Two-Part Random Access Preamble for Large Time Delay Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining time delays between base stations and user equipment, especially at large distances, which complicates the detection of preambles and can result in increased complexity and collision risks during random access procedures.
Innovation Solution
A two-part preamble structure is introduced, where the first part is used by the base station to determine time delays and the second part is used for identification, allowing for efficient detection of large time delays and reducing processing complexity, with both parts potentially using OFDM symbols generated from m-sequences or Zadoff-Chu sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single preamble structure is used for random access, then the system is simpler to implement, but it cannot accurately determine large time delays at large distances
Solution Approach 1:
The preamble is divided into two distinct parts: a first part (preamble A) for time delay detection and a second part (preamble B) for identification. This segmentation allows each part to be optimized for its specific function, enabling accurate large time delay measurement while maintaining manageable system complexity through specialized processing for each part.
2Measurement precision
If the preamble structure is optimized for large time delays, then detection accuracy improves, but processing complexity increases
Solution Approach 1:
The time delay detection function is extracted from the identification function by separating the preamble into two parts. The first part is specifically designed and processed for time delay measurement, while the second part handles identification. This extraction allows optimized processing for large time delays without requiring the entire system to handle all complexities simultaneously.
3Adaptability or versatility
If more preambles are used to support more user equipment, then the system capacity increases, but collision risks increase
Solution Approach 1:
By segmenting the preamble into two functional parts with different purposes, the system can more efficiently manage preamble resources. The first part handles time delay information while the second part provides unique identification, allowing for better resource allocation and reduced collisions when supporting multiple user equipment.
Data Source
AI summary
A system and method for generating and processing preambles in wireless communication are disclosed herein. In one embodiment, the system and method are configured to receive, from a wireless communication node, a message indicating a first sequence configuration including a set of predefined parameters and a second sequence configuration including a plurality of sets of parameters; generate a first part of a random access preamble based on the set of predefined parameters; generate a second part of the random access preamble based on selecting one of the plurality of sets of parameters; and transmit the random access preamble to the wireless communication node, wherein the first part is configured to be used by the wireless communication node to locate the second part in a time domain.