Proxy Mobile Client Relocating Foreign Agent for Idle Mode Paging Latency
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Solution Overview
Problem
Wireless access networks face challenges in quickly locating mobile terminals in idle mode, leading to excessive delay for time-sensitive applications like VoIP and PTT, as the location of idle mode mobile stations is not continually updated, and they lack efficient methods for handover and paging.
Innovation Solution
The implementation of a proxy mobile client that performs network operations on behalf of the mobile station, such as MIP registration requests and responses, and a handover procedure involving anchor and relay paging controllers to maintain and update the mobile station's location, enabling quicker paging and data path establishment without the mobile station's knowledge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the mobile station is in idle mode without continuous location updates, then network resources are saved and power consumption is reduced, but the delay for locating the mobile terminal increases excessively
Solution Approach 1:
The network performs preliminary location updates and maintains location information for idle mode mobile stations through the proxy mobile client and paging controller. The system proactively updates the foreign agent's location information even when the mobile station is in idle mode, so that when paging is needed, the location is already known and no excessive delay occurs.
Solution Approach 2:
The patent introduces a proxy mobile client and paging controller as intermediary entities that manage location information on behalf of idle mode mobile stations. These intermediaries maintain the foreign agent's location information and handle paging operations, allowing the mobile station to save power while the network maintains accurate location data through the intermediary components.
2Loss of information
If the mobile station performs continuous location updates in idle mode, then the current location is always known, but network resources are consumed and the data path becomes longer
Solution Approach 1:
The proxy mobile client acts as an intermediary that maintains location information for idle mode mobile stations. Instead of requiring continuous updates from the mobile station itself, the intermediary periodically maintains the foreign agent's location information, reducing the burden on network resources while ensuring location accuracy is maintained when needed.
Solution Approach 2:
The system enables self-service location management where the proxy mobile client and paging controller automatically maintain location information without requiring active participation from the mobile station. The intermediary components handle location updates and paging operations autonomously, reducing overall network resource consumption.
3Reliability
If a handover procedure is implemented for idle mode mobile stations, then location updates are maintained, but the device complexity and operational complexity increase
Solution Approach 1:
The paging controller serves as an intermediary that simplifies the handover procedure for idle mode mobile stations. Instead of requiring complex interactions between the mobile station and multiple network entities, the paging controller centralizes the handover management, maintaining location information and coordinating the handover process, thereby reducing operational complexity while ensuring reliable handover capability.
4Productivity
If the mobile station is paged immediately upon location change, then time-sensitive applications are supported, but the paging latency increases due to lack of location update
Solution Approach 1:
The system performs preliminary location maintenance through the proxy mobile client, keeping the foreign agent's location information updated even when the mobile station is in idle mode. This preliminary action ensures that when paging is initiated, the location information is already current, enabling immediate paging without latency while still allowing the mobile station to remain in power-saving idle mode.
Data Source
AI summary
Embodiments of a wireless access network and methods for relocating a foreign agent (FA) for an idle mode mobile station (MS) in a proxy mobile internet protocol (PMIP) enabled access service network (ASN) are described herein. In some embodiments, the relocation of the FA is triggered by either an anchor paging controller or a paging controller of a target ASN when the idle mode mobile stations moves across ASNs.