Wireless Node Time-Domain Allocation for Flexible TDD Duplex
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Solution Overview
Problem
The existing NR system's half-duplex mode in TDD spectrum leads to reduced 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 for determining time domain resources by using signaling to define reference time domain resource sets and time windows based on the type of physical channels, allowing for flexible duplex operations in wireless communication systems.
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 channel conditions and traffic requirements. This is achieved through dynamic indication of time domain resource allocation, allowing the system to adapt resource allocation patterns in real-time, thereby improving resource utilization while managing interference through conditional mode selection rather than static half-duplex operation
Solution Approach 2:
The patent changes the operational parameters of the TDD system by introducing flexible duplex modes that allow simultaneous uplink and downlink transmissions in different time slots or frequency resources. By modifying the time domain resource allocation parameters and introducing full-duplex capability indicators, the system transforms from rigid half-duplex operation to adaptable flexible duplex operation, resolving the contradiction between interference avoidance and resource utilization
2Reliability
If half-duplex mode is used in TDD spectrum, then self-interference and cross-link interference are avoided, but latency increases
Solution Approach 1:
The patent implements dynamic resource allocation that can quickly switch between transmission modes based on traffic demands. By using dynamic indication of time domain resource allocation patterns and flexible duplex mode selection, the system reduces waiting time for resource allocation and enables faster data transmission when conditions permit, thereby reducing latency while maintaining interference avoidance through adaptive mode selection
Solution Approach 2:
The patent enables continuous transmission opportunities by introducing flexible duplex modes that allow overlapping or adjacent uplink and downlink transmissions. This eliminates idle time slots required in strict half-duplex modes, maintaining continuous useful transmission actions and reducing overall latency while managing interference through spatial, temporal, or frequency separation of simultaneous transmissions
3Productivity
If flexible duplex mode is supported, then resource utilization improves, but self-interference and cross-link interference occur
Solution Approach 1:
The patent applies local quality by implementing interference management specific to each transmission scenario. Different interference mitigation techniques are applied based on the local conditions: self-interference cancellation for full-duplex transmissions, cross-link interference coordination for adjacent cell transmissions, and selective half-duplex mode for interference-prone scenarios. This localized approach allows flexible duplex operation to proceed while managing interference in specific areas where it occurs
Solution Approach 2:
The patent introduces intermediary mechanisms such as interference coordination signaling between base stations and interference cancellation processing at the receiver. These intermediaries mediate the interference effects by detecting, coordinating, and canceling self-interference and cross-link interference, enabling flexible duplex mode operation to achieve improved resource utilization while the intermediaries handle the harmful interference effects
4Productivity
If flexible duplex mode is supported, then resource utilization improves, but device complexity increases
Solution Approach 1:
The patent implements a universal resource allocation framework that handles multiple duplex modes (half-duplex, full-duplex, flexible duplex) through a unified indication mechanism. The same time domain resource allocation signaling structure is used across all modes, and the base station and user equipment are designed to interpret and execute allocations regardless of the specific duplex mode, thereby reducing device complexity through multi-functional design rather than separate handling for each mode
Data Source
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AI summary
The present application discloses a method and device used in a node for wireless communication. A first node receives a first information block, receives first signaling, and sends a first bit block in a first time window, or foregoes sending the first bit block in the first time window. The first information block is used for determining a reference time domain resource set, the first signaling is used for determining the first time window, and the first time window belongs to the reference time domain resource set; whether the first bit block is sent in the first time window depends on the type of a physical channel carrying the first bit block; when the type of the physical channel carrying the first bit block is a first type, the first bit block is sent in the first time window; and when the type of the physical channel carrying the first bit block is a second type, the sending of the first bit block is foregone in the first time window.