RRC State Management for Wireless Data Transmission
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in data transmission during the RRC_INACTIVE State, particularly for small data services and multicast/broadcast communications, due to high signaling overhead and increased power consumption, which hinders effective support for small data transmission and power saving in scenarios like IoT and mission-critical applications.
Innovation Solution
A method where a UE determines actions based on its current RRC state when receiving non-dynamic scheduling signaling, including transmitting HARQ-ACK on specific time-frequency resource blocks, and switching to RRC_IDLE State when necessary, to optimize data transmission and reduce power consumption, applicable to both Uu and PC5 air interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE switches to RRC_CONNECTED State for data transmission, then data transmission capability is improved, but signaling overhead and power consumption increase
Solution Approach 1:
The patent implements dynamic RRC state management where the UE can transition between RRC_INACTIVE and RRC_CONNECTED states based on data transmission requirements. The network can configure the UE to remain in RRC_INACTIVE state for small data transmissions by providing pre-configured uplink and downlink resources, avoiding the need to switch to RRC_CONNECTED state. This dynamic state management reduces unnecessary RRC state transitions, thereby reducing signaling overhead and power consumption while maintaining adequate data transmission capability.
2Productivity
If the UE switches to RRC_CONNECTED State for data transmission, then data transmission capability is improved, but signaling overhead increases
Solution Approach 1:
The patent employs pre-configuration of uplink and downlink resources while the UE is in RRC_INACTIVE state. The network provides the UE with pre-configured grant (PCG) for uplink transmission and pre-configured downlink resources before the UE needs to transmit data. This preliminary action eliminates the need for dynamic scheduling requests and resource allocation signaling when data transmission is needed, significantly reducing signaling overhead while maintaining data transmission capability.
3Productivity
If non-dynamic scheduling signaling is used to activate scheduling, then resource allocation efficiency is improved, but feedback mechanism complexity increases in RRC_INACTIVE State
Solution Approach 1:
The patent extracts the HARQ-ACK feedback mechanism from the traditional RRC_CONNECTED state context and adapts it for RRC_INACTIVE state operation. When the UE receives activation or deactivation signaling for pre-configured resources while in RRC_INACTIVE state, it provides HARQ-ACK feedback on pre-configured uplink resources. This extracted and adapted feedback mechanism maintains resource allocation efficiency through non-dynamic scheduling while simplifying the feedback process by using pre-configured resources rather than establishing complex dynamic feedback channels.
Data Source
AI summary
The present application provides a method and device for wireless communications. A first node receives a first signaling, the first signaling is used to activate a first scheduling, or the first signaling is used to de-activate a first scheduling; a first processor, as a response to receiving the first signaling, executes a first action, the first action is related to a current RRC state; wherein the phrase of the first action being related to a current RRC state comprises: for RRC_CONNECTED State and RRC_INACTIVE State, only when the current RRC state is RRC_CONNECTED State, the first action comprises transmitting a first HARQ-ACK on a first time-frequency resource block; the first scheduling is executed after being activated and before being deactivated. The present application can effectively support data transmission in RRC_INACTIVE State.