Scheduling Offset for Beam Squinting in UWB Systems
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently scheduling and beamforming due to beam squinting issues at high frequency bands, leading to performance losses and signal noise ratio degradation.
Innovation Solution
The introduction of a scheduling offset mechanism, where a PDCCH includes a scheduling offset parameter to allow User Equipment (UE) to adjust its beams by scheduling the PDSCH or PUSCH in specific sub-bands within a bandwidth part (BWP), providing sufficient time for beam tuning and optimizing beamforming across ultra-wide bandwidth regimes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If beamforming is applied at high frequency bands, then signal directionality is improved, but beam squinting causes signal quality degradation
Solution Approach 1:
The system performs preliminary beam tuning by scheduling PDSCH/PUSCH in specific sub-bands before the actual data transmission. This allows the UE to adjust its beamforming weights in advance for the target sub-band, ensuring the beam is properly aligned before signal transmission occurs, thereby preventing beam squinting degradation
Solution Approach 2:
The bandwidth part (BWP) is divided into multiple sub-bands, each potentially requiring different beamforming configurations. The system segments the frequency spectrum so that beamforming can be optimized independently for each sub-band, allowing precise beam alignment without the beam squinting effects that occur when a single beam configuration is used across the entire bandwidth
2Measurement precision
If scheduling flexibility is increased to accommodate beam tuning, then beamforming accuracy is improved, but system complexity increases
Solution Approach 1:
The scheduling mechanism dynamically selects which sub-band to use for beam tuning based on current channel conditions and UE capabilities. The system can adaptively adjust the beamforming configuration for different sub-bands and different UEs, providing high beamforming accuracy while maintaining manageable complexity through standardized dynamic selection procedures
Data Source
AI summary
Aspects presented herein may enhance the configuration of the scheduling offset for communication devices within a channelized frequency band. In one aspect, a UE receives a PDCCH including a scheduling offset parameter. The PDCCH schedules one of a PDSCH for reception in a first sub-band within a BWP or provides an uplink scheduling grant of a PUSCH for transmission in a second sub-band within the BWP. The UE communicates with a base station based on one of a slot for receiving the PDSCH based on the first sub-band within the BWP and the scheduling offset parameter when the PDCCH schedules the PDSCH, or a slot for transmitting the PUSCH based on the second sub-band within the BWP and the scheduling offset parameter when a PUCCH is used to schedule the PUSCH.