Subband Full-Duplex Slot Scheduling for Self-Interference Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing semi-persistent scheduling for subband full-duplex slots, leading to interference and inefficiencies in resource allocation.
Innovation Solution
The system identifies slot formats for subband full-duplex slots and employs semi-persistent scheduling configurations, allowing UEs to determine optimal scheduling occasions based on slot formats and periodicity, with mechanisms for resolving resource conflicts and overlapping resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subband full-duplex slots are configured to allow simultaneous uplink and downlink transmissions, then spectral efficiency is improved, but self-interference between uplink and downlink signals increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and assigns different subbands for uplink and downlink transmissions within the same time slot. This frequency-domain segmentation allows simultaneous bidirectional communication while reducing self-interference by spatially separating the interfering signals in the frequency spectrum.
Solution Approach 2:
The patent applies local quality by configuring specific subbands with different duplexing characteristics. Some subbands are configured for full-duplex operation while others may use traditional half-duplex or flexible duplexing modes, allowing the system to optimize performance locally in different frequency regions based on interference conditions and traffic requirements.
2Productivity
If semi-persistent scheduling is used for uplink transmissions in subband full-duplex slots, then uplink resource allocation efficiency is improved, but interference management complexity increases
Solution Approach 1:
The patent employs semi-persistent scheduling where uplink resources are pre-allocated in advance for a configured period. This preliminary action allows the UE to transmit uplink data without requiring dynamic grant signaling for each transmission, improving resource allocation efficiency. The scheduling parameters are configured beforehand, reducing the need for real-time interference coordination while maintaining efficient uplink resource utilization.
3Productivity
If downlink transmissions are configured in slots where uplink transmissions occur, then network resource utilization is improved, but uplink transmission reliability deteriorates due to self-interference
Solution Approach 1:
The patent introduces interference cancellation techniques as an intermediary mechanism to mitigate the harmful effects of self-interference. The UE receives downlink transmissions containing both desired signal and self-interference from its own uplink transmission. Through interference cancellation processing, the system removes or reduces the self-interference component, thereby preserving uplink transmission reliability while enabling simultaneous downlink resource utilization.
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AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for identification of a slot format for a set of slots where at least one slot format of the set is an subband full-duplex slot (e.g., includes uplink and downlink resources separated in a frequency domain). The base station may transmit one or more semi-persistent scheduling configurations to a UE. The UE may identify semi-persistent scheduling occasions for receiving a downlink communication based at least in part on the SPS configurations matching the format of the slot, the periodicity of the slot formats of the set, or other considerations. The UE and the base station may communicate based at least in part on the determined semi-persistent scheduling occasions.