LCIB Handoff Selection via PN Offset and RNR Feedback
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Solution Overview
Problem
Active-mode handoffs from macro networks to Low-Cost Internet Base Stations (LCIBs) are often problematic due to the difficulty in selecting the correct LCIB for handoff, especially when multiple LCIBs are in close proximity, and the challenge of distinguishing between authorized and restricted LCIBs.
Innovation Solution
A method is implemented where a mobile station's request to add a pseudorandom number (PN) offset associated with an LCIB pilot beacon is initially denied, and a candidate set of LCIBs is identified within the macro-network sectors. The method determines if the mobile station is authorized to one LCIB, trims the set by removing restricted and mismatched LCIBs, and directs the handoff to the LCIB that reports the greatest reverse noise rise (RNR) if recent registration is confirmed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple LCIBs are deployed in close proximity to extend coverage, then network coverage and service availability are improved, but the difficulty of selecting the correct LCIB for handoff increases
Solution Approach 1:
The system performs preliminary actions by having mobile stations register with LCIBs in advance and store registration information. When handoff is needed, the macro network entity can quickly identify candidate LCIBs based on pre-collected registration data, eliminating the need for complex real-time selection among multiple nearby LCIBs.
Solution Approach 2:
The system implements feedback mechanisms where LCIBs report reverse noise rise (RNR) measurements to the macro network entity. This feedback allows the network to identify which LCIB is experiencing the strongest signal from the mobile station, enabling intelligent handoff decisions based on actual signal conditions rather than just geographic proximity.
2Reliability
If LCIBs operate in restricted mode with authorization requirements, then security and service quality are improved, but the complexity of distinguishing authorized vs. restricted LCIBs increases
Solution Approach 1:
Authorization information is collected in advance during the registration phase. Mobile stations provide their authorization status when registering with LCIBs, and the macro network entity stores this information. During handoff, the system can immediately filter candidate LCIBs based on pre-verified authorization status without requiring complex real-time authentication procedures.
3Measurement precision
If the system implements comprehensive LCIB identification and selection procedures, then handoff accuracy is improved, but the handoff decision time and processing overhead increase
Solution Approach 1:
The handoff process is segmented into distinct phases: identifying candidate LCIBs based on PN offsets, filtering candidates using pre-collected authorization information, and selecting the final target using RNR feedback. This segmentation allows each step to be performed efficiently with minimal processing time while maintaining high selection accuracy.
Solution Approach 2:
The system performs preliminary filtering of candidate LCIBs using pre-collected registration and authorization data before initiating the actual handoff decision. This preliminary action reduces the number of LCIBs that need to be evaluated in real-time, significantly reducing handoff decision time while maintaining accuracy.
Data Source
AI summary
Methods and systems are provided for selecting a low-cost Internet base station (LCIB) for a macro-network-to-LCIB handoff of an active mobile station. In one embodiment, a handoff request is received from a mobile station, the handoff request indicating that the mobile station is requesting that a first pseudorandom number (PN) offset be added to an active set for the mobile station, the active set comprising one or more macro-network sectors. It is determined that the first PN offset is associated with an LCIB pilot beacon, and a candidate set of LCIBs is responsively identified, the candidate set consisting of substantially all of the LCIBs that are located in the one or more macro-network sectors in the active set. It is determined whether the mobile station is an authorized mobile station of exactly one LCIB in the candidate set and, if so, the mobile station is directed to handoff to that LCIB.