Femtocell Pilot Beacon Emission Adaptation
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Solution Overview
Problem
Femtocells face interference issues with pilot beacons on certain air interface protocols, such as EV-DO, which cause more interference with macro networks compared to others, like 1×RTT, necessitating a method to limit interference while maintaining service capability for mobile stations operating on these protocols.
Innovation Solution
A femtocell system emits pilot beacons on a given air interface protocol only after detecting a capable mobile station, specifically starting with a less interfering protocol like 1×RTT and then switching to EV-DO upon registration request, thereby reducing unnecessary pilot beacon transmission and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pilot beacons are transmitted on EV-DO protocol, then service capability for mobile stations is maintained, but interference with macro networks increases
Solution Approach 1:
The system dynamically adjusts the air interface protocol used for pilot beacon transmission based on real-time detection of mobile station capabilities. Instead of using a fixed protocol, the femtocell switches between 1xRTT and EV-DO protocols adaptively, selecting the protocol that minimizes interference while maintaining service capability. This dynamic adaptation resolves the contradiction by making the harmful factor (interference) variable rather than constant.
Solution Approach 2:
The invention changes the parameter of air interface protocol from a static configuration to a dynamic one that can switch between different protocol types (1xRTT and EV-DO). By changing this fundamental parameter based on mobile station detection, the system optimizes the balance between service capability and interference generation, allowing EV-DO to be used only when necessary and 1xRTT to be used when it causes less interference.
2Reliability
If pilot beacons are transmitted continuously on all protocols, then service availability is maximized, but unnecessary interference is generated
Solution Approach 1:
Instead of transmitting pilot beacons continuously on all supported protocols (excessive action), the system transmits pilot beacons only on the protocol that is currently determined to cause less interference (partial action). The femtocell selectively activates pilot beacon transmission on 1xRTT or EV-DO based on mobile station capability detection, avoiding unnecessary transmissions on protocols that would generate excessive interference or are not currently needed.
Solution Approach 2:
The system employs periodic detection of mobile station capabilities and switches the pilot beacon transmission protocol accordingly. Rather than maintaining continuous transmission on all protocols, the femtocell periodically assesses the situation and adjusts its transmission behavior, creating a rhythmic pattern of detection and adaptive transmission that reduces unnecessary energy consumption while maintaining service availability.
Data Source
AI summary
Disclosed herein is a method for emitting pilot beacons. The method includes a base station system emitting a pilot beacon on a first air interface protocol. The base station system wirelessly receives a registration message for a mobile station that detected the pilot beacon on the first air interface protocol. The registration message includes a registration request seeking registration of the mobile station under the first air interface protocol with the base station system. In response to the received registration message, the base station system makes a determination that the mobile station is capable of operating on a second air interface protocol different from the first air interface protocol. In response to the determination, the base station system emits at least one pilot beacon on the second air interface protocol.