Full-Duplex Capability Reporting in TDD Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently reporting and utilizing full-duplex capabilities in time division duplex (TDD) frequency bands, leading to suboptimal communication performance.
Innovation Solution
The proposed solution involves a method and system where user equipment (UE) reports its full-duplex capabilities to a network entity within a TDD frequency band, enabling concurrent transmission and reception within specific subbands, and allowing for flexible coordination of half-duplex and full-duplex operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE reports full-duplex capabilities in a TDD frequency band, then communication efficiency and resource utilization are improved, but the complexity of capability reporting and system coordination increases
Solution Approach 1:
The capability reporting is segmented into separate indication fields for first full-duplex capability (e.g., uplink transmission capability in first subband) and second full-duplex capability (e.g., downlink reception capability in second subband). This segmentation allows the network to selectively activate specific full-duplex capabilities without requiring comprehensive reporting of all possible capabilities, thereby reducing reporting complexity while maintaining communication efficiency.
Solution Approach 2:
The system dynamically switches between half-duplex and full-duplex modes based on capability indications and network configuration. The UE can indicate support for full-duplex operations, and the network can dynamically activate these capabilities in specific subbands and time periods, allowing flexible adaptation without permanent system reconfiguration, thus balancing complexity and efficiency.
2Productivity
If concurrent transmission and reception are performed in different subbands, then spectral efficiency is improved, but signal interference and self-interference management become more challenging
Solution Approach 1:
The frequency band is segmented into multiple subbands, with specific subbands allocated for uplink transmission and downlink reception during full-duplex operations. This frequency division segmentation spatially separates the transmit and receive signals in the frequency domain, enabling concurrent operations while minimizing self-interference between uplink and downlink signals.
Solution Approach 2:
Different quality requirements and interference management strategies are applied to different subbands. The network configures specific subbands for full-duplex operations with appropriate power control, resource allocation, and interference coordination parameters tailored to each subband's characteristics, optimizing performance while managing interference locally rather than applying uniform constraints across the entire band.
3Loss of time
If full-duplex mode is activated, then latency is reduced through concurrent operations, but the difficulty of synchronizing transmission and reception increases
Solution Approach 1:
Full-duplex operations are organized into periodic time periods or slots, where the UE and network entity synchronize their full-duplex transmissions and receptions according to predetermined periodic patterns. This periodic structure provides natural synchronization points and simplifies timing coordination compared to continuous aperiodic full-duplex operations, reducing synchronization complexity while maintaining low latency through regular concurrent operations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may establish a connection with a network entity for operation within a time division duplex (TDD) frequency band. The UE may transmit, to the network entity via the TDD frequency band, capability information that indicates one or more capabilities of the UE associated with operating in a full-duplex mode within the TDD frequency band. The UE may perform, with the network entity, full-duplex communications within the TDD frequency band in accordance with the one or more indicated capabilities. Performing the full-duplex communications within the TDD frequency band may include transmitting first signaling within a first subband of the TDD frequency band concurrent with receiving second signaling within a second subband of the TDD frequency band.