Cascading Paging Zones for Wireless Network Latency
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Solution Overview
Problem
Current paging methods in wireless communication networks, such as hierarchical paging, result in significant battery drain and delay when trying to locate a mobile station in dormant mode, as they often require extensive zone coverage and frequent wake-ups, which are costly in terms of resources and battery life.
Innovation Solution
The cascading paging method involves sending paging messages in overlapping zones with specific offsets within the paging interval, allowing the mobile station to quickly determine if it is in the correct zone by responding to messages sent in the first, second, and third zones, thereby minimizing delay and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If hierarchical paging is used to reduce paging zone coverage, then network resource usage is reduced, but paging delay increases significantly when the mobile station is not in the last known zone
Solution Approach 1:
The patent applies preliminary action by having the mobile station perform location updates in advance before entering dormant mode. This ensures the network has current location information stored, allowing immediate paging in the correct zone without hierarchical search delays. The mobile station proactively updates its location while still in active mode, so when it transitions to dormant mode, the network already knows where to page it.
2Speed
If the mobile station wakes up frequently to check for paging messages, then paging responsiveness is improved, but battery life is significantly reduced
Solution Approach 1:
The patent implements periodic action by establishing a structured paging interval where the mobile station wakes up at predetermined periods to check for paging messages. Instead of continuous monitoring or overly frequent wake-ups, the system uses optimized periodic wake-ups at intervals configured to balance responsiveness with battery conservation. The mobile station enters dormant mode between these periodic wake-up points.
3Use of energy by moving object
If the mobile station enters dormant mode to conserve battery power, then energy consumption is reduced, but the network loses track of the mobile station's location
Solution Approach 1:
The patent applies preliminary action by requiring the mobile station to perform location updates before transitioning to dormant mode. This preliminary location update ensures the network has current location information stored in the appropriate serving base station's paging zone database. The mobile station proactively provides its location while still active, so the network can maintain accurate location tracking without requiring continuous communication during dormant mode.
Data Source
AI summary
A method for paging a mobile station where the mobile station (208-212) may be in a dormant state is described. The method begins by sending a first paging message (302) in a first zone (214) of a given area to a selected mobile station wherein the first paging message is sent at the beginning of a paging interval (300). A base station (202-206) then receives a response to the paging message when the mobile station is in the first zone. When the response to the first paging message is not received, a second paging message (306) is sent in a second zone (216) of the given area. The second paging message is sent at a first offset (308) from the sending of the first paging message wherein this first offset occurs less than one paging interval after the sending of the first page message.