Uplink Resource Allocation in Unlicensed Bands
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Solution Overview
Problem
Resource allocation methods in unlicensed bands for 5G communication systems, particularly for NR-U, have not been comprehensively studied, leading to inefficiencies in frequency resource utilization and potential non-compliance with Power Spectral Density (PSD) regulations.
Innovation Solution
The implementation of a method that determines frequency resources for uplink transmission by associating resources between reference signals and uplink signals, enabling partial interlace allocation and frequency division multiplexing, which allows for efficient allocation of resources in unlicensed bands while ensuring compliance with PSD regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional resource allocation methods are used in unlicensed bands, then device complexity is reduced, but frequency resource utilization efficiency deteriorates and PSD compliance is compromised
Solution Approach 1:
The frequency resource is divided into multiple interlaces, each containing multiple resource blocks. The mobile station selects specific interlaces for uplink transmission based on association relationships with downlink reference signals, enabling efficient frequency resource utilization while maintaining manageable allocation complexity through structured segmentation.
Solution Approach 2:
The association relationship between downlink reference signals and uplink frequency resources serves multiple functions: it enables frequency resource allocation, ensures PSD compliance through power control, and establishes link between reference signal and data transmission resources, thereby improving productivity without proportionally increasing device complexity.
2Productivity
If frequency resources are allocated without association relationships, then device complexity is reduced, but transmission efficiency and PSD compliance deteriorate
Solution Approach 1:
The base station transmits downlink reference signals (such as PBCH or PDSCH) carrying association relationship information. The mobile station uses this feedback information to determine the frequency resources for uplink transmission, ensuring efficient resource allocation and PSD compliance while the complexity is managed through standardized feedback mechanisms.
Solution Approach 2:
The association relationships between frequency resources and reference signals are pre-configured and indicated through downlink control information before uplink transmission occurs. This preliminary action allows the mobile station to efficiently determine allocation without complex real-time calculations, improving transmission efficiency while keeping device complexity manageable.
Data Source
AI summary
Provided is a mobile station that can appropriately allocate resources in an unlicensed band. In the mobile station (200), on the basis of resource association between an uplink reference signal and another uplink signal different from the reference signal, a control unit (205) determines a frequency resource to be used for uplink transmission. A transmission unit (209) uses the frequency resource to transmit at least one of the reference signal and the other uplink signal.