2-Step Random Access Terminal Using Pi/2 BPSK Modulation
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Solution Overview
Problem
Modulation schemes such as π/2 binary phase shift keying (BPSK) and demodulation reference signal (DMRS) sequences based on π/2 BPSK cannot be effectively used in a 2-step random access (2SR) procedure, resulting in limited transmit power of a terminal, affecting transmission efficiency and coverage performance.
Innovation Solution
A method for 2-step random access in a terminal, which involves receiving configuration information for 2-step random access and determining a transmission resource and/or transmission mode based on the configuration information and assistance uplink transmission information, allowing for effective use of modulation schemes like π/2 BPSK.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If modulation schemes such as π/2 BPSK and DMRS sequences based on π/2 BPSK are used in 2-step random access procedure, then transmission efficiency and coverage performance are improved, but terminal transmit power is limited
Solution Approach 1:
The patent changes the modulation scheme parameter from conventional schemes to π/2 BPSK specifically for the random access preamble and DMRS sequences. This parameter change enables better power efficiency and coverage performance while maintaining compatibility with the existing 2-step random access framework, resolving the contradiction between transmission efficiency and power limitations.
2Reliability
If modulation schemes such as π/2 BPSK and DMRS sequences based on π/2 BPSK are used in 2-step random access procedure, then coverage performance is improved, but terminal transmit power is limited
Solution Approach 1:
The patent applies π/2 BPSK modulation to the random access preamble and DMRS sequences, changing the modulation parameter to achieve superior coverage performance. This modulation scheme provides better robustness against channel conditions and extends coverage area while managing terminal power constraints effectively.
3Power
If conventional modulation schemes are used in 2-step random access procedure, then terminal transmit power limitations are avoided, but transmission efficiency and coverage performance are degraded
Solution Approach 1:
The patent introduces π/2 BPSK modulation as a specific parameter change for random access transmissions, achieving both power efficiency and high transmission efficiency. This modulation parameter optimization allows the system to overcome the trade-off between power limitations and transmission efficiency by selecting the most appropriate modulation parameter for the random access scenario.
Data Source
AI summary
Embodiments of this disclosure provide a method for 2-step random access and a terminal. The method includes: receiving one or more pieces of configuration information for 2-step random access; and determining a transmission resource and/or a transmission mode based on the configuration information and assistance uplink transmission information, and performing uplink transmission.