Paging Controller Centralizes Wireless Paging Retransmission
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Solution Overview
Problem
The existing paging mechanism in wireless access systems, such as WIMAX, often results in unnecessary broadcast of paging messages after a mobile station responds, leading to resource wastage and increased interference due to unreliable delivery of stop signals, causing multiple BSs to continue broadcasting despite the message being received.
Innovation Solution
Centralizing the management of paging message retransmissions at the Paging Controller level, where Base Stations only broadcast the message upon request from the Paging Controller, and introducing a new Information Element in the Paging Announce message to specify the number of attempts for paging, allowing the system to automatically stop broadcasting once a response is received, thus reducing redundant transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paging message retransmission is managed at Base Station level with paging start/stop mechanism, then paging reliability is improved, but radio resource waste and interference increase due to unnecessary broadcasts after MS responds
Solution Approach 1:
The patent introduces a Paging Controller as an intermediary entity that centralizes the management of paging message retransmissions. The Paging Controller coordinates all Base Stations in the paging area, ensuring that when one BS receives a response from the MS, it notifies the Paging Controller, which then instructs all other BSs to stop broadcasting. This mediator role eliminates the need for individual BSs to continue broadcasting unnecessarily, thus reducing radio resource waste while maintaining reliable paging delivery.
Solution Approach 2:
The patent implements a feedback mechanism where Base Stations report paging response status to the Paging Controller. When a BS receives a paging response from an MS, it sends feedback to the Paging Controller, which then uses this information to stop retransmission commands to all BSs. This feedback loop ensures that paging transmissions are dynamically adjusted based on actual MS response status, preventing unnecessary broadcasts and reducing interference.
2Loss of energy
If paging stop signal is broadcast to all Base Stations, then redundant paging transmissions are reduced, but reliable delivery of stop signal to all recipients cannot be guaranteed
Solution Approach 1:
The Paging Controller serves as a centralized intermediary that receives stop conditions from any BS and propagates stop commands to all other BSs. This centralized coordination ensures that the stop signal is reliably delivered to all recipients through the Paging Controller's authority over the paging area, eliminating the uncertainty of direct BS-to-BS signaling.
Solution Approach 2:
The patent merges the paging control functions of multiple Base Stations into a single Paging Controller. Instead of each BS independently managing its paging transmissions, all paging control decisions are centralized. This merging ensures that stop signals are coordinated system-wide, with the Paging Controller guaranteeing that all BSs receive and execute stop commands reliably.
3Adaptability or versatility
If multiple paging messages (start and stop) are sent to manage paging, then paging control flexibility is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The Paging Controller performs multiple functions: it initiates paging transmissions, monitors response status, coordinates stop commands, and manages retransmission logic for all Base Stations. This universal paging control entity eliminates the need for separate paging start/stop signaling between individual BSs, simplifying the overall protocol while maintaining flexible paging control across the entire paging area.
Data Source
AI summary
An object of the present invention is a method for improving paging performances in a wireless access system, said method comprising the steps of: —retransmitting a paging message in case of no response from a paged Mobile Station, —performing said retransmission at a Base Station level, —managing said retransmission at a Paging Controller level.