Extended Synchronization Signal for mmWave Beam Selection
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Solution Overview
Problem
Current mobile communication systems face challenges in accommodating high-frequency bands, particularly in mmWave cellular systems, due to high pathloss and the need for advanced synchronization signals that can efficiently transmit and receive data with low latency and high energy efficiency.
Innovation Solution
The method involves generating extended synchronization signals using scrambling codes and orthogonal cover codes, which include positional information of symbols in subframes, and using these signals to achieve time and frequency synchronization with base stations, while also conveying beam-related information for optimal beam selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extended synchronization signals are generated using scrambling codes and orthogonal cover codes, then symbol timing synchronization and beam-related information transmission are improved, but device complexity and signal processing overhead increase
Solution Approach 1:
The extended synchronization signal is segmented into multiple components: primary synchronization signal (PSS), secondary synchronization signal (SSS), and extended synchronization signal (ESS). Each component serves a specific function - PSS for initial timing acquisition, SSS for cell ID identification, and ESS for symbol timing and beam information. This segmentation allows the system to achieve precise symbol timing synchronization while managing processing complexity by dividing the signal into functional modules.
Solution Approach 2:
The extended synchronization signal structure is designed to perform multiple functions simultaneously: it provides symbol timing synchronization, transmits beam-related information (such as beam index and beam quality), and maintains backward compatibility with existing synchronization mechanisms. By embedding multiple information types within a unified signal framework, the system improves measurement precision without proportionally increasing device complexity.
2Reliability
If extended synchronization signals are transmitted repeatedly for each beam, then beam selection accuracy and synchronization reliability are improved, but transmission overhead and loss of time increase
Solution Approach 1:
The extended synchronization signal is transmitted periodically with a defined period configuration that balances reliability and timing loss. The periodic transmission allows receiving devices to accumulate synchronization information over multiple instances while maintaining awareness of signal timing patterns. This periodic structure ensures that beam-related information is reliably delivered without requiring continuous transmission, thus limiting time loss.
Solution Approach 2:
The extended synchronization signal is transmitted in advance before actual data transmission begins, allowing receiving devices to pre-acquire symbol timing synchronization and beam selection information. This preliminary action enables devices to prepare their reception parameters beforehand, improving synchronization reliability while confining the additional transmission time to an initial setup phase rather than extending throughout the entire communication session.
3Measurement precision
If extended synchronization signals include positional information of symbols in subframes, then time synchronization precision is improved, but information overhead and device complexity increase
Solution Approach 1:
The extended synchronization signal merges multiple information elements into a single integrated signal structure: symbol timing information, beam-related information, and positional information of symbols within subframes are combined rather than transmitted separately. This merging reduces the total overhead compared to transmitting distinct signals for each information type, while still providing comprehensive time synchronization precision and beam selection data.
Data Source
AI summary
Disclosed in the present specification is a method by which a terminal transmits and receives a synchronization signal in a wireless communication system, comprising the steps of: receiving, from a base station, a synchronization signal and an extended synchronization signal, which are repeatedly transmitted a predetermined number of times for each beam; acquiring time and frequency synchronization with the base station on the basis of the received synchronization signal and the received extended synchronization signal; and receiving a beam reference signal related to beam selection from the base station.