Sidelink Synchronization Signal Block Transient Power Reduction
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Solution Overview
Problem
In 5G NR wireless communication systems, the transmission of sidelink synchronization signal blocks (S-SSBs) with different peak-to-average power ratio (PAPR) values for sidelink primary synchronization signals (S-PSS) and sidelink secondary synchronization signals (S-SSS) leads to transient power changes, affecting spectral efficiency and performance due to the need for automatic gain control (AGC) in user equipment (UE).
Innovation Solution
Configuring S-SSBs with a gap symbol as the last symbol and positioning S-SSS symbols adjacent to it, or configuring S-SSBs with S-PSS and S-SSS symbols having similar maximum power reduction (MPR) values to eliminate or reduce transient periods, thereby improving spectral efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If S-SSBs are transmitted with different PAPR values for S-PSS and S-SSS, then synchronization signal diversity is achieved, but transient power changes occur affecting spectral efficiency
Solution Approach 1:
The patent applies parameter changes by adjusting the PAPR values of S-PSS and S-SSS to be equal, thereby eliminating transient power changes during S-SSB transmission. This parameter adjustment resolves the contradiction by maintaining spectral efficiency while still providing synchronization functionality through the structured signal design.
Solution Approach 2:
The patent creates equipotentiality by ensuring that S-PSS and S-SSS have equal PAPR values, eliminating power fluctuations during transmission. This equalization of power parameters prevents the need for repeated power amplifier adjustments, thereby maintaining spectral efficiency while achieving synchronization signal diversity.
2Reliability
If S-SSBs include multiple symbols with different power levels, then signal robustness is improved, but automatic gain control adjustments are required reducing transmission efficiency
Solution Approach 1:
The patent changes the power parameter by setting equal PAPR values for S-PSS and S-SSS, eliminating the need for AGC adjustments during S-SSB transmission. This maintains signal robustness through proper synchronization signal design while avoiding energy loss from repeated power amplifier retuning.
3Reliability
If transient periods are present in S-SSB transmission, then power amplifier protection is achieved, but spectral efficiency deteriorates
Solution Approach 1:
The patent eliminates transient periods by changing the PAPR parameters of S-PSS and S-SSS to be equal. This removes the need for power amplifier protection mechanisms while maintaining reliable transmission, thereby improving spectral efficiency without sacrificing power amplifier reliability.
Data Source
AI summary
Apparatus and methods for S-SSB transmission are provided. In an aspect, an S-SSS symbol is followed by a gap symbol. In another aspect, a first PSBCH symbol is followed by an S-SSS symbol. In a further aspect, the same MPR is used for the entire S-SSB, thus reducing/mitigating transient periods. For example, the S-SSS symbols in the S-SSB may be selected from a set of sequences having the same MPR as the S-PSS symbols. Alternatively, the MPR of the entire S-SSB may be selected based on a sequence ID of an S-SSS. In an aspect, additional symbols may be configured in the S-SSB to compensate for power reduction.