NR-U Interlace Resource Allocation for Variable SCS
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Solution Overview
Problem
The LAA-LTE system's fixed subcarrier spacing (SCS) of 15 kHz is incompatible with the variable SCS configurations in the NR system, requiring a redesign of the interlace structure for NR-based access to unlicensed spectrum (NR-U) to meet bandwidth and power requirements.
Innovation Solution
Resource allocation in the NR-U system is facilitated by configuring different offset values for various SCSs, allowing for interlace-based allocation units and reserving physical resource blocks (PRBs) at the center position to accommodate channels like PRACH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interlace structure is redesigned for different SCS configurations in NR-U, then compatibility with variable SCS is improved, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by configuring different offset values for different subcarrier spacing (SCS) configurations. Specifically, for 15 kHz SCS, offset value 0 is used; for 30 kHz SCS, offset value 1 is used; for 60 kHz SCS, offset value 2 is used. This allows the interlace structure to adapt to different SCS configurations without requiring complete structural redesign, thereby improving compatibility while controlling complexity.
2Reliability
If PRBs are reserved at center position for continuous resource allocation, then PRACH transmission is facilitated, but bandwidth utilization efficiency decreases
Solution Approach 1:
The patent applies local quality by making different parts of the frequency spectrum serve different functions. Specifically, the center PRBs are reserved for PRACH transmission to ensure reliable random access, while the remaining non-center PRBs are allocated for data transmission. This localized functional differentiation ensures PRACH reliability while maximizing bandwidth utilization for data traffic.
Data Source
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AI summary
Embodiments of this application provide a resource allocation method, a terminal device, and a network device. The method includes: receiving, by a terminal device, first indication information sent by a network device, the first indication information being used for determining frequency domain units included in a first interlace on a first BWP; and determining, by the terminal device, the frequency domain units included in the first interlace according to the first indication information.