5G Terminal SRS Partial Band Dropping for Power Control
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Solution Overview
Problem
In 5G new radio access technology, multi-PB SRSs increase CM/PAPR, leading to reduced maximum transmission power and inaccurate uplink quality estimation at base stations due to power-limited terminals.
Innovation Solution
A terminal circuit drops excess partial bands when transmission power exceeds a threshold, allowing remaining bands to transmit reference signals, enabling precise uplink quality estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multi-PB SRSs are transmitted using multiple sequences, then the bandwidth coverage is improved, but the CM/PAPR increases and maximum transmission power decreases
Solution Approach 1:
The patent segments the transmission bandwidth into multiple partial bands, where each partial band uses a separate ZC sequence. This segmentation allows the system to achieve wide bandwidth coverage while controlling CM/PAPR by limiting each sequence to a smaller frequency range, thereby resolving the contradiction between bandwidth coverage and transmission power.
Solution Approach 2:
The patent applies partial action by transmitting SRS signals in selected partial bands rather than using all available bandwidth simultaneously. When power limitations are detected, the system transmits only in certain partial bands (excluding others), thus maintaining acceptable CM/PAPR levels while still providing useful uplink quality estimation coverage.
2Measurement precision
If multi-PB SRSs are transmitted with high power, then the signal quality is improved, but the power amplifier operates outside linear region and distortion increases
Solution Approach 1:
The patent changes the CM/PAPR parameter by using multiple shorter ZC sequences instead of one long sequence. This parameter change reduces the peak power requirements, allowing the power amplifier to operate in its linear region while maintaining sufficient signal quality for accurate uplink estimation, thus resolving the contradiction between signal quality and distortion.
3Area of stationary object
If the sequence length is increased to cover wider bandwidth, then the bandwidth coverage is improved, but the CM/PAPR increases
Solution Approach 1:
The patent divides the wide bandwidth into multiple partial bands, each covered by a separate ZC sequence of appropriate length. This segmentation achieves the desired bandwidth coverage while keeping each individual sequence length manageable, thereby controlling CM/PAPR and resolving the contradiction between bandwidth coverage and CM/PAPR generation.
Data Source
AI summary
In a terminal, an SRS drop control unit drops a portion of partial bands from among a plurality of partial bands in a case where transmission power for reference signals generated using a plurality of sequences having a sequence length that corresponds to a partial band exceeds a threshold value. Furthermore, a radio transmission unit transmits the reference signals by means of the remaining partial bands other than the portion of partial bands that are dropped from among the plurality of partial bands.