Frequency Assignment Sequences for Timing Estimation in Carrier Aggregation
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Solution Overview
Problem
In communication systems, particularly in carrier aggregation (CA) transmission mode, existing techniques face challenges in improving timing estimation accuracy due to hardware impairments and interference between base stations, which affect time resolution and timing accuracy.
Innovation Solution
A method involving the generation and transmission of frequency assignment sequences, where elements are mapped to specific subcarrier groups with null values and guard bands to minimize interference, and using comb-type mapping schemes to optimize subcarrier usage, thereby enhancing timing estimation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation transmission mode is used to secure wide bandwidth, then network coverage and transmission rate are improved, but timing estimation accuracy deteriorates due to hardware impairments and interference between base stations
Solution Approach 1:
The patent segments the frequency assignment sequences into different groups (first FA sequence, second FA sequence, third FA sequence, fourth FA sequence) corresponding to different base stations and symbols. Each sequence is independently designed and mapped to specific subcarrier groups, allowing separate optimization and interference management for each segment, thereby improving timing estimation accuracy in CA mode
Solution Approach 2:
The patent applies different sequence designs and mapping strategies to different local regions (subcarrier groups, symbols, base stations). Specifically, null values are mapped to specific subcarrier groups to avoid interference, and different sequence generation methods are applied based on local conditions (first sequence for first FA, second sequence for second FA), optimizing timing estimation performance locally while maintaining overall system productivity
2Measurement precision
If frequency assignment sequences are mapped to subcarrier groups with null values and guard bands, then interference is reduced and timing estimation performance is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-determining the sequence designs, null value positions, and mapping strategies before actual signal transmission. The frequency assignment sequences are generated in advance with predetermined patterns, and the mapping to subcarrier groups is pre-planned to avoid interference, reducing the complexity of real-time signal processing while maintaining high timing estimation performance
Data Source
AI summary
A method may comprise: generating first and second FA sequences corresponding to first and second FAs, respectively, based on a first sequence; mapping elements of first and second FA signals, which are respectively generated by modulating the first and second FA sequences, to first and second subcarrier groups corresponding to the first and second FAs, first base station, and first symbol; generating third and fourth FA sequences corresponding to the first and second FAs, respectively, based on a second sequence; mapping elements of third and fourth FA signals, which are respectively generated by modulating the first and second FA sequences, to third and fourth subcarrier groups corresponding to the first and second FAs, second base station, and second symbol; and transmitting a first transmission signal including the first and second FA signals, and a second transmission signal including the third and fourth FA signals.