Portable Base Station Code Space Assignment
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Solution Overview
Problem
In cellular communication systems, the manual assignment of pseudorandom number (PN) offsets to fixed and portable base stations is time-consuming and expensive, leading to potential interference between closely located stations, which complicates identification by access terminals.
Innovation Solution
A system where a portable base station dynamically requests a portion of a code space from a remotely located control station based on its location, using pseudorandom number sequences with offsets to uniquely identify itself, allowing for efficient and cost-effective deployment and minimizing signal collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual assignment of PN offsets is used, then unique identification of base stations is achieved, but the deployment process becomes time-consuming and expensive
Solution Approach 1:
The portable base station automatically requests and receives PN offset assignment from the control station without requiring manual intervention. The system self-configures by transmitting a request message that includes its current location, receives the assigned offset, and begins operations immediately, eliminating the time-consuming manual RF planning process while ensuring unique identification through centralized assignment
Solution Approach 2:
The control station pre-calculates and assigns appropriate PN offsets based on the portable base station's location before the station becomes operational. By performing the assignment in advance during the initialization phase rather than during manual configuration, the system eliminates deployment delays while ensuring that unique identification parameters are ready before transmission begins
2Object-affected harmful factors
If manual RF planning is performed, then signal interference between base stations is reduced, but the process becomes complex and costly
Solution Approach 1:
The control station serves as an intermediary that centralizes the complex RF planning function. Instead of requiring manual RF planning expertise at each deployment location, the control station automatically calculates appropriate PN offsets based on location data and transmits them to portable base stations, thereby reducing signal interference while eliminating the need for complex manual planning processes
Solution Approach 2:
The manual mechanical process of RF planning (involving spreadsheets, calculators, and expert judgment) is replaced by an automated electronic system. The control station uses computational algorithms to automatically determine optimal PN offsets based on location information, substituting manual mechanical planning with automated electronic calculation that reduces both complexity and the potential for human error
3Productivity
If dynamic code space assignment is implemented, then deployment efficiency is improved, but system controllability becomes more challenging
Solution Approach 1:
The portable base station provides feedback to the control station by including its current location in the request message. This feedback mechanism allows the control station to make informed dynamic assignments based on real-time location data while maintaining centralized control. The system balances deployment efficiency with controllability because the automated process responds to actual conditions (location feedback) rather than using static pre-assigned codes
Data Source
AI summary
In addition to other aspects disclosed, a portable base station requests assignment of a portion of a code space from a remotely located control station. The assignment is based upon the location of the portable base station. The portable base station is also capable of transmitting an identification signal using the assigned code space portion to uniquely identify the portable base station to one or more access terminals.