Dynamic TTI Radio Frame for 5G Synchronization
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Solution Overview
Problem
Future radio communication systems, such as 5G, face challenges in providing ultra-high speed, large capacity, and low latency while supporting a large number of devices, particularly in high-frequency bands, and require new communication access schemes that differ from existing LTE systems to ensure adequate communication.
Innovation Solution
A user terminal and radio base station employing a radio frame with switchable transmission time intervals (TTIs) for dynamic downlink and uplink transmission, receiving synchronization and broadcast signals in dedicated TTIs, and using multiple numerologies with varying subcarrier spacing, symbol duration, and filtering processes to support high-frequency bands and diverse communication requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing LTE communication schemes are applied to new RAT for high-frequency bands, then device compatibility is maintained, but communication cannot be carried out adequately due to phase noise and coverage limitations
Solution Approach 1:
The patent changes key communication parameters including subcarrier spacing (increased for high-frequency bands), cyclic prefix length (extended to combat phase noise), and filter characteristics (modified for high-frequency phase noise compensation). These parameter changes enable adequate communication in high-frequency bands while maintaining LTE framework compatibility
2Productivity
If wide-band frequency spectra are used to meet ultra-high speed demands, then data capacity increases, but phase noise becomes more severe and coverage decreases
Solution Approach 1:
The patent increases subcarrier spacing proportionally with carrier frequency to maintain orthogonality in wide-band spectra. Extended cyclic prefixes are used to tolerate phase noise effects. These changes enable utilization of wide-band frequency spectra for ultra-high speed communication while compensating for increased phase noise through parameter optimization
3Adaptability or versatility
If dynamic TDD is used to allow flexible UL/DL switching, then resource allocation efficiency improves, but synchronization complexity increases
Solution Approach 1:
The patent introduces periodic synchronization signals (PSS/SSS) transmitted at regular intervals to maintain synchronization in dynamic TDD environments. This periodic structure allows flexible UL/DL switching while keeping synchronization manageable through predictable, repeating patterns that devices can easily track
4Ease of operation
If initial access procedures are simplified for new RAT, then device complexity is reduced, but access reliability may be compromised
Solution Approach 1:
The patent performs preliminary synchronization and cell identification using PSS/SSS before main data transmission begins. This preliminary action establishes timing and frequency synchronization upfront, simplifying subsequent access procedures while ensuring reliability through proper synchronization establishment before communication starts
Data Source
AI summary
The present invention is designed to realize appropriate communication in next generation communication systems. a control section that controls communication by using a radio frame that includes a plurality of transmission time intervals (TTIs), in which the downlink and the uplink can be switched, and a given TTI, which is for DL transmission and which is configured in a given cycle, and a receiving section that receives a synchronization signal and a broadcast signal in the given TTI are provided.