Time Domain PSS Implementation for LTE Downlink Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LTE downlink physical layer processing is inefficient due to time overhead generated by RE mapping in the frequency domain, which prolongs the processing time for the LTE downlink physical layer link.
Innovation Solution
Implementing the Primary Synchronization Signal (PSS) in the time domain by pre-storing PSS time domain sequences with different sampling rates and NID2 configurations, performing power weighting on these sequences, and adding them to time domain data of other signals and channels, thereby avoiding the time overhead of frequency domain RE mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSS is implemented in the frequency domain according to LTE physical layer protocol definitions, then PSS generation and mapping can be completed following standard specifications, but time overhead is generated during RE mapping which prolongs processing time
Solution Approach 1:
The patent inverts the conventional frequency-domain PSS implementation approach by implementing PSS directly in the time domain. Instead of generating PSS in frequency domain and then performing IFFT and RE mapping, the patent generates time-domain PSS sequences directly, performs power control, and maps them to time-domain resource elements, thereby eliminating the time overhead of frequency-domain processing while maintaining all PSS functions
Solution Approach 2:
The patent extracts the PSS processing steps from the conventional frequency-domain processing chain. By separating PSS generation and mapping from the frequency-domain RE mapping process and implementing them independently in the time domain, the patent removes the unnecessary time overhead associated with frequency-domain processing while preserving essential PSS functions
2Ease of manufacture
If RE mapping is performed in the frequency domain for PSS, then mapping of RE sampling points in series can be achieved, but certain time overhead is generated which prolongs LTE downlink physical layer processing time
Solution Approach 1:
The patent inverts the processing domain from frequency domain to time domain for PSS mapping. By performing RE mapping directly in the time domain where PSS sequences are generated, the patent eliminates the sequential frequency-domain mapping process and its associated time overhead, thereby improving processing efficiency while maintaining implementation feasibility
3Reliability
If frequency/time domain conversion (IFFT) is performed after frequency domain processing, then time domain data can be obtained, but the overall processing time is increased
Solution Approach 1:
The patent extracts PSS processing from the conventional frequency-domain processing chain that requires IFFT conversion. By implementing PSS generation, power control, and mapping directly in the time domain, the patent removes the unnecessary IFFT conversion step for PSS while maintaining complete signal processing functionality, thereby reducing overall processing time
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Disclosed is a method for implementing a Primary Synchronization Signal (PSS) in the time domain, including that: PSS time domain sequences with different sampling rates and with configuration represented by NID2 are pre-stored; a PSS time domain power weighting related parameter is obtained according to a PSS power control related parameter, a cell related parameter and timing information; power weighting processing is performed on the PSS time domain sequences to obtain weighted PSS time domain sequences according to the pre-stored PSS time domain sequences with different sampling rates and with configuration represented by NID2 and the PSS time domain power weighting related parameter; and addition operation is performed on the weighted PSS time domain sequences and time domain data of signals and channels other than the PSS. Also disclosed are an apparatus for implementing a PSS in the time domain and a computer storage medium.