5G Random Access Preamble Generation for Phase Noise Resistance
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Solution Overview
Problem
The existing LTE random access preamble format is inadequate for high frequency band multi-beam operations in 5G communication systems, leading to increased collision probability and poor system performance due to frequency deviation caused by phase noise.
Innovation Solution
A method and device for generating a random access preamble that includes receiving random access configuration information, generating multiple sequences based on available base sequences, and forming a preamble by adding a cyclic prefix and guard time, while also considering cyclic shifts and orthogonal codes to improve flexibility and resistance to phase noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing LTE random access preamble format is used for high frequency band multi-beam operations in 5G, then the system can maintain compatibility with legacy protocols, but the collision probability increases and system performance deteriorates due to frequency deviation caused by phase noise
Solution Approach 1:
The patent changes the physical parameters of the random access preamble by introducing a new format with extended cyclic prefix length and modified sequence structure. This allows the preamble to withstand frequency deviations caused by phase noise in high frequency bands, thereby reducing collision probability and improving random access reliability without maintaining legacy LTE format compatibility
Solution Approach 2:
The patent segments the random access preamble into distinct functional parts with different properties: a first sequence portion and a second sequence portion with different cyclic shift relationships. This segmentation allows each part to be optimized for different purposes - one for correlation detection and another for collision resolution - thereby improving overall system performance while addressing the phase noise issue
2Quantity of substance
If multiple sequences are generated from a single base sequence using cyclic shifts, then the number of available preambles increases, but the complexity of sequence generation and collision management increases
Solution Approach 1:
The patent makes a single base sequence serve multiple functions by generating multiple preamble sequences through cyclic shifts. The same base sequence can produce numerous unique preambles that can be assigned to different user equipments, thereby increasing the number of available preambles without requiring proportionally more base sequences, thus reducing overall system complexity
Solution Approach 2:
The patent performs preliminary generation of multiple sequences from each base sequence before the actual random access procedure. These pre-generated sequences with known cyclic shift relationships are stored and can be quickly referenced during random access, avoiding the need for complex real-time generation and simplifying collision management at the time of access
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present application discloses a method for generating a random access preamble, comprising the following steps of: receiving random access configuration information, the random access configuration information comprising preamble resource pool information, the preamble resource pool information comprising available base sequences; generating M sequences according to a base sequence, the M being greater than 1; and, generating a random access preamble according to the M sequences. The present application further discloses a device for generating a random access preamble, and a method and device for indicating random access configuration information. With the technical solutions disclosed by the present application, high frequency band multi-beam operations in 5G can be adapted, and the performance of the system in the random access process can be improved.