SRS Hopping Scheme for Multi-Antenna Port Power Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face challenges in efficiently transmitting sounding reference signals (SRS) across multiple antenna ports due to reduced transmit power and throughput, especially when reference signals are transmitted simultaneously in a single OFDM symbol, lacking mechanisms for SRS sequence generation and mapping to resource elements.
Innovation Solution
Implementing an SRS hopping scheme that allows different SRS sequences and comb or cyclic shift offsets for each OFDM symbol set or symbol, along with a power normalization factor based on the number of antenna ports and OFDM symbols, to enhance transmit power and efficiency by distributing antenna ports across multiple OFDM symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If reference signals are transmitted simultaneously in a single OFDM symbol, then transmission time is reduced, but transmit power and throughput are reduced
Solution Approach 1:
The patent segments the transmission of reference signals across multiple OFDM symbols instead of transmitting all simultaneously in a single symbol. Each antenna port's reference signal is transmitted in a dedicated OFDM symbol, which allows the transmit power to be concentrated on each symbol rather than divided across multiple simultaneous transmissions. This segmentation resolves the contradiction by sacrificing one time unit (using multiple symbols) to gain power concentration and improved throughput.
2Loss of time
If reference signals are transmitted simultaneously in a single OFDM symbol, then transmission time is reduced, but throughput is reduced
Solution Approach 1:
The patent divides the reference signal transmission across multiple OFDM symbols, with each antenna port assigned to a specific symbol. This segmentation enables the receiver to process each antenna port's reference signal separately without interference, improving channel estimation accuracy and overall system throughput. The trade-off of increased transmission time is accepted to achieve better throughput through improved signal quality and reduced interference.
3Productivity
If SRS sequences are hopped across OFDM symbols, then signaling efficiency is improved, but sequence generation complexity increases
Solution Approach 1:
The patent implements dynamic SRS sequence hopping where the sequence used in each OFDM symbol changes based on a hopping pattern. This dynamic approach improves signaling efficiency by providing better channel sounding accuracy through diverse sequences, which helps in capturing time-varying channel characteristics. The complexity increase is managed through structured hopping patterns that can be generated using simple algorithms based on symbol index and configuration parameters.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. One or more user equipment (UEs) and network entities may communicate signaling using an SRS hopping scheme based on a numerical quantity of orthogonal frequency division multiplexing (OFDM) symbols in each set of OFDM symbols in a sounding reference signal (SRS) resource. Additionally, or alternatively, the UEs and the network entities may communicate signaling using a power normalization factor that depends on the numerical quantity of OFDM symbols and a numerical quantity of antenna ports for the SRS. In some examples, a network entity may indicate the numerical quantity of antenna ports, the numerical quantity of OFDM symbols in each OFDM symbol set, or both to a UE in control signaling. The UE may transmit the SRS to the network entity using the SRS resource and in accordance with the SRS hopping scheme, the power normalization factor, or both.