Access Management Method, Device and System

An access management method, comprising:

• receiving a mapping table entry update message sent by an ASR, wherein, the mapping table entry update message indicates to set an RID in a mapping table entry corresponding to an MN to be NULL, which represents that the MN does not access the ASR currently;
• updating the locally stored RID in the mapping table entry corresponding to the MN to be NULL;
• and
• when an RID corresponding to a destination AID of a locally received message is NULL, discarding the message.

An access management method, comprising:

• an ILR receiving a mapping table entry update message sent by an ASR, wherein, the mapping table entry update message indicates to set an RID in a mapping table entry corresponding to an MN to be NULL, which represents that the MN does not access the ASR currently;
• updating the locally stored RID in the mapping table entry corresponding to the MN to be NULL;
• and
• when a message for requesting the mapping table entry corresponding to the MN is received, sending a response message, and carrying the mapping table entry corresponding to the MN in the response message, wherein, the RID recorded in the mapping table entry is NULL.

An access management system, comprising:

• a first access management device, a second access management device and a third access management device;
• the first access management device is configured to:
• when detecting that an MN accessing the first access management device is offline, query a local AID and RID mapping table, determine a correspondent node of the offline MN, send a mapping table entry update message to the second access management device and the third access management device, and set an RID in a mapping table entry corresponding to the MN to be NULL, which represents that the MN does not access an ASR currently;
• and
• the second access management device is configured to:
• receive the mapping table entry update message sent by the first access management device, update the locally stored RID in the mapping table entry corresponding to the MN to be NULL, and when an RID corresponding to a destination AID of a locally received message is NULL, discard the message;
• and
• the third access management device is configured to:
• receive the mapping table entry update message sent by the first access management device, update the locally stored RID in the mapping table entry corresponding to the MN to be NULL, and when a message for requesting the mapping table entry corresponding to the MN is received, send a response message, and carry the mapping table entry corresponding to the MN in the response message, wherein, the RID recorded in the mapping table entry is NULL.