Mobile IPv6 Handover Path Setting for QoS Continuity
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Solution Overview
Problem
Existing mobile IPv6 handover techniques, such as RSVP, face challenges in maintaining continuous Quality of Service (QoS) guarantees during handovers, particularly due to difficulties in changing QoS paths and potential double resource reservations, which disrupt seamless communication.
Innovation Solution
A new path setting method that identifies a crossover node by transmitting a message with path information from the mobile terminal to a second access router, allowing for quick and continuous QoS service reception after handover by establishing a new path while releasing and updating resource reservations efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RSVP protocol is used for QoS path management during handover, then QoS guarantees can be maintained, but path changing difficulty and double resource reservation problems occur
Solution Approach 1:
The patent applies preliminary action by having the mobile terminal transmit path information to the target access router before handover occurs. This allows the target access router to pre-prepare the QoS path, so when handover happens, the path switching is immediate and seamless, avoiding the complexity of real-time path recalculation and preventing double resource reservation.
2Reliability
If QoS path is changed during handover, then mobile terminal can maintain service quality, but double resource reservation and path state update issues arise
Solution Approach 1:
The patent implements preliminary action by transmitting path information before handover, enabling the target access router to pre-establish QoS path parameters. This eliminates the need for time-consuming path updates after handover, as the path is already prepared and can be activated immediately.
3Speed
If message transmission with path information is performed before handover, then crossover node can be identified quickly, but additional signaling overhead is introduced
Solution Approach 1:
The patent applies the extraction principle by isolating only the essential path information needed for QoS path identification and transmitting it in a dedicated message format. This minimal extraction of necessary information enables fast handover without the overhead of complete path state transmission, balancing speed and signaling complexity.
Data Source
AI summary
A technique is disclosed, by which a mobile terminal (mobile node) performing handover can quickly and continuously receive after the handover the additional services as it has been receiving before the handover. According to this technique, MN (mobile node; mobile terminal) 10 transmits a message including a session identifier or the like of a path 24 to QNE (proxy) 68 under the condition connected to AR (access router) 21 before the handover. QNE 62 and QNE 63 on a path 34 where this message is transferred are present on the path 24, and its own interface address is added to the message. On the other hand, QNE 67 is not present on the path 24 and transfers the message as it is. As a result, QNE (proxy) 68 determines QNE 63 as a crossover node and turns the path upstream from QNE 63 to an identical path, while a path 35 as changed from a downstream path can be set as a path to be used by MN after the handover.