Full Duplex Carrier Spectrum Segmentation for LTE Coexistence
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Solution Overview
Problem
Current technologies lack efficient mechanisms for multiplexing between in-band full duplex capable and non-capable devices, as well as effective coexistence mechanisms between LTE and NR carriers, leading to interference issues and suboptimal performance in next-generation wireless communication systems.
Innovation Solution
A communication method is proposed that configures protected downlink and uplink portions in the carrier spectrum to minimize interference, allowing full duplex devices to operate with low power in specific portions and aligning DL/UL resources with adjacent LTE/LTE-advanced technology based UE, while also receiving backhaul control signals and performing communication with a relay using orthogonal symbols and staggered access subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex operation is configured in a carrier spectrum, then spectral efficiency and communication capacity are improved, but interference to non full-duplex devices increases
Solution Approach 1:
The carrier spectrum is segmented into protected DL portions and protected UL portions. Full duplex devices are restricted from transmitting in protected DL portions and from receiving in protected UL portions, creating isolated regions that prevent interference to non full-duplex devices while allowing full duplex operation in non-protected portions.
Solution Approach 2:
Different quality restrictions are applied to different frequency portions. Protected portions enforce strict single-direction operation (DL only or UL only), while non-protected portions allow flexible full duplex operation. This local differentiation enables coexistence by providing interference-free zones for legacy devices while maximizing capacity in other zones.
2Adaptability or versatility
If protected DL and UL portions are configured for non full-duplex devices, then coexistence is improved, but device complexity increases
Solution Approach 1:
The protected DL and UL portions are flexibly configurable per subframe, allowing the system to dynamically adapt the carrier spectrum allocation based on traffic conditions and device capabilities. This dynamic configuration enables efficient resource utilization while maintaining coexistence, as the protected portions can be adjusted rather than fixed.
Solution Approach 2:
The same carrier spectrum serves multiple functions simultaneously: it supports both full duplex and non full-duplex devices, and can flexibly switch between different DL/UL configurations. The protected portions act as universal interfaces that enable different device types to coexist on the same carrier without requiring separate frequency allocations.
3Reliability
If DL/UL resources are aligned with adjacent LTE carrier, then coexistence between LTE and NR is improved, but flexibility in resource allocation is reduced
Solution Approach 1:
The DL/UL configuration is made dynamic and flexible, allowing alignment with LTE TDD configurations when needed for coexistence, while also enabling independent NR-specific configurations when flexibility is required. The protected portions can be configured per subframe to match LTE patterns or diverge from them based on service requirements.
Data Source
AI summary
The disclosure of the present invention proposes a communication method. The method may be performed by a wireless device and comprise: if a full duplex of a downlink (DL) reception and an uplink (UL) transmission is configured in an uplink carrier spectrum including a DL portion and a UL portion, considering that the DL portion in the uplink carrier spectrum is configured as protected DL portion for another device configured with non full-duplex. Here, the protected DL portion may allow the device configured with a non full-duplex to perform a UL transmission in the protected DL portion at a low power. The DL portion and the UL portion may be flexibly configured in the uplink carrier spectrum.