Multihoming Resource Reservation for QoS-Aware Handover Paths
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Solution Overview
Problem
Conventional resource reservation protocols in mobile networks are inefficient in utilizing multihoming characteristics, leading to resource wastage and poor quality of service (QoS) due to unnecessary resource reservations and inadequate path management during handovers.
Innovation Solution
A method for resource reservation in IP-based mobile networks that uses multiple care of addresses (CoAs) to query and select communication paths with available resources, prioritizing paths with sufficient bandwidth and dynamically adjusting resource allocation to avoid congestion and optimize QoS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resource reservation protocols (RSVP, E-RSVP, MRSVP) are used in mobile networks, then QoS signaling can be performed, but resources are wasted due to unnecessary resource reservations in adjacent cells and insufficient utilization of multihoming characteristics
Solution Approach 1:
The patent performs resource reservation only when actually needed (during handover or congestion detection) rather than pre-reserving resources in adjacent cells. The mobile node or correspondent node initiates resource reservation queries only along the active communication path, avoiding premature resource allocation in cells where the mobile node may not actually move to.
Solution Approach 2:
The patent divides the resource reservation process into path-specific segments by utilizing multihoming characteristics. Instead of performing end-to-end resource reservation that covers all possible paths, the system segments the reservation to only the active path through multiple network interfaces, allowing independent resource management for each interface and avoiding unnecessary reservations on inactive paths.
2Reliability
If resource reservation is performed for all possible handover paths in multihoming environment, then QoS can be maintained during handover, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements dynamic path selection and resource reservation based on real-time network conditions and mobile node movement. The system continuously monitors the active communication path and dynamically adjusts resource reservation to match the current state, rather than maintaining static reservations for all possible paths. This dynamic approach reduces complexity by adapting to actual handover events rather than pre-configuring all scenarios.
Solution Approach 2:
The patent employs feedback mechanisms where the mobile node or correspondent node receives information about available resources and path conditions, then adjusts resource reservation decisions accordingly. The system uses feedback from resource queries and handover events to intelligently determine when and where to reserve resources, reducing unnecessary complexity while maintaining QoS continuity.
3Productivity
If multiple resource reservations are performed using multiple network interfaces, then resource utilization is improved and load is dispersed, but protocol complexity and signaling overhead increase
Solution Approach 1:
The patent creates a universal resource reservation method that works across multiple network interfaces and protocols (IPv4, IPv6, multihoming). The same basic query and reservation mechanism is applied universally to each interface, allowing the system to leverage multiple paths for improved resource utilization without requiring interface-specific complex protocols. The multihoming characteristics are utilized to disperse load across interfaces while maintaining a unified reservation approach.
4Reliability
If resource reservation messages are transmitted through all available paths, then optimal path selection is enabled, but loss of time due to message propagation increases
Solution Approach 1:
The patent performs preliminary resource queries along multiple paths before finalizing the resource reservation. By proactively gathering resource availability information through query messages sent via multiple network interfaces, the system can quickly determine the optimal path without extensive trial-and-error during actual handover or congestion events. This preliminary information gathering reduces the time needed for final path selection and resource allocation.
Data Source
AI summary
A resource reservation system and method in a multihoming environment are disclosed. The method includes: transmitting query messages from the mobile node to multiple adjacent access routers using a plurality of care of addresses (CoAs) stored in the mobile node; transmitting the query messages from the adjacent access routers to a crossover node; at one or more intermediate nodes on a communication path between the adjacent access routers and the crossover node, recording available resource information in the query messages; receiving the query messages at a predetermined correspondent node; analyzing, at the correspondent node, the recorded available resource information in the received query messages and selecting a communication path which transferred a query message containing available resource information indicating the available resources required by the mobile node; and transmitting a resource reservation message from the correspondent node to the mobile node through the selected communication path.