Subband Full Duplex Configuration for Uplink Capacity
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Solution Overview
Problem
Legacy TDD systems face challenges such as reduced UL coverage, reduced UL capacity, and increased UL latency due to limited allocation of time resources for UL communications.
Innovation Solution
The implementation of a subband full duplex (SBFD) scheme, which splits frequency resources of a time symbol and/or slot into non-overlapping DL and UL subbands, thereby increasing the allocated time and frequency resources for UL communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If legacy TDD systems allocate limited time resources for UL communications, then DL communications can maintain stable performance, but UL coverage and capacity are reduced
Solution Approach 1:
The patent divides the frequency spectrum into multiple subbands, with each subband independently configured for DL or UL transmission. This segmentation allows simultaneous UL and DL communications in different frequency portions, thereby increasing UL capacity and reducing latency without compromising DL performance.
Solution Approach 2:
The patent transitions from traditional time-division multiplexing to frequency-division approach by utilizing subband configurations. This dimensional shift from time to frequency domain enables parallel UL and DL transmissions, effectively resolving the time resource limitation and reducing UL latency.
2Productivity
If more time resources are allocated for UL communications in TDD systems, then UL capacity increases, but DL coverage and performance deteriorate
Solution Approach 1:
By segmenting the frequency spectrum into subbands, the system can allocate specific subbands for UL while preserving other subbands for DL. This enables UL capacity expansion without encroaching on DL time resources, maintaining DL performance reliability.
Solution Approach 2:
Different subbands can be configured with different transmission directions (DL or UL) based on local traffic demands. This local quality approach allows UL-capable subbands to be optimized for uplink while DL subbands maintain their performance, resolving the trade-off between UL capacity and DL reliability.
3Productivity
If simultaneous DL and UL communications are enabled in the same time slot, then resource utilization improves, but interference between DL and UL signals increases
Solution Approach 1:
The frequency spectrum is segmented into separate subbands for DL and UL transmissions within the same time slot. This segmentation physically separates the interfering signals in the frequency domain, enabling simultaneous transmissions while minimizing DL-UL interference.
Solution Approach 2:
The subband configuration acts as an intermediary mechanism that manages DL and UL transmissions. By introducing frequency-domain separation through subband allocation, the system mediates between simultaneous transmissions and interference avoidance, achieving both high resource utilization and low interference.
Data Source
AI summary
Various aspects of the present disclosure relate to: receiving a configuration message for a subband time-frequency configuration, wherein the configuration message indicates frequency domain resources and time domain resources of at least one subband; and determining a transmission direction of the at least one subband, wherein the transmission direction comprises downlink, uplink, guard-band, or a combination thereof.