Fast Paging in IP Wireless Systems via Subnet-Aware Location Updates
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Solution Overview
Problem
In IP-based wireless mobile communication systems, mobile stations in idle mode face delays and increased signaling load when moving between IP subnets, as current methods lack efficient mechanisms for updating IP addresses during paging, leading to prolonged call setup times and resource consumption.
Innovation Solution
A method where a mobile station requests a location update and receives a temporary IP address from the serving base station, with the paging controller determining subnet changes and notifying the station, allowing for reduced signaling load and faster bidirectional communication by broadcasting MOB_PAG-ADV messages per individual IP subnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If mobile stations operate in idle mode to minimize power consumption, then power consumption is reduced, but location update delays increase when moving between IP subnets
Solution Approach 1:
The system performs preliminary location update checks by broadcasting MOB_PAG-ADV messages containing subnet information before actual data transmission. When an MS in idle mode receives this message, it can proactively determine if a subnet change has occurred and initiate location update procedures in advance, rather than waiting for delay-critical events to occur.
Solution Approach 2:
The MOB_PAG-ADV message provides feedback information about IP subnet changes to idle mode MSs. This feedback mechanism allows MSs to monitor their location status and trigger location updates only when necessary (when subnet changes are detected), balancing power savings with timely location updates.
2Device complexity
If conventional paging methods are used without IP subnet awareness, then system complexity is reduced, but signaling load increases during location updates
Solution Approach 1:
The patent applies local quality by making the paging system subnet-aware. The MOB_PAG-ADV message includes specific IP subnet information tailored to each MS's location, allowing the system to provide differentiated paging services based on the MS's IP subnet status. This enables targeted location updates only when subnet changes occur, reducing unnecessary signaling.
Solution Approach 2:
The paging system is segmented into multiple paging groups, each associated with specific IP subnets. The MOB_PAG-ADV message contains subnet-specific information that allows MSs to determine whether their current paging group still corresponds to their IP subnet. This segmentation enables efficient filtering and reduces signaling load by avoiding blanket paging across all groups.
3Measurement precision
If location updates are performed frequently to ensure accurate positioning, then positioning accuracy is improved, but call setup time increases
Solution Approach 1:
The MS autonomously determines whether a location update is needed by checking the subnet information in MOB_PAG-ADV messages against its current IP subnet. This self-service mechanism allows the MS to make intelligent decisions about when to update its location, ensuring accuracy is maintained only when necessary (upon subnet changes) rather than through frequent unnecessary updates.
Solution Approach 2:
The system changes the parameter being monitored from general location (cell ID) to specific IP subnet information. By tracking subnet changes rather than all location changes, the system maintains positioning accuracy at the network routing level while reducing the frequency of location update procedures, thereby decreasing call setup time.
Data Source
AI summary
A system is provided for performing location update in a wireless mobile communication system that uses an Internet protocol (IP) address and is classified as at least one paging group. A serving base station (BS) sends a message including an identifier of a paging group where the serving BS is located, determines whether there is a change in IP subnet of a mobile station (MS) upon receipt of a location update request from the MS, and upon recognizing a change in IP subnet of the MS, stores information on a new IP subnet and notifies the change in the IP subnet to the MS. Upon detecting a need for location update, the MS sends a request for location update to a serving BS, and receives a location update success notification and an allocated temporary IP address from the serving BS.