Flexible Random Access Channels for Terrestrial and Aerial UEs
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing random access procedures due to timing uncertainty and interference among UEs, particularly between terrestrial and aerial UEs, leading to failed procedures, increased interference, and system latency.
Innovation Solution
Implementing flexible random access channel configurations by distinguishing between terrestrial and aerial UEs with separate sets of preamble parameters, including cyclic shifts, frequency and time resources, and allowing UEs to determine pre-compensation timing based on distance to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of random access preamble parameters is used for all UEs, then device complexity is reduced, but orthogonality of preambles deteriorates due to timing uncertainty between terrestrial and aerial UEs
Solution Approach 1:
The patent segments the random access preamble parameters into different sets based on UE type (terrestrial vs. aerial). The base station configures separate parameter sets including different cyclic shift values, allowing each UE type to use parameters optimized for its characteristics, thereby maintaining preamble orthogonality while managing complexity through structured classification.
Solution Approach 2:
The patent applies local quality by assigning different parameter characteristics to different UE types. Aerial UEs receive parameter sets with larger cyclic shift values to accommodate their greater timing uncertainty, while terrestrial UEs use parameter sets with smaller cyclic shift values. This localized parameter optimization maintains orthogonality for each UE type without requiring uniform parameters for all UEs.
2Reliability
If separate sets of preamble parameters are configured for different UE types, then preamble orthogonality is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by introducing a dynamic indication mechanism where the base station selects and indicates a specific parameter set from multiple configured sets based on current system conditions and UE characteristics. This allows the system to adaptively choose appropriate parameter sets, maintaining orthogonality while managing complexity through flexible, condition-based selection rather than static configuration.
Solution Approach 2:
The patent utilizes parameter changes by configuring multiple sets of preamble parameters with different characteristics (particularly different cyclic shift values) and dynamically selecting which set to use. The base station can change the active parameter set based on UE type identification, timing conditions, and system load, thereby maintaining orthogonality across different scenarios without requiring a completely separate configuration for each case.
3Reliability
If pre-compensation timing is determined based on distance, then random access success rate is improved, but measurement precision requirements increase
Solution Approach 1:
The patent applies preliminary action by having the base station indicate its location to the UE before the random access procedure, and the UE determining its own location and calculating the distance-based pre-compensation timing in advance. This pre-calculation of timing compensation based on known locations allows the UE to adjust its transmission timing proactively, improving random access success rate while using standard location measurement capabilities rather than requiring ultra-precise measurements during the access procedure itself.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may communicate with a base station in a wireless communications system. The UE may perform a random access procedure to communicate with the base station. The base station may configure the UE with different sets of preamble parameters for different types of UEs. The UE may generate a random access preamble based on the sets of preamble parameters according to the type of the UE. The base station may indicate a location of the base station to the UE. The UE may identify a location of the UE. The UE may determine a pre-compensation timing based on a distance from the two locations. The UE and the base station may transmit subsequent communication according to the random access preamble, the pre-compensation timing, or any combination thereof.