SBFD Subband Scheduling With Frequency Offsets for Low-Interference Uplink
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving latency and coverage enhancement for subband non-overlapping full duplex (SBFD) due to overlapping frequency bands for uplink and downlink transmissions, leading to interference and reduced efficiency.
Innovation Solution
A wireless transmit/receive unit (WTRU) receives configuration information for SBFD, determining frequency resources and scheduling for uplink and downlink transmissions, and applies frequency offsets to manage orthogonal frequency division multiplexing symbols, enabling separate frequency resources for SBFD and non-SBFD slots to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If overlapping frequency bands are used for uplink and downlink transmissions in SBFD, then spectral efficiency is improved, but interference increases and transmission reliability deteriorates
Solution Approach 1:
The frequency band is segmented into multiple subbands, with specific subbands allocated for uplink transmission and others for downlink reception within the same time slot. This segmentation allows simultaneous full-duplex operation while isolating interference between directions, resolving the contradiction between spectral efficiency and transmission reliability
Solution Approach 2:
Different frequency subbands are assigned different transmission qualities and characteristics. Uplink subbands are optimized for transmission while downlink subbands are optimized for reception, allowing each to operate at optimal performance levels without mutual interference, thus maintaining both high spectral efficiency and transmission reliability
2Loss of time
If frequency resources are allocated for both uplink and downlink in the same slot, then latency is reduced, but interference management complexity increases
Solution Approach 1:
The system dynamically configures subband assignments and frequency offsets based on traffic conditions and interference levels. This dynamic adaptation allows the network to optimize latency performance while managing interference complexity through flexible, condition-based resource allocation rather than static configurations
Solution Approach 2:
Frequency offset parameters act as intermediaries between uplink and downlink resource allocations. By introducing configurable frequency offsets, the system can separate overlapping frequency resources and manage interference without requiring complex real-time coordination, thus reducing latency while controlling management complexity
3Productivity
If the same frequency resource is used for both uplink and downlink, then resource utilization is improved, but coverage is reduced due to interference
Solution Approach 1:
The system transitions from time-domain separation to frequency-domain separation by introducing subband division and frequency offset mechanisms. This dimensional change allows simultaneous uplink and downlink transmission in the same time slot with improved resource utilization, while the frequency separation maintains coverage by reducing interference effects
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may receive subband non-overlapping full duplex (SBFD) configuration information. The SBFD configuration information may be associated with subbands for uplink transmission and subbands for downlink reception. The WTRU may receive scheduling information associated with physical uplink shared channel (PUSCH) transmissions. The scheduling information may comprise a first frequency domain resource allocation (FDRA). The WTRU may transmit a first PUSCH transmission using a first frequency resource. The WTRU may determine that at least a second PUSCH transmission is to be sent using at least one OFDM symbol. The WTRU may determine that the first frequency resource overlaps. The WTRU may receive one or more of a second FDRA or a frequency offset for the second PUSCH transmission. The WTRU may determine a second frequency resource for transmitting the second PUSCH transmission. The WTRU may transmit the second PUSCH transmission using the second frequency resource.