PRACH Resource Block Allocation for High Subcarrier Spacing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating resource blocks for the random access preamble (PRACH) and determining the subcarrier spacing for both PRACH and physical uplink shared channel (PUSCH) to support the new 5G NR standard, particularly when the subcarrier spacing exceeds 120 KHz.
Innovation Solution
A method for allocating resource blocks to the random access preamble based on specific formulas involving the length of the preamble, subcarrier spacing for PRACH and PUSCH, and the number of resource blocks, allowing for subcarrier spacings greater than 120 KHz, including various combinations of Δf RA and Δf with specific values for L RA and N RB RA , and using parameters α 1, α 2, and α 3 to optimize the allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the subcarrier spacing for PRACH and PUSCH is increased to support 5G NR requirements, then the communication efficiency and adaptability to new standards are improved, but the resource block allocation complexity and difficulty of determining compatible configurations increase
Solution Approach 1:
The patent applies parameter changes by systematically varying subcarrier spacing values (Δf_RA and Δf) across multiple configurations (120 KHz, 240 KHz, 480 KHz, 960 KHz) to establish compatible combinations. The invention defines specific parameter relationships through formulas involving α1, α2, and α3 that determine resource block allocations based on these subcarrier spacing parameters, enabling 5G NR compatibility while managing complexity through standardized parameter sets.
Solution Approach 2:
The patent segments the resource block allocation problem into distinct calculable components. It divides the allocation process into separate formulas for different scenarios (different L_RA values, different subcarrier spacing combinations) and breaks down the resource block calculation into modular parts (α1, α2, α3 components) that can be independently determined and combined, thereby managing the overall allocation complexity.
2Productivity
If the subcarrier spacing exceeds 120 KHz to enhance communication efficiency, then the data transmission capability is improved, but the existing resource block allocation methods become inadequate and require new allocation formulas
Solution Approach 1:
The patent extends parameter ranges by introducing higher subcarrier spacing values (240 KHz, 480 KHz, 960 KHz) beyond the traditional 120 KHz limit. It establishes new parameter relationships and formulas that accommodate these extended values, enabling enhanced communication efficiency while providing systematic methods for resource block allocation in the extended parameter space.
Solution Approach 2:
The patent introduces dynamic adaptability by creating allocation formulas that automatically adjust resource block assignments based on the selected subcarrier spacing configuration. The system dynamically selects appropriate allocation methods based on the active Δf_RA and Δf values, allowing flexible adaptation to different communication scenarios without requiring separate static allocation tables for each configuration.
Data Source
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AI summary
Systems, methods and devices for establishing combinations of PUSCH subcarrier spacing and PRACH subcarrier spacing may include a wireless communication device determining a number of resource blocks to be occupied by a random access (RA) preamble and a PRACH frequency position parameter. The wireless communication device may allocate the resource blocks to the RA preamble according to the number of resource blocks to be occupied by the RA preamble and the PRACH frequency position parameter. The wireless communication device may transmit the RA preamble to a wireless communication node according to the allocated resource blocks.