Bandwidth Part Switching for Full Duplex Wireless Systems
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Solution Overview
Problem
Conventional bandwidth part switching techniques in wireless communications systems are deficient, particularly in supporting efficient operation modes like full duplex and half-duplex modes, leading to suboptimal resource utilization and communication efficiency.
Innovation Solution
The implementation of bandwidth part (BWP) switching techniques that allow user equipment (UE) and base stations to dynamically switch between active and default BWPs based on operation modes, with the UE transmitting control messages and receiving signaling to configure default BWPs for FDD or TDD modes, ensuring efficient communication by managing inactivity timers and guard bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bandwidth part switching techniques are used, then device complexity is reduced, but communication efficiency and resource utilization deteriorate
Solution Approach 1:
The patent implements dynamic BWP switching where the UE can transition between different operation modes (FDD/TDD) and corresponding BWPs based on real-time communication needs. The base station configures multiple BWPs including default BWPs for different operation modes, and the UE switches between them dynamically using inactivity timers and mode indication messages, thereby improving communication efficiency while managing complexity through structured control mechanisms
Solution Approach 2:
The patent changes operational parameters by configuring different BWPs with specific parameters for FDD and TDD modes. The base station provides control signaling that indicates default BWP configurations for different operation modes, and the UE adjusts its operational parameters (duplex mode, bandwidth, timing) by switching between configured BWPs, thus improving efficiency without requiring complete redesign of the switching mechanism
2Adaptability or versatility
If dynamic BWP switching is implemented to support multiple operation modes, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent segments the BWP configuration into distinct default BWPs for different operation modes (FDD and TDD). The base station configures separate default BWP pairs, where each default BWP is associated with a specific operation mode. This segmentation allows the UE to adapt to different modes by switching between pre-configured segments rather than managing a complex unified configuration, thereby improving adaptability while controlling complexity
Solution Approach 2:
The base station performs preliminary configuration by providing control signaling that indicates default BWPs for both FDD and TDD modes before the UE needs to switch modes. The UE receives and stores these pre-configured default BWPs, so when mode switching is needed, it can quickly transition without complex real-time calculations, thus improving adaptability while reducing the complexity of dynamic switching
3Productivity
If inactivity timers are used for BWP switching, then resource utilization improves, but loss of time increases
Solution Approach 1:
The patent employs periodic inactivity timers that are started or restarted when the UE receives downlink control information on the active BWP. When the timer expires without being restarted, it triggers a BWP switch to the default BWP. This periodic mechanism ensures that BWPs are switched back to defaults when not actively used, improving resource utilization by preventing indefinite occupation of BWPs, while the timer-based approach provides predictable and manageable switching delays
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a control message indicating a capability of the UE to operate in a full duplex mode on a single carrier in an unpaired radio frequency spectrum. The UE may receive, from the base station, control signaling indicating a default bandwidth part associated with the full duplex mode or a half-duplex mode based at least in part on the control message. The UE and the base station may communicate using an active bandwidth part. The UE and the base station may then communicate, based on an expiration of an inactivity timer associated with the active bandwidth part, using the default bandwidth part in accordance with the full duplex mode/or the half-duplex mode.