Dynamic PRACH Preamble Configuration for Wireless Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication networks face performance issues due to static preamble length configurations in the physical random-access channel (PRACH), which result in either poor performance with high received signal energy or higher capacity with worse performance, depending on the preamble length chosen.
Innovation Solution
A method and apparatus that dynamically determine the preamble configuration parameters, including length, subframe configuration, sequence configuration, and frequency resources, based on signal strength and network load measurements, allowing the radio-network node to transmit these parameters to the wireless device for an optimized random-access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long preamble is used in PRACH, then the received signal energy is high, but the network capacity is reduced
Solution Approach 1:
The patent applies dynamics by making the preamble length adjustable rather than fixed. The radio-network node dynamically selects between short and long preamble configurations based on real-time network load conditions, allowing the system to adapt its characteristics to current operational requirements rather than being constrained by a static configuration
Solution Approach 2:
The patent changes the physical parameter of preamble length based on network conditions. By modifying this parameter dynamically - using long preambles when network load is low (to ensure high received signal energy) and short preambles when network load is high (to maximize network capacity) - the system optimizes the trade-off between reliability and productivity
2Productivity
If a short preamble is used in PRACH, then the network capacity is high, but the received signal energy is low
Solution Approach 1:
The system dynamically adjusts preamble length based on network load, switching to short preambles during high-load conditions to maximize network capacity while accepting the trade-off of reduced received signal energy, and switching to long preambles during low-load conditions to ensure adequate signal energy
Solution Approach 2:
The patent modifies the preamble length parameter in response to changing network conditions, allowing the system to optimize for network capacity when load is high by using short preambles, and optimize for signal energy when load is low by using long preambles
3Ease of manufacture
If static preamble configuration is used, then the system is simple to implement, but the network performance is poor under varying load conditions
Solution Approach 1:
The patent introduces dynamic adaptation to network load conditions while maintaining relatively simple implementation. The radio-network node monitors network load and automatically selects appropriate preamble configurations, providing performance optimization without requiring complex manual configuration or intervention
Solution Approach 2:
The system performs self-configuration by automatically adjusting preamble length based on its own monitoring of network load conditions. The radio-network node independently determines the appropriate preamble configuration without external intervention, optimizing performance while keeping the system simple to implement
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
Embodiments herein relate to a method performed by a radio-network node (12) for handling access to the radio-network node (12) from a wireless device (10) in the wireless communication network (1). The radio-network node determines one or more preamble configuration parameters indicating a length of a preamble for a physical random-access channel, PRACH, for the wireless device (10) based on one or more signal strength or quality measurements, and/or a load in the wireless communication network (1). The radio network node further transmits an indication of the determined one or more preamble configuration parameters to the wireless device.