Full-Duplex Base Station Bandwidth Part Configuration
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing bandwidth parts (BWPs) and resources for full-duplex communication at base stations with user equipment (UEs) operating in half-duplex mode, leading to interference issues and reduced spectral efficiency.
Innovation Solution
The system configures downlink and uplink BWPs with restricted portions or guard bands to minimize self-interference, allowing for effective communication between base stations and UEs in full-duplex mode by indicating specific resource sets for each operation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is implemented at base station, then spectral efficiency is improved, but self-interference increases
Solution Approach 1:
The patent segments the bandwidth into multiple bandwidth parts (BWPs), with specific BWPs allocated for downlink and uplink operations. By dividing the frequency spectrum into distinct segments, the base station can simultaneously perform downlink transmissions and uplink receptions in different frequency segments, thereby achieving full-duplex operation while managing self-interference through spatial and spectral separation.
Solution Approach 2:
The patent applies local quality by configuring specific BWPs with particular characteristics suitable for their intended direction (uplink or downlink). Each BWP is optimized with appropriate numerology, cyclic prefix configuration, and frequency positioning to minimize interference. The restricted portions and guard bands are locally applied at specific frequency boundaries where interference is most problematic, rather than uniformly across the entire spectrum.
2Object-generated harmful factors
If restricted portions and guard bands are configured in BWPs, then self-interference is reduced, but resource utilization decreases
Solution Approach 1:
The patent implements dynamic BWP configuration where the base station can activate or deactivate specific BWPs based on traffic conditions and interference levels. The restricted portions and guard bands are dynamically adjusted in size and position according to real-time requirements. When full-duplex operation is needed, appropriate BWPs are activated with optimized guard band configurations; when half-duplex operation suffices, fewer BWPs are activated, reducing the impact of restricted portions on overall resource utilization.
Solution Approach 2:
The patent changes key parameters such as subcarrier spacing, cyclic prefix length, and bandwidth size for different BWPs to optimize performance. By adjusting these parameters, the system can minimize the impact of guard bands and restricted portions while maintaining effective interference reduction. For example, tighter subcarrier spacing or optimized cyclic prefix configurations can reduce the relative overhead of guard bands, thereby improving resource utilization while maintaining interference protection.
3Adaptability or versatility
If base station operates in full-duplex mode with half-duplex UEs, then communication flexibility is improved, but interference management complexity increases
Solution Approach 1:
The patent creates a universal BWP configuration framework that works for both full-duplex and half-duplex operation modes. The same BWP structure, with its defined restricted portions and guard bands, can serve multiple purposes: supporting full-duplex base station operation, supporting half-duplex UEs, and facilitating mode transitions. This multi-functional approach reduces the need for separate complex interference management mechanisms for different operation modes, thereby reducing overall system complexity while maintaining flexibility.
Data Source
AI summary
The apparatus may be configured to configure a downlink BWP and an uplink BWP having at least one of a restricted uplink portion, a restricted downlink portion, or a guard band associated with one or more of the downlink BWP or the uplink BWP. The apparatus may also be configured to communicate with one or more UEs in the restricted downlink portion of the downlink BWP and the restricted uplink portion of the uplink BWP. The apparatus may be configured to transmit, to a first UE in a half-duplex mode of operation, an indication of a first set of resources for a full-duplex mode of operation of the base station and a second set of resources for the half-duplex mode of operation of the base station. The apparatus may also be configured to communicate with the first UE in the indicated first set of resources.