Proactive SSB/TRS Reception for RedCap Half-Duplex FDD
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Solution Overview
Problem
Half-duplex operation in RedCap wireless devices (WDs) faces challenges in managing overlapping downlink (DL) and uplink (UL) transmissions, particularly in frequency division duplex (FDD) mode, leading to undefined WD behavior and potential signal reception failures.
Innovation Solution
Implement proactive synchronization signal and physical broadcast channel signal block (SSB)/tracking reference signal (TRS) reception procedures, where the WD determines if a first signal reception condition is met within a time interval ΔT before operating a second signal, prioritizing DL reception over UL transmission to ensure synchronization and avoid conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If half-duplex operation is implemented in RedCap wireless devices to reduce device complexity and cost, then device size and bill of material costs are reduced, but signal reception reliability deteriorates due to undefined WD behavior during overlapping DL and UL transmissions
Solution Approach 1:
The patent applies preliminary action by defining proactive SSB/TRS reception procedures that must be performed before uplink transmissions in half-duplex FDD operation. The WD is required to receive and process downlink synchronization signals and reference signals in advance of potential uplink transmission occasions, ensuring synchronization is established beforehand. This prevents conflicts between simultaneous DL reception and UL transmission by sequencing operations to prioritize DL signal acquisition first, thereby resolving the reliability issue while maintaining half-duplex simplicity
2Reliability
If proactive SSB/TRS reception procedures are implemented to ensure synchronization, then signal reception reliability is improved, but time resource utilization deteriorates due to reserved time intervals
Solution Approach 1:
The patent applies dynamics by making the time interval ΔT configurable and adaptive rather than fixed. The network can adjust the duration of the reserved time interval based on actual synchronization needs, device state, and traffic conditions. Additionally, the proactive reception procedure is dynamically triggered based on whether the WD has uplink data to transmit, allowing the system to optimize between synchronization reliability and time resource efficiency by activating the procedure only when necessary
Data Source
AI summary
A method and wireless device (WD) for proactive synchronization signal and physical broadcast channel signal block (SSB)/tracking reference signal (TRS) reception procedures for half-duplex operation are disclosed. According to one aspect, a method in a WD includes determining whether a first signal reception (FSR) condition is met, the FSR condition including one of receipt and availability of at least N first signals during a time interval ΔT ending at a time T2, N being an integer greater than zero. The method also includes, when the FSR condition is met, operating a second signal on a radio resource at the time T2.