Aperiodic TRS Offset Configuration for Secondary Cell Activation
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Solution Overview
Problem
Current communication technologies, specifically in new radio access (NR), only support periodic Channel State Information-Reference Signals (CSI-RS) for time-frequency tracking, limiting the ability to accelerate secondary cell activation, as aperiodic CSI-RS configurations for this purpose are not adequately addressed.
Innovation Solution
The method involves determining and configuring aperiodic CSI-RS resources and offsets for transmitting Tracking Reference Signals (TRS) between specific slots, allowing for flexible timing and enabling aperiodic TRS support for secondary cell activation, distinct from CSI-RS configurations for other purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only periodic CSI-RS is used for time-frequency tracking, then the system maintains simplicity in configuration and management, but the ability to accelerate secondary cell activation is limited
Solution Approach 1:
The patent introduces dynamic TRS transmission by supporting both periodic and aperiodic CSI-RS configurations. The network can flexibly switch between periodic and aperiodic TRS based on channel conditions and activation requirements, enabling accelerated secondary cell activation while maintaining system adaptability.
Solution Approach 2:
The patent changes the transmission parameter of CSI-RS from strictly periodic to including aperiodic modes. By introducing different periodicity values (including aperiodic transmission), the system can optimize TRS transmission for secondary cell activation scenarios, improving activation speed without sacrificing configuration flexibility.
2Loss of time
If aperiodic TRS is introduced to accelerate secondary cell activation, then activation speed improves, but configuration complexity increases
Solution Approach 1:
The patent makes the CSI-RS configuration multi-functional by supporting both periodic and aperiodic transmission modes within the same framework. The same CSI-RS resource configuration can serve both regular time-frequency tracking (periodic) and accelerated activation (aperiodic), reducing overall system complexity while enabling fast activation.
Solution Approach 2:
The patent pre-configures aperiodic TRS resources and parameters in advance, so that when secondary cell activation is needed, the network can immediately trigger aperiodic TRS transmission without complex real-time negotiations. This preliminary configuration reduces activation time while keeping the complexity managed through standardized parameter sets.
3Measurement precision
If separate offset configurations are used for TRS and CSI-RS, then transmission timing precision improves, but signaling overhead increases
Solution Approach 1:
The patent applies different offset configuration strategies to different scenarios: for periodic TRS, a fixed offset pattern is used; for aperiodic TRS, flexible offset parameters are configured. This localized optimization provides precise timing control where needed while avoiding unnecessary signaling overhead in routine periodic operations.
Solution Approach 2:
The patent configures timing offsets with appropriate precision for each scenario - full precision for aperiodic TRS where timing is critical for activation, and reduced precision for periodic TRS where regular patterns suffice. This partial application of precise offset configuration reduces overall signaling overhead while maintaining necessary timing accuracy.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for Reference Signal (RS) transmission. In example embodiments, a method implemented in a network device is provided. According to the method, the network device determines at least one set of CSI-RS resources for transmitting Tracking Reference Signal (TRS) to a terminal device. The network device further determines a first offset between a first slot to transmit a first signal for enabling transmission of the TRS and a second slot to transmit the TRS in the at least one set of CSI-RS resources. The first offset is different from a second offset between a third slot to transmit a second signal for enabling transmission of CSI-RS and a fourth slot to transmit the CSI-RS. The network device transmits a configuration indicating the at least one set of CSI-RS resources and the first offset to the terminal device.