Narrowband Synchronization Signal Configuration for NB-IoT Frame Detection
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving synchronization signals, particularly in NarrowBand-Internet of Things (NB-IoT) systems, where existing methods struggle to accurately determine the radio frame structure and suffer from high error rates and increased complexity.
Innovation Solution
The proposed method configures the Narrowband Primary Synchronization Signal (NPSS), Narrowband Secondary Synchronization Signal (NSSS), and Narrowband Broadcast Channel (NPBCH) transmission periods and locations differently based on the radio frame structure type, using Zadoff-Chu sequences and modified resource mapping schemes to distinguish between Frequency Division Duplex (FDD) and Time Division Duplex (TDD modes, reducing error rates and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the NPSS and NSSS are transmitted using fixed configurations, then the transmission is simple, but the radio frame structure cannot be accurately determined
Solution Approach 1:
The patent applies local quality by configuring different transmission parameters for NPSS and NSSS based on their specific functions and positions within the radio frame. The NPSS uses one set of configuration parameters while the NSSS uses different parameters, allowing accurate distinction between FDD and TDD modes without requiring uniform complex configuration across all synchronization signals.
Solution Approach 2:
The transmission configuration is made dynamic by adjusting the subframe indices and transmission periods of NPSS and NSSS according to the detected radio frame structure type. The system transitions from fixed configuration to adaptive configuration where the transmission parameters change based on the identified FDD or TDD mode, enabling accurate structure determination.
2Reliability
If blind detection is used to determine radio frame structure, then the system can identify different modes, but the error rate increases and complexity increases
Solution Approach 1:
The system employs feedback mechanisms where the UE detects the radio frame structure type through configured signal patterns and uses this information to adjust subsequent transmission parameters. The base station receives feedback about the detected structure type and configures NPSS, NSSS, and NPBCH transmissions accordingly, creating a reliable feedback loop that reduces errors.
Solution Approach 2:
The patent applies preliminary action by pre-configuring different transmission patterns for NPSS and NSSS corresponding to FDD and TDD modes before the actual communication begins. The UE can detect which pattern is used to identify the radio frame structure type, eliminating the need for complex blind detection and reducing error rates.
3Measurement precision
If the NPSS transmission frequency is increased, then the synchronization accuracy improves, but the analog filter band may be exceeded
Solution Approach 1:
The patent applies parameter changes by carefully adjusting the transmission frequency and timing parameters of the NPSS to optimize synchronization accuracy while remaining within the analog filter bandwidth. The system dynamically modifies transmission parameters such as subframe indices and transmission periods to achieve the right balance between synchronization performance and filter compliance.
Data Source
AI summary
Disclosed are a method for transmitting and receiving a synchronization signal in a wireless communication system supporting NarrowBand-Internet of Things (NB-IoT) and an apparatus therefor. Specifically, the method for transmitting and receiving a synchronization signal may include: receiving, from a base station, a narrowband synchronization signal; and performing a cell search procedure for the base station based on the narrowband synchronization signal, in which the narrowband synchronization signal may include a narrowband primary synchronization signal and a narrowband secondary synchronization signal, the narrowband primary synchronization signal and the narrowband secondary synchronization signal may be transmitted in different subframe, and the subframe in which the narrowband secondary synchronization signal is transmitted may be configured differently according to a type of a radio frame structure.