5. The method according to claim 2 , wherein: the packet filter rule context comprises a termination, and a termination property of the termination comprise the filter rule.
2. The method according to claim 1 , wherein the maintaining, by the MG, the packet filter rule context according to the processing message comprises one of: creating a new packet filter rule context according to a message for creating the packet filter rule context sent by the MGC, or modifying a created packet filter rule context according to a message for modifying the packet filter rule context sent by the MGC, or deleting a created packet filter rule context according to a message for deleting the packet filter rule context sent by the MGC; and returning a reply message to the MGC after completion of the creation, modification or deletion.