Sidelink Subframe Power Boosting for V2X Spectrum Efficiency
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Solution Overview
Problem
Existing sidelink communication technologies in LTE/LTE-A systems restrict the use of first and final OFDM/SC-FDMA symbols, limiting frequency spectrum efficiency due to hardware restrictions and coexistence with existing LTE/LTE-A communication, which affects V2X UE performance.
Innovation Solution
The method involves transmitting data signals and reference signals with boosted power in specific resource elements of the first and last symbols of a sidelink subframe, using periodicities NRPT_0 and NRPT_L, respectively, to enhance transmission power without puncturing these symbols, thereby improving frequency spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first and final OFDM/SC-FDMA symbols are not used for V2X transmission, then hardware restrictions and coexistence with LTE/LTE-A communication are satisfied, but frequency spectrum efficiency is limited
Solution Approach 1:
The patent applies power boosting specifically to resource elements in the first and final symbols rather than uniformly across all symbols. This local quality enhancement allows selective utilization of previously restricted symbols while maintaining compatibility with LTE/LTE-A systems, thereby improving frequency spectrum efficiency without compromising coexistence reliability
Solution Approach 2:
The patent changes the transmit power parameter for specific resource elements in the first and final symbols by applying a power boosting factor. This parameter change enables the system to utilize these symbols for V2X transmission while maintaining backward compatibility with LTE/LTE-A communication through controlled power adjustment
2Reliability
If transmit power is boosted in specific resource elements, then reception performance and transmission distance are improved, but power consumption increases
Solution Approach 1:
Power boosting is applied locally only to specific resource elements in the first and final symbols rather than uniformly across all transmissions. This targeted approach improves reception performance and extends transmission distance while minimizing overall power consumption by limiting the boosted power application to only where necessary
Solution Approach 2:
The patent applies partial power boosting only to the extent necessary in specific resource elements rather than excessive uniform boosting across all symbols. This partial action achieves the required reception performance and transmission distance improvement while controlling power consumption through selective rather than comprehensive power enhancement
Data Source
AI summary
The disclosure of the present invention proposes a method for performing a transmission on a sidelink subframe. The method may comprise: performing the transmission on the sidelink subframe. The sidelink subframe may include a plurality of symbols in a time domain, each of which includes a plurality of resource elements (REs) in a frequency domain. The transmission may include transmitting at least one of a first data signal and a first reference signal (RS), which is repeated in one or more REs in a last symbol with a periodicity of NRPT_L, The one or more REs having the periodicity of NRPT_L in the last symbol may have a boosted transmit power for transmitting the at least one of the first data signal and the first RS.