Method and network device for creating and deleting resources

A method comprising:

• during a procedure in which a terminal device is handed over from a non-3rd generation partnership project (non-3GPP) access system to a 3GPP access system, sending, by a mobility management network device to a first anchor, a first message comprising handover indication information, wherein the handover indication information indicates a handover access type of the terminal device other than an initial access to the 3GPP access system;
• sending, by the first anchor to a second anchor, a second message including the handover indication information upon receiving the first message;
• and
• obtaining, by the second anchor according to the handover access type, one or more policy and charging control (PCC) rules applied to a service to be used by the terminal device in the 3GPP access system by using a modification procedure.

A communication system, comprising:

• a mobility management network device, a first anchor and a second anchor;
• wherein:
• the mobility management network device is configured to send a first message to the first anchor during a procedure in which a terminal device is handed over from a non-3rd Generation Partnership Project (non-3GPP) access system to a 3GPP access system, wherein the first message comprises handover indication information indicating a handover access type of the terminal device other than an initial access to the 3GPP access system;
• the first anchor is configured to receive the first message and send a second message including the handover indication information to the second anchor;
• and
• the second anchor is configured to receive the second message and obtain, according to the handover access type by using a modification procedure, one or more policy and charging control (PCC) rules applied to a service to be used by the terminal device in the 3GPP access system.

A system, comprising:

• a serving gateway (Serving GW), and a packet data network gateway (PDN GW);
• wherein the Serving GW is configured to:
• receive a first message comprising handover indication information from a mobility management network device during a procedure in which a terminal device is handed over from a non-3rd generation partnership project (non-3GPP) access system to a 3GPP access system, wherein the handover indication information indicates a handover access type of the terminal device other than an initial access to the 3GPP access system;
• and
• send a second message comprising the handover indication information to the PDN GW;
• wherein the PDN GW is configured to:
• in response to the handover indication information, obtain one or more modified policy and charging control (PCC) rules from a policy and charging rules function (PCRF) by using a modification procedure, wherein the one or more modified PCC rules are applied to a service to be used by the terminal device in the 3GPP access system.