OFDM System Acquisition via Pre-stored Parameter Tables
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Solution Overview
Problem
In wireless communication systems, terminals face inefficiencies in system selection and acquisition due to configurable parameters in OFDM and SC-FDM systems, leading to prolonged search times and excessive battery power consumption as they must test various combinations of parameter values.
Innovation Solution
Storing information about system parameters in a Preferred Roaming List (PRL) or Most Recently Used (MRU) list allows terminals to quickly identify and acquire systems by using pre-stored values for FFT size, cyclic prefix length, and guard subcarriers, reducing the need for full searches unless initial acquisition is unsuccessful.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs acquisition for all possible combinations of configurable system parameter values, then the system detection reliability is improved, but the search time and battery power consumption increase excessively
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing acquisition parameters for multiple hypothetical system configurations in a table before the terminal needs to perform system acquisition. When the terminal searches for a system, it can directly query this pre-computed table using detected signal characteristics (like synchronization signal patterns) to quickly identify the correct system parameters without exhaustively testing all possible parameter combinations, thus significantly reducing search time while maintaining detection reliability
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing acquisition parameters for multiple hypothetical system configurations in a table before the terminal needs to perform system acquisition. When the terminal searches for a system, it can directly query this pre-computed table using detected signal characteristics (like synchronization signal patterns) to quickly identify the correct system parameters without exhaustively testing all possible parameter combinations, thus significantly reducing search time while maintaining detection reliability
2Reliability
If the terminal performs acquisition for all possible combinations of configurable system parameter values, then the system detection reliability is improved, but the battery power consumption increases excessively
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing acquisition parameters for multiple hypothetical system configurations in a table before the terminal needs to perform system acquisition. When the terminal searches for a system, it can directly query this pre-computed table using detected signal characteristics (like synchronization signal patterns) to quickly identify the correct system parameters without exhaustively testing all possible parameter combinations, thus significantly reducing search time while maintaining detection reliability
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing acquisition parameters for multiple hypothetical system configurations in a table before the terminal needs to perform system acquisition. When the terminal searches for a system, it can directly query this pre-computed table using detected signal characteristics (like synchronization signal patterns) to quickly identify the correct system parameters without exhaustively testing all possible parameter combinations, thus significantly reducing search time while maintaining detection reliability
3Measurement precision
If the terminal performs full search for all possible values of configurable system parameters, then the acquisition accuracy is improved, but the processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing acquisition parameters for multiple hypothetical system configurations in a table before the terminal needs to perform system acquisition. When the terminal searches for a system, it can directly query this pre-computed table using detected signal characteristics (like synchronization signal patterns) to quickly identify the correct system parameters without exhaustively testing all possible parameter combinations, thus significantly reducing search time while maintaining detection reliability
Data Source
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AI summary
Techniques for performing system selection and acquisition are described. In one design, a terminal may obtain at least one system record for at least one system utilizing orthogonal frequency division multiplexing (OFDM) or single-carrier frequency division multiplexing (SC-FDM). Each system record may include system identification information for an associated system and an index for an associated acquisition record. The terminal may also obtain at least one acquisition record for the at least one system. Each acquisition record may include at least one value for at least one configurable system parameter, e.g., FFT size, cyclic prefix length, number of guard subcarriers, etc. The terminal may perform acquisition for the at least one system in accordance with the at least one system record and the at least one acquisition record. The system and acquisition records may be stored in a Preferred Roaming List (PRL) or a Most Recently Used (MRU) list.