Wireless Communication Node Symbol Subset Selection for Uplink Interference
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Solution Overview
Problem
The existing NR system's half-duplex mode in TDD spectrum leads to decreased resource utilization and increased latency, while flexible duplex modes in subband nonoverlapping full duplex (SBFD) scenarios face severe interference issues such as self-interference and cross-link interference.
Innovation Solution
A unified design scheme for wireless communication nodes that involves determining symbol sets and subsets based on PDCCH monitoring and resource element assignments to optimize resource utilization and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If half-duplex mode is used in TDD spectrum, then self-interference is avoided and cross-link interference is mitigated, but resource utilization decreases and latency increases
Solution Approach 1:
The patent implements dynamic link direction configuration where the base station can flexibly switch between uplink and downlink directions on different subbands and time slots. This allows the system to transition from static half-duplex mode to dynamic flexible duplex mode, optimizing resource utilization while managing interference through adaptive beamforming and spatial isolation techniques.
Solution Approach 2:
The patent divides the frequency spectrum into multiple subbands with different link directions (uplink, downlink, or flexible). By segmenting the spectrum resources and assigning different duplex modes to different subbands, the system achieves both high resource utilization and effective interference management through spatial and spectral isolation.
2Productivity
If flexible duplex mode is implemented in SBFD scenario, then resource utilization improves and latency decreases, but self-interference and cross-link interference increase
Solution Approach 1:
The patent applies different beamforming configurations and spatial filtering techniques to different subbands and user equipment. By optimizing the local quality of signal transmission in each subband with appropriate beam directions and spatial filters, the system maximizes resource utilization while minimizing self-interference through localized spatial isolation.
Solution Approach 2:
The patent converts the harmful self-interference effect into a beneficial signal by using the known interference characteristics to pre-condition the transmission. Through techniques like interference pre-subtraction and adaptive beamforming that deliberately shape transmission beams to avoid interfering with simultaneous receptions, the system transforms potential interference into manageable signals that can be utilized for improved resource efficiency.
3Productivity
If flexible duplex mode is implemented in SBFD scenario, then resource utilization improves, but cross-link interference increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands with independently configured link directions. By assigning different duplex modes (uplink, downlink, or flexible) to different subbands, the system achieves high resource utilization while minimizing cross-link interference through spectral isolation and selective activation of flexible subbands.
Solution Approach 2:
The patent introduces guard bands and transition regions between subbands with different link directions as intermediary elements. These intermediary regions act as buffers that isolate adjacent subbands with opposite link directions, effectively reducing cross-link interference while maintaining overall system resource utilization.
Data Source
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AI summary
The present application discloses a method and apparatus for use in a wireless communication node. The method comprises: a first node receiving first signaling, the first signaling being used for determining a first symbol set, and the first symbol set comprising at least one symbol; and sending a first signal in a first symbol subset, any symbol in the first symbol subset being a symbol in the first symbol set. A first symbol is a symbol in the first symbol set, and the first symbol being a first-type symbol. Whether the first symbol belongs to the first symbol subset is related to at least one of the following: whether the first node monitors a PDCCH in the first symbol; and whether the first signal is assigned in the first symbol at least one RE belonging to a first RE set, the first RE set comprising at least one RE. This method improves the utilization rate of system resources, improves the spectrum efficiency and reliability of uplink transmission, and reduces delay.