UE Full-Duplex Control via Dynamic Uplink Skipping
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Solution Overview
Problem
In wireless communication systems, enabling full-duplex mode can lead to self-interference issues due to concurrent transmission and reception, making it challenging to select optimal transmit and receive beams and limiting maximum transmit power, and existing switching mechanisms lack clarity on handling skipped uplink transmissions that overlap with downlink transmissions.
Innovation Solution
A UE is equipped with a timer-based mechanism to control switching between full-duplex and half-duplex modes, allowing it to skip uplink transmissions that would result in full-duplex operations, and perform mode-dependent control operations such as selecting optimal beams and configuring channel state feedback reports to mitigate self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is enabled for simultaneous transmission and reception, then spectral efficiency and throughput are improved, but self-interference increases and complicates beam selection
Solution Approach 1:
The patent implements dynamic switching between full-duplex and half-duplex modes based on real-time conditions. A timer mechanism dynamically controls the duplex mode: when an uplink grant is received before timer expiration, the mode switches to half-duplex; otherwise, full-duplex mode is maintained. This dynamic adaptation allows the system to optimize spectral efficiency while managing self-interference levels.
Solution Approach 2:
The patent changes the operational parameter of duplex mode between two states (full-duplex and half-duplex) based on scheduling conditions. This parameter change enables the system to adapt to varying traffic conditions and interference levels, resolving the contradiction between maintaining high spectral efficiency and controlling self-interference.
2Productivity
If full-duplex mode is enabled, then resource utilization efficiency increases, but device complexity increases due to self-interference mitigation requirements
Solution Approach 1:
The patent employs a dynamic timer-based mechanism to control full-duplex operation. The timer is started or restarted upon receiving certain indications, and its expiration determines the transition to half-duplex mode. This dynamic control simplifies the management of self-interference mitigation by providing clear, automated rules for mode switching based on uplink grant timing relative to timer expiration.
Solution Approach 2:
The system uses autonomous timer-based control to manage duplex mode transitions without requiring complex external coordination. The UE itself determines when to switch modes based on local timing information and received grants, reducing the overall system complexity while maintaining efficient resource utilization.
3Object-generated harmful factors
If uplink transmission is skipped to avoid full-duplex operation, then self-interference is reduced, but timer control behavior becomes ambiguous
Solution Approach 1:
The patent implements explicit feedback rules for timer control based on uplink grant reception. When an uplink grant is received before timer expiration, the system provides feedback by switching to half-duplex mode and stopping the timer. This clear feedback mechanism eliminates ambiguity in timer control behavior, ensuring deterministic operation even when uplink transmissions are skipped.
Solution Approach 2:
The timer control mechanism dynamically responds to uplink grant timing. The system adapts the timer state (running, expired, stopped) based on whether grants are received before expiration, providing clear operational rules that resolve the ambiguity in timer control when uplink transmissions are skipped.
Data Source
AI summary
In a wireless network, a user equipment (UE) may skip an uplink transmission associated with a dynamic uplink grant. In such cases, when the UE skips an uplink transmission that would have been concurrent with a downlink transmission, the UE may perform one or more mode-dependent control operations. For example, because the uplink transmission would result in a full-duplex operation if the UE were to perform the uplink transmission, the UE may reset a timer associated with switching from a full-duplex mode to a half-duplex mode and/or perform one or more mode-dependent control operations in the full-duplex mode. Alternatively, because the UE refrains from performing the uplink transmission that would have resulted in a full-duplex operation, the UE may maintain the timer associated with switching from the full-duplex mode to the half-duplex mode and/or perform the one or more mode-dependent control operations in the half-duplex mode.