PRACH Transmission Random Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently establishing connections between user equipment (UE) and network entities due to inaccuracies in initial PRACH signal transmission power, leading to time and resource-intensive processes.
Innovation Solution
The implementation of random or pseudorandom power control for PRACH transmission, where the UE transmits multiple PRACH signals at randomly or pseudo-randomly selected power levels within a defined range, and adjusts the power range based on response messages from the network entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed power level is used for PRACH transmission, then device complexity is reduced, but measurement precision of transmission power accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed power level to a dynamic power selection mechanism. The UE randomly or pseudo-randomly selects power levels from a range during different time periods, allowing the system to adapt to varying channel conditions and improve transmission success probability without requiring complex real-time power control algorithms.
Solution Approach 2:
The patent changes the power parameter from a fixed value to a variable selected from a range. By modifying the power level parameter dynamically through random or pseudo-random selection, the system improves transmission power accuracy and connection establishment success while maintaining relatively simple device complexity.
2Reliability
If multiple PRACH signals are transmitted at multiple power levels, then connection establishment success rate is improved, but use of energy increases
Solution Approach 1:
The patent applies partial action by transmitting multiple PRACH signals with different power levels instead of using maximum power for all transmissions. The UE selects power levels from a defined range, using sufficient power to achieve successful connection establishment without excessive energy consumption, thereby balancing reliability improvement with energy efficiency.
3Measurement precision
If random or pseudorandom power levels are selected from a power range, then transmission power accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing pseudo-random selection based on a hash function that uses readily available parameters (such as cell ID, slot number, or UE ID) to generate power level selections. This approach provides good distribution across the power range without requiring external random number generators or complex control mechanisms, thereby improving transmission power accuracy while keeping device complexity low.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, and a network entity may receive, multiple physical random access channel (PRACH) signals at multiple power levels during a time period. The multiple power levels may be randomly or pseudo-randomly selected from within a power range defined for the PRACH signals. The UE may receive a response message indicating one or more of the PRACH signals of the multiple PRACH signals detected during the time period. The UE may transmit a random access request message at a first power level of the multiple power levels according to the one or more PRACH signals of the multiple PRACH signals detected during the time period.