layer 1 and / or layer 2 triggered mobility (LTM) switching of a user equipment (UE), a target node, a core network node and the UE; the first node being configured to perform the method in any one of claims 1 to 4; The source node is configured to perform the method in any one of claims 5 to 8; The target node is configured to perform the method in any one of claims 9 to 15; The core network node is configured to perform the method in any one of claims 16 to 21; The UE is configured to perform the method in any one of claims 22 to 26.

33. A communications device, comprising: The communication device comprises: one or more processors; The processor is configured to invoke instructions to enable the communication device to perform the information processing method in any one of claims 5 to 8, 9 to 15, 16 to 21 or 22 to 26.

34. A storage medium, wherein, The storage medium stores instructions, which, when executed on a communication device, enable the communication device to perform the information processing method in any one of claims 5 to 8, 9 to 15, 16 to 21 or 22 to 26.

35. A program product, wherein, The program product comprises a computer program, which, when executed on a communication device, enables the communication device to implement the information processing method in any one of claims 5 to 8, 9 to 15, 16 to 21 or 22 to 26.

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