Uplink Interlace Structure for Limited Bandwidth NR Systems
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Solution Overview
Problem
The challenge in the LAA-LTE system is determining an appropriate interlace structure for uplink transmission in the NR system, which is not supported by the limited system bandwidth, and the concept of bandwidth part (BWP) is introduced to address this, but the method of determining the interlace structure for uplink resource allocation is not applicable.
Innovation Solution
A wireless communication method where a terminal device determines a first interlace set on a carrier based on a specific frequency domain reference point, allowing for uplink transmission through frequency domain units within the determined interlace set, and a network device indicates this reference point to the terminal device for configuring the interlace structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the LAA-LTE system uses a carrier aggregation structure with licensed and unlicensed carriers, then uplink transmission capacity is improved, but the system bandwidth support is limited and cannot meet NR system requirements
Solution Approach 1:
The patent segments the unlicensed carrier bandwidth into multiple interlaces, where each interlace consists of non-consecutive physical resource blocks (PRBs). This segmentation allows the system to support larger effective bandwidths by distributing resources across the entire carrier spectrum, thereby resolving the contradiction between limited system bandwidth support and the need for higher uplink transmission capacity in NR systems.
2Adaptability or versatility
If an interlace structure with non-consecutive PRBs is used for uplink resource allocation, then resource allocation flexibility is improved, but the complexity of determining the interlace structure increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the interlace structure parameters (such as the number of interlaces, PRBs per interlace, and frequency spacing) before actual resource allocation. The network device configures these parameters in advance and notifies the terminal, which then automatically determines the interlace set based on pre-agreed rules. This eliminates the need for complex real-time calculations and reduces determination complexity while maintaining resource allocation flexibility.
3Productivity
If the signal occupies at least 80% of channel bandwidth in unlicensed spectrum, then transmission efficiency is improved, but the power spectrum density increases and may affect other signals such as radar
Solution Approach 1:
The patent applies local quality by allowing different power spectral density (PSD) levels for different interlaces within the same carrier. The network device can configure specific PSD requirements for each interlace based on local conditions, such as coexistence requirements with radar or other systems. This enables the signal to occupy the required bandwidth (improving transmission efficiency) while controlling the power spectral density in specific frequency regions to avoid harmful interference to other signals.
Data Source
AI summary
The present application provides a wireless communication method, a terminal device and a network device. The method includes: a terminal device determines a first interlace set on a first carrier according to a first frequency domain reference point, where the first interlace set includes at least one first interlace, the first interlace includes at least two frequency domain units, any two adjacent frequency domain units of the at least two frequency domain units arc non-consecutive, and a frequency domain spacing between any two adjacent frequency domain units of the at least two frequency domain units is equal; and the terminal device performs uplink transmission through frequency-domain units included in the first interlace set.