5G NR Sub-Band Full Duplex for Low-Latency Uplink Scheduling
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Solution Overview
Problem
Conventional duplex operations in 5G NR, including Time Division Duplex (TDD) and Frequency Division Duplex (FDD), face challenges in meeting latency and spectrum resource efficiency, particularly in uplink (UL) coverage and latency, with the need for simultaneous downlink (DL) and UL transmission not adequately addressed.
Innovation Solution
Implementing Sub-band Full Duplex (SBFD) in 5G NR, allowing simultaneous DL and UL transmission in non-overlapping sub-bands, with a UE performing DL or UL operations based on specific resource indications and rules to manage time domain conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDD is used for duplex operation, then flexibility in resource allocation is improved, but uplink latency increases and coverage is reduced
Solution Approach 1:
The patent segments the frequency band into multiple sub-bands, allowing different sub-bands to be used for different purposes (downlink, uplink, or flexible) simultaneously. This segmentation enables the system to maintain TDD flexibility while reducing uplink latency by having dedicated uplink sub-bands available without waiting for time-domain uplink slots.
Solution Approach 2:
The patent transitions from time-domain division (TDD) to frequency-domain division by introducing sub-band full duplex operation. Instead of allocating uplink resources in the time dimension, the system allocates them in the frequency dimension, allowing simultaneous uplink and downlink operations in different sub-bands, thereby reducing latency.
2Loss of time
If FDD is used for duplex operation, then simultaneous transmission and reception are enabled, but spectrum resource efficiency deteriorates due to frequency gap
Solution Approach 1:
The patent applies local quality by allowing different sub-bands to have different functional assignments (downlink, uplink, or flexible) within the same carrier. This enables simultaneous transmission and reception in specific sub-bands while maintaining efficient spectrum utilization by avoiding the need for a system-wide frequency gap.
Solution Approach 2:
By segmenting the frequency band into sub-bands, the patent allows simultaneous uplink and downlink operations in non-adjacent sub-bands while keeping adjacent sub-bands available for flexible use, thereby eliminating the need for a continuous frequency gap and improving spectrum efficiency.
3Productivity
If Sub-band Full Duplex is implemented, then uplink latency is reduced and spectrum utilization is improved, but device complexity increases due to time domain conflict management
Solution Approach 1:
The patent introduces dynamic sub-band full duplex operation where the functional assignment of sub-bands can be dynamically adjusted based on traffic conditions and requirements. This dynamic approach allows the system to optimize spectrum utilization while managing device complexity through flexible, condition-based resource allocation rather than static configurations.
Solution Approach 2:
The patent changes the operational parameters by allowing sub-bands to switch between different functional states (downlink, uplink, flexible) based on scheduling decisions. This parameter change enables improved spectrum utilization while the complexity is managed through standardized state transitions and scheduling mechanisms.
Data Source
AI summary
An aspect of the disclosure includes a method for, including: receiving at least one indication indicating at least one of a DL reception and a UL transmission; and performing the DL reception through a first resource or the UL transmission through a second resource according to a rule.