Extended PSS Synchronization in Carrier Aggregation Networks
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Solution Overview
Problem
In carrier aggregation wireless networks, interference between macro and sub base stations' overlapping coverage areas affects transmission performance, making it difficult for wireless communication devices to synchronize and maintain reliable communication.
Innovation Solution
The method involves transmitting extended primary synchronization signals (PSS) by both macro and sub base stations, with specific structures including periodic extensions, low-frequency, DC carrier, and high-frequency components, allowing wireless communication devices to synchronize using these signals even in interference-prone areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub base stations are deployed to improve indoor communication performance, then communication quality in overlapping coverage areas improves, but interference between macro and sub base stations increases
Solution Approach 1:
The synchronization signal is segmented into multiple frequency parts (low-frequency part, DC carrier, high-frequency part) with different structures. The sub base station uses an extended PSS with periodic extensions while the macro base station uses a traditional PSS, allowing wireless devices to distinguish and synchronize with the appropriate base station type, thereby reducing interference in overlapping coverage areas.
Solution Approach 2:
Different synchronization signal structures are assigned to different base station types (macro vs. sub) based on their local characteristics and coverage requirements. This localized differentiation enables wireless devices to adapt to the specific base station they are connecting to, improving indoor communication performance while managing interference through structure-based identification.
2Quantity of substance
If carrier aggregation is used to increase transmission bandwidth, then data transmission capacity improves, but synchronization complexity increases
Solution Approach 1:
The extended PSS includes periodic extensions that repeat the same data in both time and frequency domains. This redundancy allows wireless devices to achieve synchronization more reliably by detecting the repeating pattern, reducing the complexity of synchronization in carrier aggregation scenarios where multiple component carriers must be synchronized.
Solution Approach 2:
The synchronization signal structure is modified by introducing periodic extensions with specific frequency domain characteristics. The low-frequency and high-frequency parts carry the same data, creating a recognizable pattern that simplifies synchronization detection across multiple component carriers while maintaining the bandwidth benefits of carrier aggregation.
Data Source
AI summary
A carrier aggregation wireless network system and a base station (BS), a wireless communication device, and a synchronization method thereof are disclosed. The wireless communication device receives a wireless signal from the BS. The wireless signal includes a primary cell (pcell) and a secondary cell (scell). A subframe of the scell includes a first OFDM symbol and a second OFDM symbol. The first OFDM symbol includes an extended primary synchronization signal (PSS). The second OFDM symbol includes a PSS. The scell includes a secondary synchronization signal (SSS). The wireless communication device acquires synchronization according to the extended PSS and/or the PSS. In addition, the wireless communication device may also acquire synchronization according to a cell ID, the PSS, and the SSS.