PRACH-PUSCH Resource Block Mapping for High-Frequency Uplink
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Solution Overview
Problem
Existing mobile communication systems face challenges in accommodating explosive data traffic, high transmission rates, and low latency while efficiently utilizing resources, particularly in high frequency bands, such as 52.6 GHz, for physical random access channels (PRACH) and physical uplink shared channels (PUSCH).
Innovation Solution
A method and apparatus for configuring PRACH and PUSCH in high frequency bands by determining the number of resource blocks based on subcarrier spacing and sequence length, minimizing latency and preventing resource waste through optimized mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of resource blocks for PRACH is increased to accommodate the PRACH sequence in high frequency bands, then the PRACH can be successfully transmitted, but resource waste occurs due to excessive resource allocation
Solution Approach 1:
The patent changes the parameter of resource block determination from fixed allocation to dynamic calculation based on PRACH sequence length and subcarrier spacing. The number of RBs is calculated as ceil(L/(12*Δf_PRACH/Δf_PUSCH)), where L is the PRACH sequence length, ensuring optimal resource utilization without waste or insufficiency.
2Loss of substance
If the number of resource blocks for PRACH is decreased to prevent resource waste, then resource efficiency is improved, but the PRACH sequence cannot be properly mapped
Solution Approach 1:
The patent dynamically adjusts the number of resource blocks based on the PRACH sequence length L and subcarrier spacing ratio. By calculating RBs = ceil(L/(12*Δf_PRACH/Δf_PUSCH)), the system ensures that enough RBs are allocated to accommodate the sequence while minimizing resource waste, resolving the contradiction between efficiency and reliability.
3Device complexity
If PRACH and PUSCH are transmitted with the same subcarrier spacing configuration, then configuration simplicity is maintained, but latency increases in high frequency bands
Solution Approach 1:
The patent introduces dynamic subcarrier spacing configuration where Δf_PRACH can be different from Δf_PUSCH. The system selects appropriate SCS values from standardized sets (15, 30, 60, 120, 240 kHz) based on frequency band and service requirements, allowing optimized latency performance while maintaining manageable configuration complexity through standardized parameter sets.
Data Source
AI summary
Disclosed are a method and device for transmitting and receiving a wireless signal in a wireless communication system. A method for transmitting a physical random access channel (PRACH) according to an embodiment disclosed herein comprises the steps of: receiving configuration information related to uplink transmission from a base station; and transmitting the PRSCH to the base station on the basis of the configuration information. The configuration information includes information about the subcarrier spacing (SCS) of the PRACH and information about the SCS of a physical uplink shared channel (PUSCH), and the number of resource blocks (RBs) occupied by the PUSCH can be determined, on the basis of i) the SCS of the PRACH, ii) the SCS of the PUSCH, and iii) the length of the PRACH sequence, as the minimum number of RBs to which a PRACH sequence can be mapped, wherein the number of RBs occupied by the PUSCH is expressed as the number of RBs for the PUSCH.