Enhanced Primary Synchronization Signal Burst for LTE Cell Search
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Solution Overview
Problem
Current LTE systems face challenges in providing efficient cell synchronization for User Equipment (UE) in marginal signal strength conditions, leading to high power consumption and prolonged detection times, especially when Discontinuous Reception (DRX) is employed.
Innovation Solution
The implementation of an enhanced Primary Synchronization Signal (ePSS) is introduced, which involves transmitting multiple copies of the PSS within a short time frame, allowing UEs to receive and decode the signal more quickly, thereby reducing detection time and energy expenditure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard PSS detection methods are used, then cell synchronization can be achieved, but detection time and energy consumption increase significantly in marginal signal conditions
Solution Approach 1:
The patent segments the synchronization process into two distinct phases: cell search (detecting PSS/SSS) and random access (sending preamble). By separating these functions and allowing the UE to proceed with random access using partial synchronization information, the detection time is reduced without sacrificing overall connection reliability.
Solution Approach 2:
The patent enables preliminary synchronization actions where the UE can perform cell search and obtain partial synchronization information without completing the full detection process. This preliminary action allows the UE to proceed with random access earlier, reducing total time while maintaining reliability through subsequent synchronization steps.
2Reliability
If standard PSS detection methods are used, then cell synchronization can be achieved, but energy consumption increases significantly in marginal signal conditions
Solution Approach 1:
By segmenting the synchronization and access processes, the patent allows UEs to complete cell search with reduced energy expenditure and proceed to random access. The separation eliminates the need for prolonged signal detection, significantly reducing energy consumption while maintaining synchronization reliability through the two-stage approach.
Solution Approach 2:
The patent applies partial action by allowing UEs to perform sufficient cell search to obtain basic synchronization information without completing exhaustive detection. This partial synchronization is adequate for proceeding to random access, reducing energy consumption while maintaining sufficient reliability for network entry.
3Reliability
If multiple PSS copies are transmitted, then detection rate improves in low SNR conditions, but signal transmission complexity increases
Solution Approach 1:
The patent segments the signal structure by transmitting multiple PSS copies only in the enhanced coverage scenario, while maintaining standard single-copy transmission for normal conditions. This segmentation allows improved detection rate where needed without universally increasing transmission complexity across all operating conditions.
Solution Approach 2:
The patent changes the transmission parameter (number of PSS copies) based on coverage conditions. In enhanced coverage mode, multiple copies are transmitted to improve detection rate in low SNR conditions, while in normal coverage, standard single-copy transmission is maintained, avoiding unnecessary complexity.
Data Source
AI summary
A method and system for facilitating operational adjustment of a User Equipment (UE) to a Long Term Evolution (LTE) cell serviced by an evolved NodeB (eNB). The eNB transmits a burst of multiple signals, each indicative of a Primary Synchronization Signal (PSS), and transmitted within a predetermined time frame. The UE, receives at least one signal of the burst, decodes the PSS based on the received at least one signal, and performs the operational adjustment based on the decoded PSS. The operational adjustment can include performing synchronization of the UE to the LTE cell and/or acquiring symbol timing of the LTE cell.