CN-122002280-A - Network switching method, terminal and network side equipment

Abstract

The application discloses a network switching method, a terminal and network side equipment, belonging to the technical field of communication, wherein the method of the embodiment of the application is applied to a scene that the terminal is switched from first network equipment to second network equipment; the terminal determines a first key according to the first key derivation indication, and determines a second key according to the first key and a first parameter, wherein the second key is used for communication between the terminal and the second network equipment.

Inventors

• HU LI
• SUN XIAODONG
• QIN FEI

Assignees

• 维沃移动通信有限公司

Dates

Publication Date

20260508

Application Date

20241108

Claims (20)

1. 1. A method of network switching applied to a scenario in which a terminal is switched from a first network device to a second network device, the method comprising: The terminal receives a first key derivation instruction from the first network device; the terminal determines a first key according to the first key derivation indication; and the terminal determines a second key according to the first key and the first parameter, wherein the second key is used for communication between the terminal and the second network equipment.
2. 2. The method of claim 1, wherein the first parameter is a parameter that is not transmitted through the first network device.
3. 3. The method of claim 1 or 2, wherein the first parameter comprises at least one of: A random access preamble identifier; An index value of the timing advance TA; Uplink authorization; A cell radio network temporary identifier C-RNTI; scrambling the identification; terminal position information; Energy state information; a second parameter, the second parameter being determined based on a random access preamble, or the second parameter comprising the random access preamble; a first random number or a second random number, wherein the first random number is determined by the terminal and the second random number is determined by the second network device.
4. 4. A method as claimed in claim 3, wherein the method further comprises: the terminal sends a third parameter to the second network device; wherein the third parameter comprises at least one of: the second parameter; The first random number.
5. 5. A method as claimed in claim 3, wherein the method further comprises: The terminal receives a fourth parameter from the second network device; wherein the fourth parameter comprises at least one of: the random access preamble identifier; An index value of the TA; The uplink authorization; the C-RNTI; The scrambling identification; the terminal position information; The energy state information; The second random number.
6. 6. The method according to claim 4 or 5, wherein the third parameter is transmitted by a random access message and/or the fourth parameter is transmitted by a random access response message.
7. 7. The method according to any of claims 1-6, wherein the terminal determining a first key from the first key derivation indication comprises: And under the condition that the first key derivation indication is a next hop link counter NCC, the terminal determines the first key according to the NCC, a physical cell identifier PCI of the second network device and a downlink absolute radio frequency channel number of the second network device.
8. 8. A method of network switching applied to a scenario in which a terminal is switched from a first network device to a second network device, the method comprising: The second network equipment receives a switching request message from the first network equipment, wherein the switching request message comprises a first secret key; the second network device determines a second key according to the first key and the first parameter, wherein the second key is used for communication between the terminal and the second network device.
9. 9. The method of claim 8, wherein the first parameter is a parameter that is not transmitted through the first network device.
10. 10. The method of claim 8 or 9, wherein the first parameter comprises at least one of: A random access preamble identifier; An index value of the timing advance TA; Uplink authorization; A cell radio network temporary identifier C-RNTI; scrambling the identification; terminal position information; Energy state information; a second parameter, the second parameter being determined based on a random access preamble, or the second parameter comprising the random access preamble; a first random number or a second random number, wherein the first random number is determined by the terminal and the second random number is determined by the second network device.
11. 11. The method of claim 10, wherein the method further comprises: the second network device receives a third parameter from the terminal; wherein the third parameter comprises at least one of: the second parameter; The first random number.
12. 12. The method of claim 10, wherein the method further comprises: The second network device sends a fourth parameter to the terminal; wherein the fourth parameter comprises at least one of: the random access preamble identifier; An index value of the TA; The uplink authorization; the C-RNTI; The scrambling identification; the terminal position information; The energy state information; The second random number.
13. 13. The method according to claim 11 or 12, wherein the third parameter is transmitted via a random access message and/or the fourth parameter is transmitted via a random access response message.
14. 14. A method of network switching applied to a scenario in which a terminal is switched from a first network device to a second network device, the method comprising: Before the terminal is switched to the second network equipment, the second network equipment sends a first request message to core network equipment, wherein the first request message is used for requesting key parameters; the second network device receives a first response message from the core network device, wherein the first response message comprises the key parameter; and the second network equipment determines a first key according to the key parameter, wherein the first key is used for communication between the terminal and the second network equipment.
15. 15. The method of claim 14, wherein the second network device determining the first key from the key parameter comprises: And the second network equipment determines the first key according to the key parameter, the physical cell identifier of the second network equipment and the downlink absolute radio frequency channel number of the second network equipment.
16. 16. The method of claim 14 or 15, wherein the key parameter comprises a next hop NH.
17. 17. The method according to any of claims 14-16, wherein before the terminal is handed over to the second network device, comprising before the second network device receives an RRC reconfiguration complete message sent by the terminal.
18. 18. The method of any one of claims 14-17, wherein the method further comprises: The second network device receives a handover request message from the first network device; The second network device sends a switching response message to the first network device, wherein the switching response message corresponds to the switching request message, and the switching response message comprises a first key derivation instruction related or corresponding to the first key.
19. 19. The method of claim 18, wherein the handover request message includes the first key derivation indication or the first response message includes the first key derivation indication.
20. 20. The method of claim 18, wherein a second key derivation indication is included in the handover request message, the first key derivation indication being determined by the second network device based on the second key derivation indication.

Description

Network switching method, terminal and network side equipment Technical Field The application belongs to the technical field of communication, and particularly relates to a network switching method, a terminal and network side equipment. Background In the network handover (e.g., xn handover) scheme provided in the related art, a source network device (e.g., a base station) typically derives a key used after handover for a target network device, that is, the source network device knows the key of the target network device. In this case, since the source network device knows the key used by the target network device, once the source network device is broken, an attacker can obtain the key used by the target network device, which in turn results in exposing the communication content between the target network device and the terminal, and affecting the communication security between the target network device and the terminal. Disclosure of Invention The embodiment of the application provides a network switching method, a terminal and network side equipment, which can improve the communication security between target network equipment and the terminal after switching and avoid exposing the communication content between the target network equipment and the terminal under a network switching scene. In a first aspect, a network switching method is provided and applied to a scenario in which a terminal is switched from a first network device to a second network device, and the method comprises the steps that the terminal receives a first key derivation instruction from the first network device, the terminal determines a first key according to the first key derivation instruction, the terminal determines a second key according to the first key and a first parameter, and the second key is used for communication between the terminal and the second network device. In a second aspect, a network switching method is provided, and the network switching method is applied to a scene that a terminal is switched from a first network device to a second network device, and the method comprises the steps that the second network device receives a switching request message from the first network device, wherein the switching request message comprises a first key, the second network device determines a second key according to the first key and a first parameter, and the second key is used for communication between the terminal and the second network device. In a third aspect, a network switching method is provided, and the network switching method is applied to a scenario that a terminal is switched from a first network device to a second network device, and the method comprises the steps that before the terminal is switched to the second network device, the second network device sends a first request message to a core network device, the first request message is used for requesting a key parameter, the second network device receives a first response message from the core network device, the first response message comprises the key parameter, the second network device determines a first key according to the key parameter, and the first key is used for communication between the terminal and the second network device. In a fourth aspect, a network switching method is provided and applied to a scenario that a terminal is switched from a first network device to a second network device, the method comprises the steps that the first network device sends a switching request message to the second network device, the switching request message comprises a first key derivation indication, the first key derivation indication is determined according to a second key derivation indication currently stored by the first network device, the first network device receives a switching response message from the second network device, the switching response message corresponds to the switching request message, and the switching response message comprises the first key derivation indication. In a fifth aspect, an apparatus for network handover is provided, where the apparatus is applied to a scenario where a terminal is handed over from a first network device to a second network device, where the apparatus includes a transmission module configured to receive a first key derivation indication from the first network device, and a processing module configured to determine a first key according to the first key derivation indication, and determine a second key according to the first key and a first parameter, where the second key is used for communication between the terminal and the second network device. In a sixth aspect, an apparatus for network handover is provided, where the apparatus is applied to a scenario where a terminal is handed over from a first network device to a second network device, where the apparatus includes a transmission module configured to receive a handover request message from the first network device, where the handover request mess