XDD Subband Scheduling for Half-Duplex UL-DL Collision Priority
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Solution Overview
Problem
Existing wireless communication systems face challenges in enhancing coverage and scheduling efficiency due to the need for defining and managing non-overlapping UL/DL subbands, particularly in full-duplex operations, which are not adequately addressed by legacy TDD technologies.
Innovation Solution
The proposed solution involves defining UL/DL subbands as regions of continuous resource blocks, configuring them semi-statically or dynamically in the frequency domain based on an offset relative to the associated BWP, and determining priority between UL transmission and DL reception using higher layer signaling to minimize collisions and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy TDD technology is used for slot format indication, then system compatibility is maintained, but coverage enhancement and scheduling efficiency are limited
Solution Approach 1:
The patent segments the frequency spectrum into non-overlapping UL and DL subbands, allowing independent configuration and management of uplink and downlink resources. This segmentation enables coverage enhancement through subband-specific beamforming and resource allocation while maintaining overall system compatibility with legacy TDD frameworks.
Solution Approach 2:
The patent introduces a frequency domain dimension for UL/DL separation by defining non-overlapping subbands, moving beyond the traditional time-domain only approach of legacy TDD. This dimensional expansion enables full-duplex operation and coverage enhancement while preserving backward compatibility with existing TDD slot structures.
2Productivity
If non-overlapping UL/DL subbands are defined for full-duplex operations, then scheduling efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The patent enables dynamic configuration of UL/DL subbands through higher layer signaling, allowing the network to adapt resource allocation to varying traffic conditions and channel states. This dynamic approach improves scheduling efficiency by optimizing resource utilization while the automated signaling mechanisms manage the complexity of resource allocation.
Solution Approach 2:
The patent changes the configuration parameters of UL/DL subbands including frequency offsets, bandwidths, and resource block allocations through higher layer signaling. These parameter changes enable flexible resource allocation that improves scheduling efficiency while the standardized parameter sets and signaling procedures manage the complexity of configuration management.
3Loss of time
If priority determination between UL transmission and DL reception is implemented, then collision latency is reduced, but signaling overhead increases
Solution Approach 1:
The patent establishes priority relationships between UL transmissions and DL receptions through pre-configured higher layer signaling parameters. This preliminary configuration of priority rules enables UEs to autonomously resolve collisions without real-time signaling, reducing collision latency while the standardized priority frameworks manage signaling overhead.
Solution Approach 2:
The patent enables UEs to self-determine transmission priorities based on pre-configured parameters and local decisions regarding UL/DL collisions. This self-service approach reduces collision latency by eliminating real-time network intervention while the standardized self-determination rules manage the complexity of autonomous priority resolution.
Data Source
AI summary
An apparatus and method are provided for performing a subband operation for cross division duplex (XDD) technology to enhance coverage in wireless communication systems. A method includes identifying, by a user equipment (UE), an uplink (UL) or downlink (DL) subband configuration provided from a gNB to the UE, and determining a priority between a UL transmission and a DL reception based on whether a collision between DL and UL operations occurs in a time domain, wherein the UE is a half-duplex UE which performs the UL transmission at different times than when the UE performs the DL reception.