NR Terminal PRACH Configuration for 52.6-71 GHz Access
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Solution Overview
Problem
There is a need for a technique that enables a terminal to appropriately configure the transmission of a random access preamble in high frequency bands higher than or equal to the FR2 frequency band for NR, particularly in the frequency range from 52.6 GHz to 71 GHz, considering the introduction of new subcarrier spacing and regulatory requirements for unlicensed frequency bands.
Innovation Solution
A terminal is equipped with a reception unit to receive configuration information for configuring the format, sequence, and subcarrier spacing of the random access preamble and uplink shared channel based on provided information, allowing it to select appropriate orthogonal sequences and subcarrier spacings for PRACH formats, including new numerologies such as 480 kHz and extended cyclic prefixes, tailored for licensed and unlicensed frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new subcarrier spacing (e.g., 480 kHz) is introduced for frequency band extension to 52.6-71 GHz, then communication capability in extended frequency range is improved, but system complexity and configuration difficulty increase
Solution Approach 1:
The patent applies universality by enabling the terminal to handle multiple subcarrier spacing configurations (120 kHz, 240 kHz, 480 kHz) within a single random access framework. The terminal can select appropriate subcarrier spacing based on frequency band conditions, making the system versatile across different frequency ranges without requiring separate dedicated systems for each band.
Solution Approach 2:
The patent implements dynamics by allowing flexible, dynamic selection of subcarrier spacing values based on the operating frequency band. The terminal can adaptively choose between 120 kHz, 240 kHz, or 480 kHz subcarrier spacing according to whether it operates in FR2 (24.25-52.6 GHz) or the extended band (52.6-71 GHz), enabling the system to optimize performance for each specific frequency range.
2Adaptability or versatility
If terminal must support multiple subcarrier spacing values (120 kHz, 240 kHz, 480 kHz) for extended frequency band, then adaptability to different frequency bands is improved, but configuration complexity and error potential increase
Solution Approach 1:
The patent applies preliminary action by pre-defining valid subcarrier spacing values (120 kHz, 240 kHz, 480 kHz) and their corresponding relationships with frequency bands. The base station provides configuration information that specifies which subcarrier spacing should be used, allowing the terminal to pre-configure itself appropriately before random access, thereby simplifying the operation despite multiple options being available.
Solution Approach 2:
The patent implements feedback through the base station's provision of configuration information that guides the terminal's subcarrier spacing selection. The base station monitors and controls the terminal's random access configuration, providing feedback in the form of configuration messages that indicate the appropriate subcarrier spacing to use, reducing configuration errors and simplifying terminal operation.
3Reliability
If random access preamble configuration is optimized for high frequency band (52.6-71 GHz), then transmission reliability in extended band is improved, but compatibility with existing FR2 configurations may be reduced
Solution Approach 1:
The patent applies segmentation by separating the random access configuration into distinct segments or modes: one for FR2 (24.25-52.6 GHz) using 120 kHz subcarrier spacing, and another for the extended band (52.6-71 GHz) using 240 kHz or 480 kHz subcarrier spacing. This segmentation allows each segment to be optimized for its specific frequency range while maintaining overall system compatibility through the unified random access framework.
Data Source
AI summary
A terminal including a reception unit that receives configuration information in a high frequency band higher than or equal to a frequency band of a frequency range 2 (FR2), the FR2 being in a range including a frequency range 1 (FR1) that is a low frequency band and the FR2 that is a high frequency band in a new radio (NR) system; and a control unit that configures at least one of a format of a random access preamble, a sequence of the random access preamble, a subcarrier spacing applied to a channel on which the random access preamble is to be transmitted, or a subcarrier spacing applied to an uplink shared channel, based on the configuration information.