Full-Duplex Downlink Subband Scheduling Around Uplink Interference
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Solution Overview
Problem
In full duplex wireless communication systems, simultaneous downlink and uplink transmissions on the same carrier cause self-interference, particularly on user equipment (UE) due to limited space and complex transceiver capabilities, which hampers efficient resource utilization for downlink shared channel (PDSCH) transmissions.
Innovation Solution
The system configures separate subbands for downlink shared channel (PDSCH) rate matching and uplink transmissions, using radio resource control (RRC) signaling and downlink control information (DCI) to dynamically manage active subbands, allowing for rate matching around uplink subbands and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate subbands are configured for PDSCH rate matching and UL transmissions using RRC signaling and DCI, then resource utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides the frequency spectrum into separate subbands, with specific subbands configured for PDSCH rate matching and other subbands for UL transmissions. This segmentation allows independent management of downlink and uplink resources, improving resource utilization efficiency while isolating the complexity of full duplex operations to specific frequency portions rather than the entire spectrum.
2Object-affected harmful factors
If rate matching is performed around uplink subbands, then self-interference is reduced, but processing complexity increases
Solution Approach 1:
The patent performs rate matching around uplink subbands before actual PDSCH transmission occurs. By pre-configuring which subbands are allocated for UL transmissions via RRC signaling and indicating active subbands through DCI, the system prepares the resource allocation in advance, allowing the receiver to pre-process interference patterns and reduce self-interference impact before the actual data transmission takes place.
3Adaptability or versatility
If dynamic subband activation is implemented using DCI, then adaptability is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements dynamic subband activation where only the necessary subbands are activated for PDSCH rate matching based on current traffic conditions. The DCI indicates which specific subbands are active, allowing the system to apply rate matching only where needed rather than across the entire bandwidth. This partial application of rate matching reduces the control signaling overhead compared to a blanket approach while maintaining the adaptability to dynamically adjust resource allocation.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for downlink (DL) transmission in a full duplex (FD) system. According to some embodiments of the present disclosure, a user equipment (UE) may include: a transceiver configured to receive configuration information which configures at least one subband; and a processor coupled to the transceiver and configured to determine, based on an indication, an active subband from the at least one subband for physical downlink shared channel (PDSCH) rate match or for uplink (UL) transmission or that none of the at least one subband is activated for PDSCH rate match.