PDCCH Adaptation of Semi-Persistent Uplink Resources
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Solution Overview
Problem
The high energy consumption by gNBs in receiving periodic or semi-persistent uplink transmissions, such as sounding reference signals (SRS), channel state information (CSI) reports, and scheduling requests (SR), due to the need for frequent reconfigurations via UE-specific RRC signaling, poses a significant challenge for network energy savings in 5G wireless communication systems.
Innovation Solution
Implementing mechanisms for dynamic adaptation of periodic or semi-persistent SRS, CSI reports, and physical layer resources for SR by utilizing cell-specific or group-common physical downlink control channels (PDCCH) with adaptation information, allowing gNBs to adjust resource availability and configurations more efficiently without frequent reconfigurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequent reconfigurations via UE-specific RRC signaling are used to adjust periodic or semi-persistent uplink transmissions, then resource availability and configurations can be adapted to different conditions, but energy consumption at gNBs increases significantly
Solution Approach 1:
The patent implements dynamic adaptation of periodic or semi-persistent uplink transmissions by introducing a mechanism where the gNB can send activation/deactivation commands and parameter adjustments via PDCCH (Physical Downlink Control Channel) instead of requiring frequent RRC reconfigurations. This allows the system to dynamically respond to changing channel conditions and traffic demands while keeping the gNB in a lower power state between updates.
Solution Approach 2:
The patent utilizes periodic or semi-persistent configurations for uplink transmissions (such as SRS, CSI reports, and SR) where resources are allocated for a predetermined period. During this period, the gNB can operate with stable configurations, reducing the frequency of reconfigurations and associated energy consumption. The periodic nature allows the system to balance adaptability with energy efficiency.
2Productivity
If frequent reconfigurations are performed to maintain optimal resource allocation, then resource allocation efficiency improves, but the complexity of signaling and processing increases
Solution Approach 1:
The patent segments the configuration management into two parts: semi-static configuration via RRC signaling (which establishes the baseline resource allocation) and dynamic activation/deactivation via PDCCH (which adjusts resource usage based on current needs). This segmentation reduces signaling complexity by separating long-term configuration from short-term adjustments, maintaining resource allocation efficiency without requiring frequent full reconfigurations.
3Reliability
If periodic or semi-persistent uplink transmissions are maintained continuously, then resource availability for uplink transmissions is ensured, but energy consumption at gNBs increases
Solution Approach 1:
The patent implements a mechanism where the gNB can autonomously activate or deactivate periodic/semi-persistent uplink transmissions based on current network conditions and traffic demands, without requiring continuous higher-layer signaling. The gNB uses PDCCH to send activation/deactivation commands, allowing it to self-regulate resource allocation and enter lower power states when full resource availability is not needed, thus reducing energy consumption while maintaining reliability when required.
Data Source
AI summary
Apparatuses and methods for dynamic adaptation on periodic or semi-persistent uplink transmissions are provided. A method of user equipment (UE) in a wireless communication system includes receiving a set of configurations from a higher layer, identifying, from the set of configurations, a first set of configurations indicating resources for a periodic or semi-persistent uplink transmission, and identifying, from the set of configurations, a second set of configurations for a physical downlink control channel (PDCCH) including a downlink control information (DCI) format, wherein the DCI format includes adaptation information. The method further includes performing the periodic or semi-persistent uplink transmission based on the first set of configurations, receiving the PDCCH including the DCI format based on the second set of configurations, identifying, based on the adaptation information, a third set of configurations indicating the resources for the periodic or semi-persistent uplink transmission, and performing the periodic or semi-persistent uplink transmission based on the third set of configurations.