Uplink DMRS π/2-BPSK Modulation for Low PAPR
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Solution Overview
Problem
In next-generation mobile communication systems, the coexistence of π/2-BPSK and non-π/2-BPSK uplink transmissions hinders performance improvement, particularly in achieving low peak-to-average power ratio (PAPR) for uplink transmissions.
Innovation Solution
A user terminal employing π/2-BPSK modulation for demodulation reference signals (DMRS) in uplink transmissions, before radio resource control (RRC) connection establishment, to facilitate appropriate uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If π/2-BPSK modulation is used for uplink transmission, then peak-to-average power ratio is reduced, but coexistence with non-π/2-BPSK transmission prevents performance improvement
Solution Approach 1:
The patent applies different modulation schemes to different uplink channels based on their specific requirements. π/2-BPSK modulation is applied specifically to the demodulation reference signal (DMRS) in the uplink shared channel, while other channels can use different modulation schemes. This localized application allows each channel to have optimal characteristics for its function, resolving the contradiction between achieving low PAPR and maintaining system versatility.
2Reliability
If π/2-BPSK modulation is used before RRC connection establishment, then uplink channel quality is improved, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent enables π/2-BPSK modulation for DMRS before RRC connection establishment, allowing the uplink channel quality to be optimized in advance during the random access procedure. By preparing and configuring the modulation scheme beforehand, the system achieves improved uplink channel quality without requiring complex real-time control mechanisms during the connection establishment process.
Data Source
AI summary
A user terminal according to one aspect of the present disclosure includes a transmitting section that transmits a demodulation reference signal (DMRS) based on π/2-BPSK modulation in uplink transmission of at least one of an uplink shared channel and an uplink control channel, before radio resource control (RRC) connection establishment, and a control section that performs the RRC connection establishment, based on the uplink transmission. According to an aspect of the present disclosure, it is possible to appropriately perform uplink transmission employing π/2-BPSK modulation.