2-Step RACH Power Control for Adaptive MsgA Uplink Access
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Solution Overview
Problem
Conventional RACH parameter settings do not account for real-world deployment scenarios, traffic and interference conditions, and network configuration changes, failing to optimize latency and power transmission levels.
Innovation Solution
A system that determines transmission power for the physical uplink shared channel (PUSCH) based on the associated PRACH power and a power offset, with power ramping until maximum power is reached, and prioritizes power reduction for uplink signals in 2-step RACH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If predetermined RACH parameter settings are used, then device complexity is reduced, but adaptability to real-world deployment scenarios and varying network conditions deteriorates
Solution Approach 1:
The patent implements dynamic RACH parameter adjustment by allowing the network to configure power offset values (deltaPreambleMsgA, deltaMsg3) and power ramping parameters based on real-time network conditions, traffic patterns, and deployment scenarios. This enables the system to adapt to varying conditions while maintaining manageable complexity through centralized network control.
Solution Approach 2:
The patent changes physical parameters (transmission power levels, power offsets) based on network conditions and traffic requirements. The network can dynamically adjust PUSCH and PRACH power parameters to optimize performance for different deployment scenarios, user densities, and interference conditions without requiring complex device-side algorithms.
2Ease of operation
If predetermined RACH parameter settings are used, then ease of operation is improved, but optimization of latency and power transmission levels deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors RACH success rates, latency metrics, and power utilization, then dynamically adjusts power offset parameters and ramping configurations. This feedback loop enables latency optimization while maintaining ease of operation through automated network-side control rather than manual device configuration.
Solution Approach 2:
The network performs preliminary configuration of power parameters based on historical data and predicted traffic patterns, pre-optimizing RACH parameters for anticipated conditions. This allows the system to be proactive in reducing latency rather than reactive, while keeping operational complexity low through automated forecasting and configuration.
3Reliability
If transmission power is increased to improve reliability, then power transmission effectiveness is improved, but energy consumption increases
Solution Approach 1:
The patent dynamically changes power transmission parameters (PUSCH power offset, PRACH power ramping steps) based on network conditions, user equipment capabilities, and channel quality. This enables the system to use higher power only when necessary for reliability while consuming less energy during normal operations, achieving an optimal balance between reliability and energy efficiency.
Solution Approach 2:
The system implements dynamic power control where transmission power levels are adjusted in real-time based on path loss measurements, network load, and success probability targets. This dynamic adjustment ensures sufficient power for reliable access while minimizing energy consumption by avoiding unnecessarily high transmission levels during good channel conditions.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are provided for power control aspects for message A (MsgA) physical uplink shared channel (PUSCH). The approach includes determining a transmission power for a PUSCH associated with a physical random access channel (PRACH) in a 2-step random access channel (RACH) mode, where the transmission power for the PUSCH is determined based on a transmission power of the associated PRACH and a power offset. The approach further includes ramping up a transmission power of the PRACH and PUSCH until a maximum transmission power is reached.