Random Access Occasion Configuration for NTN Delay Separation
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Solution Overview
Problem
In Non-terrestrial Networks (NTN), the large differential delays experienced by user equipment (UEs) in different locations lead to overlapping preamble receiving windows, necessitating a reduction in the number of supported UEs to avoid ambiguity, which existing solutions either sacrifice UE density or require large time intervals between Random Access Channel (RACH) occasions.
Innovation Solution
Configuring random access occasions based on UE parameters such as propagation delay, timing advance, and location to accurately assign UEs to specific RACH occasions, allowing for non-overlapping preamble receiving windows and increased UE density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the time interval between consecutive RACH occasions is reduced to increase UE density, then the number of supported UEs increases, but the preamble receiving windows overlap causing ambiguity
Solution Approach 1:
The patent applies local quality by configuring different random access occasion parameters (time, frequency, code) for different UE groups based on their specific propagation delays and locations. Instead of using a uniform configuration for all UEs, the system tailors the RACH occasion configuration to each UE's local characteristics, ensuring non-overlapping receiving windows for different UE groups while maintaining high UE density.
Solution Approach 2:
The patent segments the UE population into multiple groups based on their propagation delays and locations. Each group is assigned dedicated RACH occasions with specific time-frequency-code resources. This segmentation prevents preamble receiving window overlaps between different UE groups, allowing the system to support a large number of UEs simultaneously without ambiguity in preamble reception.
2Reliability
If the preamble receiving window is extended to accommodate large differential delays, then all UEs can be received, but the time interval between consecutive RACH occasions must be increased, reducing UE density
Solution Approach 1:
The patent implements dynamics by making the RACH occasion configuration adaptive to each UE's specific propagation delay and location. The system dynamically adjusts the time, frequency, and code parameters of RACH occasions for different UE groups. This dynamic configuration allows the system to accommodate large differential delays while maintaining short time intervals between RACH occasions, thus preserving high UE density.
Solution Approach 2:
The patent changes multiple parameters (time, frequency, code) of the random access occasions based on UE-specific propagation delays and locations. By adjusting these parameters dynamically, the system can accommodate varying delay characteristics without requiring a uniform extension of the preamble receiving window for all UEs, thereby maintaining high UE density while ensuring complete preamble reception.
3Device complexity
If a uniform random access configuration is used for all UEs, then the system is simple to implement, but UEs in different locations experience overlapping receiving windows due to large differential delays
Solution Approach 1:
The patent transitions from a uniform configuration to a localized configuration where different UE groups receive tailored RACH occasion parameters based on their specific propagation delays and locations. This local quality approach maintains relative simplicity in implementation through group-based configuration while effectively preventing receiving window overlaps and ensuring distinct preamble reception for different UE groups.
Data Source
AI summary
The present application relates to a method and an apparatus for random access resource configuration. One embodiment of the present application provides a method performed by a Base Station (BS), which includes: transmitting random access occasion configuration, wherein the random access occasion configuration is associated with at least one of the following parameters of a UE: a propagation delay, a timing advance, a location, and a distance; and receiving preambles in a preamble receiving window corresponding to the random access occasion configuration.