QoS Path Update in Mobile IPv6 Handovers
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Solution Overview
Problem
In mobile IPv6 networks, handovers can cause interruptions in Quality of Service (QoS) paths due to difficulties in identifying and updating QoS paths during handovers, especially when the new Access Router (nAR) lacks NSIS QoS functionality, leading to potential packet loss or delay.
Innovation Solution
A communication system that allows a communication node to identify and request the assistance of a nearby QoS-capable node (QNE) by sending search packets and response packets, even if the initial node only knows the address of a non-special function node, enabling earlier updating of QoS paths during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RSVP protocol is used to guarantee QoS during handover, then QoS can be maintained, but it is difficult to change QoS path in association with MN movement and double reservation may occur on overlapped portions
Solution Approach 1:
The patent performs QoS path reservation in advance before handover occurs. The mobile node requests QoS path setup to the predicted target subnet before actually moving, so that when handover occurs, the QoS path is already established and ready for immediate use, avoiding interruption and adaptability issues
Solution Approach 2:
The patent introduces a foreign agent as an intermediary that assists in QoS path management during handover. The foreign agent helps establish QoS paths between the mobile node and correspondent nodes in the target subnet, mediating the complex path changes and preventing double reservation problems
2Device complexity
If QoS path is updated after handover, then simplicity is maintained, but communication interruption occurs during handover
Solution Approach 1:
The patent updates QoS path information in advance before handover occurs. The mobile node proactively requests and receives QoS path setup information for the target subnet before actually moving, so that when handover occurs, the path is already established and ready for immediate use, avoiding communication interruption
3Measurement precision
If search packet is transmitted to nAR, then QNE can be identified, but nAR may not have NSIS QoS functionality
Solution Approach 1:
The patent uses the previous access router as an intermediary to forward search packets to potential QNEs in the target subnet. Since the previous access router definitely has NSIS QoS functionality, it can reliably process the search packet and forward it to appropriate nodes, ensuring both identification accuracy and functionality availability
Solution Approach 2:
The patent designs the search packet mechanism to be universally applicable regardless of whether the target node (nAR) has NSIS QoS functionality. The search packet can be forwarded through intermediate nodes that do have the functionality, making the system work in both scenarios where target nodes have or lack NSIS QoS capabilities
Data Source
AI summary
A technique is disclosed, by which it is possible to identify a communication node having special function under the condition that a certain communication node knows only the address of a communication node having no special function. According to this technique, a first communication node 10 having a first function (e.g. the mounting of IPv6 and ICMPv6) and a second function (e.g. the mounting of NSIS) transmits a search packet by an echo request packet of ICMPv6 with the purpose of searching a communication node having the first function and the second function to a second communication node 20 having only the first function. The second communication node sends back a response packet to this by an echo response packet of ICMPv6. A communication node 15 having the first function and the second function and being the first receiver of this response packet grasps that own communication node is the search object of the first communication node. Also, by the search packet, desired information can be offered from the first communication node to the communication node of the search object.