Uplink Feedback for Mobile Terminated Data in RRC Inactive State
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Solution Overview
Problem
Existing technologies face inefficiencies in user equipment (UE) feedback for data transmission in the radio resource control (RRC) inactive state, leading to increased latency, power consumption, and signaling overhead, particularly for mobile terminated (MT) data transmission, which affects reliability and throughput.
Innovation Solution
A method for UE feedback in the RRC inactive state involves receiving configuration parameters for measurement and reporting, transmitting measurement reports based on quality of experience measurements, and using configured grants for uplink transmissions, enabling efficient acknowledgement and channel state information feedback without transitioning to the RRC connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE transitions to RRC connected state for data transmission, then reliability and throughput are improved, but latency and power consumption increase
Solution Approach 1:
The network configures UE with uplink feedback resources and parameters while in RRC inactive state, enabling UE to immediately transmit acknowledgments and channel state information without state transition. This preliminary configuration allows data transmission to proceed with connected-state reliability while avoiding the latency of state transitions.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network provides configured grant resources and uplink feedback parameters that enable UE to communicate effectively in inactive state. This intermediary configuration bridge allows reliable communication without requiring full RRC connection establishment.
2Productivity
If UE transitions to RRC connected state for data transmission, then throughput is improved, but power consumption increases
Solution Approach 1:
The network pre-configures UE with uplink feedback parameters, configured grant resources, and transmission parameters before data transmission. This preliminary action enables UE to maintain inactive state while still performing efficient data transmission with connected-state throughput, avoiding the energy cost of full RRC connection establishment.
Solution Approach 2:
UE autonomously transmits uplink feedback, acknowledgments, and channel state information using pre-configured resources without requiring network scheduling or state transition. This self-service capability allows efficient data transmission while UE remains in low-power inactive state.
3Loss of time
If UE transmits feedback in RRC inactive state using configured grants, then latency is reduced, but signaling overhead increases
Solution Approach 1:
The network provides comprehensive uplink feedback configuration including resources, parameters, and transmission rules in advance while UE is in inactive state. This preliminary configuration enables immediate feedback transmission without additional signaling exchanges, reducing latency while the one-time configuration overhead is amortized over multiple transmissions.
4Use of energy by moving object
If UE transmits feedback in RRC inactive state, then power consumption is reduced, but device complexity increases
Solution Approach 1:
UE autonomously determines when to transmit feedback, selects appropriate resources from pre-configured options, and transmits acknowledgments and channel state information without network intervention. This self-service approach reduces power consumption by avoiding state transitions while the complexity is managed through standardized procedures and pre-configured parameters.
Data Source
AI summary
A method of uplink feedback for mobile terminated (MT) data transmission includes receiving, by a user equipment (UE) from a base station (BS), a message indicating transitioning of the UE from a radio resource control (RRC) connected state to an RRC inactive state and transmitting, while in the RRC inactive state, UE feedback associated with downlink transmission in the RRC inactive state.