Wireless Communication Node for Dynamic TDD Duplex Selection
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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 due to self-interference and cross-link interference, necessitating a flexible duplex mode to improve efficiency.
Innovation Solution
A method and apparatus for wireless communication that determines whether to send or abandon signals based on identity associations in specific time-frequency resource groups, using serving cell configuration information to manage duplex modes and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If half-duplex mode is used in TDD spectrum, then self-interference and cross-link interference are avoided, but resource utilization rate decreases and latency increases
Solution Approach 1:
The patent implements dynamic duplex mode selection where the base station can flexibly switch between half-duplex and full-duplex modes based on traffic conditions and interference levels. This is achieved through dynamic configuration of uplink-downlink slot patterns and subband assignments, allowing the system to adapt resource allocation in real-time to optimize both interference management and resource utilization.
Solution Approach 2:
The patent divides the frequency spectrum into multiple subbands and allows different duplex modes to be applied to different subbands simultaneously. This segmentation enables subband full-duplex operation where some subbands operate in full-duplex mode while others operate in half-duplex mode, thereby resolving the contradiction by allowing simultaneous interference avoidance in certain bands and high resource utilization in others.
2Productivity
If flexible duplex mode is supported, then resource utilization improves, but self-interference and cross-link interference increase
Solution Approach 1:
The patent applies different quality characteristics to different frequency subbands by configuring specific cancellation parameters for each subband. This includes applying different interference cancellation algorithms, different power control parameters, and different resource allocation strategies to subbands experiencing different levels of self-interference, thereby managing interference locally rather than globally.
Solution Approach 2:
The patent introduces interference cancellation mechanisms as intermediary processes between the transmitting and receiving signals. This includes implementing self-interference cancellation (SIC) techniques where the base station estimates and subtracts its own transmitted signal from the received signal, and cross-link interference cancellation where interference from opposite-direction transmissions is estimated and removed, thereby mediating the harmful interference effects.
3Productivity
If flexible duplex mode is supported, then resource utilization improves, but latency increases
Solution Approach 1:
The patent implements preliminary interference cancellation and signal processing in advance of actual data transmission. This includes pre-estimating interference components, pre-configuring resource allocations to minimize conflicts, and pre-synchronizing uplink-downlink timing relationships. By performing these actions in advance, the system can achieve high resource utilization without incurring additional latency during the actual data transmission phase.
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 a target information set; and sending a first signal in a first time-frequency resource group, or abandoning sending a first signal in a first time-frequency resource group. First serving cell configuration information is used for determining a first BWP, and the first serving cell configuration information is used for indicating a first identity and a second identity. The target information set is used for determining a reference time-frequency resource set, the reference time-frequency resource set belongs to the first BWP in a frequency domain, and the first time-frequency resource group belongs to the reference time-frequency resource set. The first signal is associated with at least one of the first identity or the second identity, and whether the first signal is sent in the first time-frequency resource group at least depends on an identity associated with the first signal.