RACH Preamble Detection Using Multiple Zero-Correlation Zones
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Solution Overview
Problem
In 3GPP LTE wireless communication systems, the existing random access channel (RACH) preamble detection based on a single zero-correlation zone limits the detection probability, making it difficult to support priority uplink synchronization acquisition for UEs, especially during urgent situations like handovers or initial access.
Innovation Solution
A method and apparatus for detecting RACH preamble using a combination of sequences corresponding to multiple zero-correlation zones (ZCZs), enhancing the detection probability by generating and transmitting RACH preambles with multiple peaks across various ZCZs, thereby improving uplink synchronization acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single zero-correlation zone is used for RACH preamble detection, then the detection process is simple, but the detection probability is limited
Solution Approach 1:
The RACH preamble detection process is segmented into multiple zero-correlation zones (ZCZs) instead of using a single ZCZ. Each ZCZ independently detects correlation peaks, and the results are combined to determine the final preamble ID. This segmentation increases detection probability by providing multiple independent detection opportunities while managing complexity through structured processing of each zone.
Solution Approach 2:
The detection approach transitions from a single-dimensional (single ZCZ) to multi-dimensional (multiple ZCZs) detection. By introducing the dimension of multiple zones, the system achieves higher detection probability through spatial diversification of detection regions, where each zone provides an additional dimension for preamble identification.
2Reliability
If multiple sequences corresponding to multiple zero-correlation zones are combined, then the detection probability increases, but the preamble structure becomes more complex
Solution Approach 1:
The preamble structure is segmented into multiple sequences, each associated with a specific zero-correlation zone. This segmentation allows the system to maintain reliability by ensuring that at least one sequence can be successfully detected, while managing structural complexity through organized assignment of sequences to specific zones with defined detection rules.
Solution Approach 2:
The system employs multiple sequences beyond what a single ZCZ would require, providing redundant detection opportunities. This partial or excessive action ensures that even if some sequences are not detected due to interference or fading, the synchronization acquisition can still succeed through other sequences in different zones.
3Productivity
If RACH preambles are transmitted with multiple peaks across various ZCZs, then the detection probability for urgent synchronization is improved, but the resource allocation becomes more complex
Solution Approach 1:
The system performs preliminary detection across multiple ZCZs simultaneously, allowing urgent synchronization requests to be identified and processed faster. By preliminarily establishing detection results in multiple zones, the system can quickly determine preamble ID without requiring sequential processing, thus improving synchronization acquisition speed while managing resource allocation through parallel detection mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the detection probability of RACH preambles for UEs needing urgent synchronization, allowing for preferential support of uplink synchronization acquisition, even in contention-based random access procedures, while maintaining efficient resource allocation.
Implementation Method 1
The RACH preamble is generated, by a user equipment (UE), using a combination of a plurality of sequences corresponding to a plurality of zero-correlation zones (ZCZ)
Data Source
AI summary
Provided are a method and an apparatus for detecting a random access channel (RACH) preamble on the basis of a plurality of zero-correlation zones (ZCZ) in a wireless communication system. A user equipment (UE) transmits a RACH preamble, generated using a combination of a plurality of sequences corresponding to a plurality of zero-correlation zones, to an evolved NodeB (eNB). The evolved NodeB (eNB) detects a plurality of peaks from the RACH preamble and transmits a random access response to the UE.