Flexible Duplex DCI Signaling for TDD Spectrum Utilization
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Solution Overview
Problem
Existing New Radio (NR) systems face challenges in efficiently utilizing spectrum resources due to static duplex modes, leading to reduced resource utilization and increased delay, particularly in Time Division Duplexing (TDD) spectrum, where Half Duplex Mode causes interference and limits flexibility.
Innovation Solution
A method for determining the indication of fields in Downlink Control Information (DCI) to flexibly adjust reception and transmission, supporting flexible duplex modes like SubBand non-overlapping Full Duplex (SBFD), which allows for dynamic scheduling and improved uplink coverage and capacity.
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 reduced, but resource utilization ratio decreases and delay increases
Solution Approach 1:
The patent applies dynamics by enabling flexible switching between half-duplex and full-duplex modes in TDD spectrum. The base station can dynamically configure certain uplink symbols as downlink symbols through DCI signaling, allowing the system to adapt between interference-avoidance mode (half-duplex) and high-utilization mode (full-duplex) based on traffic conditions and interference levels.
Solution Approach 2:
The patent changes the parameter of symbol direction configuration by allowing DCI to override the default TDD UL-DL configuration. Specifically, DCI can indicate that certain symbols configured as uplink should be treated as downlink symbols, thereby changing the operational parameters of the system to achieve flexible duplexing and improve resource utilization.
2Productivity
If flexible duplex mode is supported in TDD spectrum, then resource utilization improves and delay reduces, but self-interference and cross-link interference increase
Solution Approach 1:
The patent applies local quality by enabling full-duplex operation only in specific subbands or symbol periods where interference can be managed, rather than across the entire spectrum continuously. The base station can selectively configure certain symbols as downlink while maintaining uplink in other symbols, creating localized full-duplex regions that improve utilization without overwhelming interference.
Solution Approach 2:
The patent converts the harmful interference issue into a beneficial feature by using DCI signaling to dynamically manage and coordinate uplink/downlink configurations. The interference problem is transformed into a controllable parameter through explicit signaling, allowing the system to achieve flexible duplexing while managing interference through coordinated resource allocation.
3Productivity
If DCI fields are configured for flexible duplex modes, then uplink coverage and capacity improve, but signaling overhead increases
Solution Approach 1:
The patent applies universality by designing DCI fields that serve multiple functions: they not only schedule uplink/downlink resources but also dynamically configure symbol directions and indicate flexible duplex mode operations. This multi-functionality reduces the need for separate dedicated signaling fields, thereby improving uplink capacity while minimizing signaling overhead.
Solution Approach 2:
The patent merges the function of TDD UL-DL configuration signaling with DCI scheduling fields. Instead of using separate signaling mechanisms, the patent combines the configuration of symbol directions and resource scheduling into a unified DCI structure, reducing overall signaling overhead while maintaining the ability to support flexible duplex modes and improve uplink capacity.
Data Source
AI summary
A first node receives a first DCI, the first DCI scheduling a first cell set; and receives or transmits a first radio signal in K1 cells of the first cell set; the first DCI indicates a first symbol set, the first radio signal occupying the first symbol set; a first field set in the first DCI is applied to a target cell in the first cell set; an indication of the first field set in the first DCI depends on whether the target cell is configured with at least one first-type symbol, or the indication of the first field set in the first DCI depends on whether the first symbol set comprises at least one first-type symbol; the first-type symbol includes a symbol for uplink that is configured as downlink symbol by TDD UL-DL configuration signaling. This method flexibly adjusts the indication of the field of the DCI.