5G Random Access Preamble Frequency Offset Determination
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Solution Overview
Problem
The existing 5G technologies face challenges in adjusting the frequency-domain position of the preamble to accommodate various combinations of uplink (UL) shared channel subcarrier spacing and random access channel subcarrier spacing.
Innovation Solution
A method is provided to determine a frequency-domain offset parameter of a preamble in a random access channel, which involves obtaining the random access channel subcarrier spacing, preamble length, and UL channel subcarrier spacing from a base station, and calculating the frequency-domain offset parameter using specific equations or lookup tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing 5G technologies use fixed frequency-domain position parameters for preambles, then the implementation is simple, but it cannot accommodate various combinations of UL shared channel subcarrier spacing and random access channel subcarrier spacing
Solution Approach 1:
The patent changes the frequency-domain position parameter of the preamble from a fixed value to a dynamically determined value based on the subcarrier spacing combination. Specifically, the frequency-domain position is adjusted according to the ratio between UL shared channel subcarrier spacing and random access channel subcarrier spacing, enabling adaptation to various spacing combinations while maintaining proper signal alignment and guard band configuration.
2Reliability
If the frequency-domain position of the preamble is adjusted to match various subcarrier spacing combinations, then compatibility is improved, but the complexity of determining the correct position increases
Solution Approach 1:
The patent establishes a systematic method to determine the frequency-domain offset parameter based on the ratio of UL shared channel subcarrier spacing to random access channel subcarrier spacing. This parameter change approach ensures that the preamble is positioned at the correct frequency-domain location for each spacing combination, maintaining reliability of the random access process while providing a clear determination rule.
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of determining a frequency-domain offset parameter of a preamble in a random access channel and a corresponding user equipment (UE) is provided. The method includes obtaining a random access channel subcarrier spacing (Formule I) a preamble length (Formule II) and a uplink (UL) channel subcarrier spacing Δf from a base station and determining a frequency-domain offset parameter (Formule III) of a preamble in a random access channel based on the obtained random access channel subcarrier spacing (Formule IV) preamble length (Formule V) and UL channel subcarrier spacing Δf. Other embodiments of the disclosure further provide a random access method, a method for configuring random access information and related device, and a corresponding computer readable medium. The method includes receiving, from a base station, first information related to a length of a random access preamble and a first subcarrier spacing of a random access channel; receiving, from the base station, second information related to a second subcarrier spacing of a physical uplink shared channel (PUSCH); identifying an offset parameter based on the length of the random access preamble, the first subcarrier spacing, and the second subcarrier spacing, the offset parameter being used to identify a frequency resource of the random access channel; and transmitting the random access preamble based on the offset parameter.