Address Translation for Simple IP in Wireless Devices
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Solution Overview
Problem
The high cost and inefficiency of backhauling communications from roaming wireless communication devices (WCDs) to their home networks, especially when WCDs do not require access to home network services, necessitate a solution to reduce traffic between foreign and home networks.
Innovation Solution
Implementing simple IP with address translation at a PMIP gateway or within the WCD, allowing the PMIP gateway to switch between PMIP mode and simple IP with address translation mode based on network conditions, thereby avoiding unnecessary backhaul by translating home IP addresses to roaming IP addresses, reducing the need for tunneling through the home network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile IP or PMIP tunneling is used to backhaul communications to the home network, then WCDs can access home network services, but the cost and inefficiency of backhauling traffic increases significantly
Solution Approach 1:
The patent changes the operational mode parameter of the PMIP gateway, allowing it to switch between PMIP mode (with tunneling to home network) and simple IP mode (without tunneling). This parameter change enables the system to adapt to different service requirements, using tunneling only when home network services are needed, thereby reducing unnecessary backhaul costs while maintaining service reliability when required
Solution Approach 2:
The patent introduces dynamic mode switching capability in the PMIP gateway, where the gateway can transition between PMIP mode and simple IP mode based on real-time network conditions and service requirements. This dynamic adaptation allows the system to optimize backhaul usage by using tunneling selectively rather than continuously, reducing energy loss and cost while maintaining reliable access to home network services when needed
2Reliability
If PMIP gateway always uses PMIP mode with tunneling, then home network service access is guaranteed, but network efficiency and cost-effectiveness deteriorate
Solution Approach 1:
The patent implements dynamic mode switching in the PMIP gateway, enabling it to transition between PMIP mode (with tunneling) and simple IP mode (without tunneling) based on current network conditions and service requirements. This dynamic behavior allows the system to maintain high network efficiency by using simple IP mode when home network services are not needed, while ensuring reliable service access by switching to PMIP mode when required
Solution Approach 2:
The patent changes the operational mode parameter of the PMIP gateway from a static configuration to a dynamic one that can be adjusted based on service requirements. By changing this parameter, the system can optimize network efficiency by minimizing tunneling usage while maintaining the capability to provide reliable home network service access when the parameter is set to PMIP mode
3Loss of energy
If address translation is implemented at the PMIP gateway, then backhaul traffic is reduced, but device complexity increases
Solution Approach 1:
The patent merges the address translation function with the existing PMIP gateway functionality. Instead of implementing address translation as a separate, standalone system, the patent integrates it into the PMIP gateway that already manages WCD communications. This merging approach reduces backhaul traffic by translating home IP addresses to local IP addresses at the gateway, while avoiding the complexity of adding a completely new system by leveraging the existing gateway infrastructure
Data Source
AI summary
Methods and devices for supporting simple Internet Protocol (IP) with address translation in a wireless communication device (WCD) are presented. The WCD may contain a translation module and an application module. The application module may be assigned a local IP address to which the application module binds. However, the translation module may attempt to hide the application module's use of this local address. Thus, the translation module may translate the source address of packets sent by the application module from the local IP address to a different IP address that has been assigned to the WCD by a Proxy Mobile IP (PMIP) gateway.