Sub-Band Full-Duplex Operation for Faster CLI Measurement
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Solution Overview
Problem
Existing wireless communications systems face challenges in accommodating simultaneous uplink and downlink transmissions due to time division duplex (TDD) limitations, particularly in unpaired spectrum, leading to inefficient CLI measurement and increased signaling overhead.
Innovation Solution
Implementing sub-band based full-duplex operation by configuring a full duplex UL and DL sub-band within a carrier, allowing simultaneous reception and transmission in non-overlapping sub-bands, and enhancing CLI measurement through multiple time instances and measurement occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If time division duplex (TDD) is used to avoid interference, then interference between uplink and downlink is reduced, but uplink and downlink transmission opportunities are limited and cannot be accommodated simultaneously
Solution Approach 1:
The carrier bandwidth is divided into multiple sub-bands, with different sub-bands allocated for uplink and downlink transmissions. This segmentation allows simultaneous UL and DL operations in different frequency segments while maintaining interference avoidance through frequency separation.
Solution Approach 2:
The system transitions from time-domain separation (TDD) to frequency-domain separation (sub-band based full duplex). By introducing frequency dimension for resource allocation, the system enables simultaneous UL and DL transmissions without temporal switching, thereby increasing transmission opportunities while maintaining interference management.
2Measurement precision
If traditional CLI measurement methods are used, then interference measurement can be performed, but signaling overhead is increased and measurement speed is reduced
Solution Approach 1:
The patent extracts and utilizes existing uplink grant signaling information to configure CLI measurement resources, rather than introducing separate dedicated measurement configuration signaling. This extraction approach reduces signaling overhead while maintaining measurement capability.
Solution Approach 2:
The uplink grant signaling serves dual purposes: scheduling uplink transmissions and configuring CLI measurement resources. This multi-functionality reduces the need for separate measurement configuration signaling, thereby reducing overall signaling overhead while maintaining measurement precision.
Data Source
AI summary
Various aspects of the present disclosure relate to methods, apparatuses, and systems that support sub-band based full duplex operation. For instance, a UE is provided with resources for full-duplex UL and DL operation, and a measurement resource that includes multiple time instances for measuring interference in conjunction with full-duplex operation, e.g., CLI. The UE can perform UL transmission on the provided resources and can measure interference using the measurement resource.