Micro-Tunnels for Mobile IP Service Differentiation
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Solution Overview
Problem
In mobile IP environments, there is a need to identify and manage multiple tunnels efficiently for each mobile node, optimizing resource usage and ensuring differentiated services for various data streams while maintaining in-sequence delivery requirements.
Innovation Solution
The implementation of micro-tunnels as logical connections between the Packet Data Service Node (PDSN) and the Packet Control Function/Base Station Controller (PCF/BSC), identified by source and destination IP addresses, allows for separate communication channels with specific attributes such as 'do not drop' and reordering policies, enabling flexible resource allocation and service differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individual tunnels are established for each data stream to a mobile node, then service differentiation and independent packet treatment are achieved, but device complexity and resource overhead increase
Solution Approach 1:
The patent segments the tunnel identification into two parts: a common tunnel identifier shared by all data streams to a mobile node, and a stream identifier for individual data streams. This segmentation allows service differentiation at the stream level while managing tunnels at the node level, reducing the number of tunnels needed and simplifying tunnel management while maintaining the ability to treat different data streams independently.
2Adaptability or versatility
If multiple individual tunnels are created for each data stream, then independent packet treatment and service differentiation are enabled, but resource usage and system overhead increase
Solution Approach 1:
The patent merges multiple data streams into a single tunnel by using a common tunnel identifier for all streams to a mobile node. Within this single tunnel, different data streams are distinguished using stream identifiers. This merging approach reduces the total number of tunnels required while still enabling independent treatment of each data stream through the stream identifier mechanism.
3Productivity
If traditional IP routing is used without micro-tunnels, then system simplicity is maintained, but flexible resource allocation and optimized resource usage are limited
Solution Approach 1:
The patent applies local quality by assigning specific attributes (such as QoS parameters, packet handling policies, and stream identifiers) to individual data streams within the tunnel. This allows different parts of the data flow to receive different treatments and resource allocations based on their specific requirements, enabling flexible resource allocation without requiring separate tunnels for each stream.
Data Source
AI summary
Micro-tunnels are used to provide multiple data service sessions to the same mobile node in a wireless communications system. Further, the flexibility of the micro-tunnels optimizes the resources of the system. On request for a data service, an encapsulation configuration record is generated. An encapsulation header is created in response to the encapsulation configuration. The encapsulation header includes a packet service identifier and a micro-tunnel identifier.