Rate adjustment method, apparatus, and system

1. A method, comprising:

receiving, by a mobility management network element, a first message from a master network node, wherein the first message comprises first indication information, and the first indication information indicates whether a terminal uses new radio (NR) for access, and wherein the first message further comprises second access point name-aggregate maximum bit rate (APN-AMBR) information, and the second APN-AMBR information is APN-AMBR information indicated by the master network node;

determining, by the mobility management network element based on the first indication information, access information indicating whether the terminal uses NR for accessing the network; and

determining, by the mobility management network element, first APN-AMBR information for the terminal based on the access information and the second APN-AMBR information.

2. The method according to claim 1 , further comprising:

sending, by the mobility management network element, the first APN-AMBR information to the terminal, wherein the first APN-AMBR information is configured to be used to control a data transmission rate.

3. The method according to claim 1 , further comprising:

sending, by the mobility management network element, a first bearer management request to a serving network element, wherein the first bearer management request comprises the access information, and sending the first bearer management request causes the serving network element to send a second bearer management request to a packet data network element, wherein the second bearer management request comprises the access information, the access information is configured to be used to determine third APN-AMBR information, and the third APN-AMBR information is configured to be used by the packet data network element to control a data transmission rate; and

receiving, by the mobility management network element, a first bearer management response from the serving network element, wherein the first bearer management response comprises the third APN-AMBR information.

4. The method according to claim 3 , wherein the first bearer management request further comprises the second APN-AMBR information, the second bearer management request further comprises the second APN-AMBR information, and the second APN-AMBR information and the access information are configured to be used to determine the third APN-AMBR information.

5. The method according to claim 3 , wherein a second bearer management response further comprises fourth indication information, and the first bearer management response further comprises the fourth indication information; and

wherein the method further comprises:

sending, by the mobility management network element, the fourth indication information to the master network node, wherein the fourth indication information indicates whether the master network node allocates a resource of the master network node to a bearer or whether the master network node allocates a resource of a secondary network node to a bearer.

6. The method according to claim 1 , wherein the first indication information is dual connectivity indication information.

7. The method according to claim 1 , wherein the terminal uses NR for access when the terminal uses NR for next generation node B (gNB) access.

8. The method according to claim 1 , wherein the first indication information indicates whether the terminal uses NR for access by indicating a radio access technology type.

9. The method according to claim 1 , wherein the master network node is one of two network nodes to which the terminal is dual-connected.

10. The method according to claim 1 , wherein the first message is a notification message.

11. The method according to claim 1 , wherein the second APN-AMBR information is determined based on actual usage of the master network node.

12. A system, comprising:

a mobility management network element;

a serving network element;

a packet data network element; and

a master network node, wherein the master network node is configured to send a first message to the mobility management network element; and

wherein the mobility management network element is configured to:

receive the first message, wherein the first message comprises first indication information, and the first indication information indicates whether a terminal uses new radio (NR) for accessing a network;

determine, based on the first indication information, access information indicating whether the terminal uses NR for accessing the network; and

determine first access point name-aggregate maximum bit rate (APN-AMBR) information for the terminal based on the access information;

wherein the serving network element is configured to:

receive a first bearer management request from the mobility management network element, wherein the first bearer management request comprises the access information; and

send a second bearer management request to the packet data network element, wherein the second bearer management request comprises the access information;

wherein the packet data network element is configured to:

determine third APN-AMBR information based on the access information; and

send a second bearer management response to the serving network element, wherein the second bearer management response comprises the third APN-AMBR information, and the third APN-AMBR information is configured to be used to control a data transmission rate; and

wherein the serving network element is further configured to send a first bearer management response to the mobility management network element, wherein the first bearer management response comprises the third APN-AMBR information.

13. The system according to claim 12 , wherein the first indication information is dual connectivity indication information.

14. The system according to claim 12 , wherein the mobility management network element is further configured to:

send the first APN-AMBR information to the terminal, wherein the first APN-AMBR information is configured to be used to control a data transmission rate.

15. The system according to claim 12 , wherein the master network node is one of two network nodes to which the terminal is dual-connected.

16. A system, comprising:

a master network node;

a policy management network element;

an access management network element; and

a session management network element;

wherein the access management network element is configured to receive first indication information from the master network node, wherein the first indication information indicates whether a terminal uses new radio (NR) for accessing a network;

wherein the session management network element is configured to:

receive a first message from the access management network element, wherein the first message comprises the first indication information; and

determine first session-aggregate maximum bit rate session (AMBR) information for the terminal based on the first indication information; and

wherein the policy management network element is configured to:

receive a policy update request from the session management network element, wherein the policy update request comprises the first indication information and the first session-AMBR information;

determine third session-AMBR information based on the first indication information and the first session-AMBR information; and

send a policy update response to the session management network element, wherein the policy update response comprises the third session-AMBR information.

17. The system according to claim 16 , wherein the access management network element is further configured to:

receive a location of the terminal from the master network node.

18. The system according to claim 17 , wherein the access management network element is further configured to:

receive, from the master network node, second indication information indicating a dual-connectivity capability of the master network node.

19. The system according to claim 17 , wherein the location of the terminal is a tracking area to which the terminal belongs.

20. The system according to claim 16 , wherein the access management network element is further configured to:

receive, from the terminal, third indication information indicating whether the terminal has a dual-connectivity capability.