IPv6 Address Release Notification for Local Link Resource Recovery
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Solution Overview
Problem
In IPv6 broadband access networks, address release mechanisms lead to resource wastage and incorrect charging due to the lack of efficient communication about address availability within the local link, especially in scenarios involving prefix sharing.
Innovation Solution
A method where a user node notifies other nodes within the local link of a released IPv6 address using a Neighbor Advertise (NA) message, indicating the address status through an extended CODE field, allowing the Broadband Remote Access Server (BRAS) to stop charging and other nodes to reuse the address.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the BRAS router equipment allocates the same prefix to multiple users, then address resource utilization is improved, but duplicate address detection conflicts occur and charging accuracy deteriorates
Solution Approach 1:
The patent segments the address management process by introducing separate notification mechanisms for different address states. When a user releases an address, the system segments the notification process into: (1) local link notification via NA message to enable address reuse, and (2) BRAS notification to enable accurate charging cessation. This segmentation resolves the contradiction by allowing prefix sharing while maintaining charging accuracy through dedicated notification paths.
Solution Approach 2:
The patent implements feedback mechanisms where users provide status information about their address usage to both the local link and BRAS. The feedback loop includes: (1) users sending NA messages when releasing addresses to notify local nodes, and (2) users notifying BRAS to stop charging. This feedback system resolves the contradiction by ensuring that address resource sharing does not compromise charging accuracy, as the BRAS receives direct feedback about address release status.
2Quantity of substance
If a user releases an IPv6 address, then address resource availability is improved, but other nodes cannot detect the release and resource wastage occurs
Solution Approach 1:
The patent makes the NA message multi-functional by extending its capabilities beyond traditional neighbor advertisement. The NA message now serves dual purposes: (1) traditional neighbor status advertisement, and (2) address release notification to local link nodes. This universality resolves the contradiction by enabling address release information propagation using existing protocol infrastructure, thereby improving resource availability without requiring new message types.
Solution Approach 2:
The patent introduces the NA message as an intermediary carrier for address release information. Instead of requiring direct communication between releasing users and all potential address users, the NA message acts as an intermediary that broadcasts release information to all nodes on the local link. This intermediary mechanism resolves the contradiction by efficiently propagating address release information to enable resource reuse while maintaining simple user-side implementation.
3Device complexity
If the BRAS continues charging after address release, then charging system simplicity is maintained, but charging accuracy deteriorates and users incur incorrect expenses
Solution Approach 1:
The patent implements a feedback mechanism where users notify the BRAS when they release addresses. This feedback loop allows the BRAS to maintain charging accuracy by receiving direct notifications about address release status. The feedback approach resolves the contradiction by adding minimal complexity (a notification channel) to achieve precise charging control, avoiding both over-charging and the need for complex monitoring systems.
Solution Approach 2:
The patent enables users to self-notify the BRAS about their address release status. Instead of requiring the BRAS to actively monitor and detect address releases (which would increase complexity), users autonomously provide the necessary information to the BRAS. This self-service approach resolves the contradiction by maintaining BRAS simplicity while achieving charging accuracy through user-initiated notifications.
4Reliability
If users perform DAD detection multiple times, then address conflict detection reliability is improved, but time consumption increases and address reuse is delayed
Solution Approach 1:
The patent implements preliminary action by notifying local link nodes of address release before new users perform DAD detection. When a user releases an address, the system proactively notifies all local nodes via NA message, marking the address as available. This preliminary notification resolves the contradiction by eliminating the need for multiple DAD detection attempts, as new users can directly use released addresses without time-consuming conflict detection, thereby reducing address reuse time while maintaining reliability through advance notification.
Data Source
AI summary
A method for releasing an address, a user node and a remote access server are disclosed. The method includes: when releasing an Internet protocol version 6 (IPv6) address, a user node notifying the released IPv6 address to nodes within a scope of a local link. In the above technical scheme, when releasing the IPv6 address generated through a prefix, the user node notifies the released IPv6 address to the nodes within the scope of the local link, which enhances the accuracy of charging, improves the user experience, and plays a role of address resource recovery within the scope of the local link, thereby being able to reuse address resources released by the user in the network.