Cyclic Prefix Detection via Symbol Index Offset
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently obtaining cyclic prefix (CP) information using synchronization signals, particularly in next-generation mobile communication systems that require advanced data transfer rates, low latency, and high energy efficiency, due to the complexity of CP types and beamforming configurations.
Innovation Solution
A method is developed where a terminal detects specific synchronization signals in both original and permuted subframes, using offset values between symbol indices to determine CP types, and combines this with symbol length information to accurately obtain CP information, even in frequency division multiplexing schemes, thereby correcting errors in CP acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization signals are transmitted using analog beamforming with multiple beams, then coverage and signal reliability are improved, but the complexity of determining CP information increases due to multiple beam configurations
Solution Approach 1:
The patent divides the beamforming configuration into two distinct segments: original subframes with normal symbol indexing and permuted subframes with reordered symbol indexing. This segmentation allows the system to transmit synchronization signals across multiple beams while encoding CP information through the structural difference between these two segments, thereby maintaining signal reliability through diverse beam coverage while managing complexity through organized structure
Solution Approach 2:
The patent changes the parameter of symbol index ordering between original and permuted subframes. By permuting the order of symbols in specific subframes while maintaining normal ordering in others, the system encodes CP length information (normal CP vs. extended CP) without requiring additional signaling overhead, thus improving reliability through robust beamforming while controlling complexity through parameter variation
2Adaptability or versatility
If multiple CP types are supported in the wireless communication system, then adaptability to different service requirements is improved, but the difficulty of detecting and measuring CP information increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring permuted subframes with specific symbol reordering patterns that correspond to different CP types. The UE is provided with reference information about the permutation patterns in advance, allowing it to预先 know how to interpret the symbol indices. This enables the UE to easily detect CP information by simply identifying which permutation pattern is used, thereby supporting multiple CP types while reducing detection difficulty
Solution Approach 2:
The patent introduces permuted subframes as an intermediary mechanism between the physical layer beamforming configuration and the logical CP type indication. The permutation pattern acts as a mediator that translates physical signal characteristics into interpretable CP type information, allowing the UE to determine CP length without directly measuring complex physical parameters, thus improving adaptability while simplifying detection
3Measurement precision
If CP information is obtained using traditional methods with multiple reference signals, then measurement accuracy is improved, but the loss of time for signal processing increases
Solution Approach 1:
The patent extracts CP type information directly from the structural characteristics of synchronization signal subframes (original vs. permuted) without requiring separate reference signals or additional measurement procedures. By taking out the CP indication function from the traditional multi-signal reference approach and embedding it within the synchronization signal structure itself, the system achieves accurate CP detection using the same signals already being processed for synchronization, thereby maintaining precision while reducing time loss
Solution Approach 2:
The patent makes the synchronization signal subframes multi-functional by having them serve both synchronization purposes and CP type indication purposes simultaneously. The same original and permuted subframes that enable time and frequency synchronization also encode CP length information through their structural differences. This universality eliminates the need for separate reference signals, achieving accurate CP measurement while reducing signal processing time
Data Source
AI summary
The present invention discloses a method for obtaining information for a cyclic prefix (CP) in a wireless communication system by a terminal and a device for the same. Specifically, a method for obtaining information for a cyclic prefix (CP) in a wireless communication system by a terminal includes: detecting a specific synchronization signal received from a base station via a first symbol of a first subframe; detecting the specific synchronization signal received from the base station via a second symbol of a second subframe; and obtaining information for the CP applied to transmission of the specific synchronization signal based on an offset value between an index of the first symbol and an index of the second symbol.