Preamble Sequence Configuration for Propagation Delay Adaptation
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Solution Overview
Problem
Existing random access procedures in 5G NR systems do not adequately account for varying propagation delays between terminals and base stations, particularly in non-terrestrial networks (NTNs) where delay differences are significant.
Innovation Solution
The implementation of a transmission and reception apparatus/method that configures a preamble sequence from multiple candidates, where at least one candidate is composed of two or more distinct code sequences, to facilitate an appropriate random access procedure based on propagation delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional random access procedure is used in 5G NR systems, then the procedure is simple and standardized, but it cannot accommodate varying propagation delays in non-terrestrial networks
Solution Approach 1:
The patent applies dynamics by making the random access procedure adaptable to varying propagation delays through dynamic configuration of preamble sequences. The base station configures multiple preamble sequence candidates with different properties (cyclic shifts, root indices) that correspond to different delay ranges, allowing the system to dynamically select appropriate sequences based on actual propagation conditions in NTN environments.
Solution Approach 2:
The patent changes parameters of the random access procedure by introducing multiple preamble sequence candidates with varying parameters (root indices, cyclic shift amounts, sequence lengths). These parameter variations enable the system to accommodate different propagation delay characteristics without fundamentally changing the random access protocol structure, thus balancing adaptability with complexity.
2Reliability
If multiple preamble sequence candidates with different code sequences are configured, then the random access procedure can accommodate propagation delay variations, but the configuration complexity increases
Solution Approach 1:
The patent segments the preamble sequence space into multiple candidates, each optimized for specific propagation delay ranges. By dividing the available preamble sequences into distinct candidates with different root indices and cyclic shift configurations, the system can segment the coverage area into delay-based zones, improving reliability for terminals in different propagation conditions while keeping each individual candidate relatively simple.
Solution Approach 2:
The patent achieves universality by designing a preamble sequence configuration framework that can serve multiple functions: supporting both terrestrial and non-terrestrial networks, accommodating various propagation delay ranges, and maintaining compatibility with existing 5G NR random access procedures. The multi-functional design allows the same mechanism to improve reliability across diverse network scenarios without requiring separate procedures for each case.
Data Source
AI summary
The present invention provides a transmission device, a reception device, a transmission method, and a reception method that implement an appropriate random access procedure in accordance with a propagation delay between a terminal and a base station. A terminal (100) is provided with a wireless transmission unit (103) which transmits a random access channel signal, and a control unit (107) which sets, from among a plurality of preamble sequence candidates, a preamble sequence for use in the random access channel signal. At least one of the plurality of preamble sequence candidates is composed of two or more mutually different code sequences.