Mobile Network Resource Reservation via Crossover Router Handover
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Solution Overview
Problem
Conventional resource reservation protocols in mobile networks, such as MRSVP, RSVP-MP, and CORP, face inefficiencies during handovers, leading to double resource reservations, wasted resources, and scalability issues due to their inability to promptly release resources and manage mobility effectively.
Innovation Solution
A method that identifies candidate access and crossover routers using refresh bits to pre-reserve or re-reserve resources, allowing for localized resource management and efficient handover processes by establishing new paths without requiring end-to-end resource re-establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resource reservation protocols (MRSVP, RSVP-MP, CORP) are used during handover, then resource reservation is maintained, but double resource reservations occur and resources are wasted
Solution Approach 1:
The patent applies preliminary action by pre-reserving resources at candidate access routers before handover occurs. The source access router identifies candidate target access routers and pre-establishes resource reservations with them, so that when handover occurs, the mobile node can immediately use the pre-reserved resources without causing double reservations or resource waste.
Solution Approach 2:
The patent segments the resource reservation process into localized segments between the source access router, candidate target access routers, and the crossover router. Instead of end-to-end resource reservation that causes double bookings, the reservation is segmented and managed locally at each access router, allowing efficient resource release and avoiding wastage.
2Reliability
If end-to-end resource re-establishment is performed during handover, then resource continuity is maintained, but handover time increases and QoS deteriorates
Solution Approach 1:
The patent performs preliminary resource reservation at candidate target access routers before handover occurs. This preliminary action ensures resource continuity is already established, eliminating the need for time-consuming end-to-end resource re-establishment during handover, thus reducing handover time while maintaining QoS.
Solution Approach 2:
The patent introduces a crossover router as an intermediary that manages resource reservations between source and target access routers. The crossover router facilitates localized resource management and enables seamless handover without requiring complete end-to-end resource re-establishment, thereby reducing handover time while maintaining resource continuity.
3Adaptability or versatility
If conventional protocols manage mobility during handover, then mobility is supported, but scalability is limited due to double resource reservations
Solution Approach 1:
The patent segments resource reservation management into localized units at each access router rather than centralized end-to-end management. Each access router independently manages its own resource reservations with mobile nodes and candidate target routers, eliminating the scalability limitations of conventional protocols while maintaining full mobility support.
Solution Approach 2:
The patent enables access routers to self-manage resource reservations locally without requiring centralized coordination for end-to-end resource establishment. The source access router autonomously identifies candidates, pre-reserves resources, and the target access router autonomously accepts or releases resources based on handover completion, improving system scalability while supporting mobility.
4Speed
If resources are pre-reserved at all candidate access routers, then handover readiness is improved, but resource availability for other users decreases
Solution Approach 1:
The patent applies partial action by pre-reserving resources only at selected candidate target access routers that are most likely to be the handover destination, rather than at all possible candidate routers. This selective partial reservation accelerates handover while minimizing resource consumption, leaving more resources available for other users.
Solution Approach 2:
The patent dynamically adjusts resource reservation parameters based on mobility patterns, signal strength, and handover probability. By changing reservation parameters selectively for different candidate routers based on their likelihood of being the target, the system achieves fast handover where needed while preserving resource availability for other users in lower-priority scenarios.
Data Source
AI summary
A method, medium, and system for reserving resources in a mobile network. A mobile node reports a start of a handover to a present access router if the handover of the mobile node occurs, and the previous access router transmits specified session information to a candidate access router that has a possibility handling the mobile node's handover. A candidate crossover router, which performs a resource reservation work on a new path and a resource release on the previous path, is searched, and a localized resource reservation is established by exchanging a specified resource reservation message before the handover is completed if the candidate crossover router is determined. Accordingly, duplication of resources can be prevented, and a prompt resource reservation can be achieved during the handover.