Uplink Data Transmission in RRC Inactive State
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Solution Overview
Problem
In 5G wireless communication, switching from a radio resource control (RRC) idle or inactive state to a connected state generates significant signaling overhead, leading to increased time delay and power consumption, especially when sending small data packets.
Innovation Solution
A method for a terminal to determine its uplink synchronization state and the validity of pre-configured physical uplink shared channel (PUSCH) resources, allowing data transmission on valid PUSCH resources while in an RRC inactive state, reducing the need for state transitions and minimizing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal switches from RRC idle or inactive state to connected state to send data, then data transmission can be performed, but signaling overhead increases significantly
Solution Approach 1:
The base station pre-configures PUSCH resources for the terminal in advance while the terminal is in RRC inactive state. This preliminary allocation of uplink resources allows the terminal to send data immediately without transitioning to connected state, thereby reducing signaling overhead while ensuring data transmission capability.
2Reliability
If the terminal switches from RRC idle or inactive state to connected state to send data, then data transmission can be performed, but time delay increases
Solution Approach 1:
PUSCH resources are pre-configured and allocated to the terminal before it needs to send data. The terminal maintains these resource allocations in the RRC inactive state, allowing immediate data transmission without the time-consuming state transition process, thus reducing latency.
3Reliability
If the terminal switches from RRC idle or inactive state to connected state to send data, then data transmission can be performed, but power consumption increases
Solution Approach 1:
The terminal pre-allocates PUSCH resources and maintains them in the RRC inactive state. When data needs to be sent, the terminal can use these pre-configured resources directly without transitioning to connected state, avoiding the high power consumption associated with state transitions and maintaining lower energy usage.
4Loss of energy
If the terminal uses pre-configured PUSCH resources in RRC inactive state, then signaling overhead is reduced, but resource validity management becomes complex
Solution Approach 1:
The base station sends feedback information to the terminal regarding the validity state of pre-configured PUSCH resources. The terminal monitors this feedback and adjusts its data transmission behavior accordingly, using the resources when valid and switching to alternative methods when invalid. This feedback mechanism simplifies the complexity of resource management by providing clear validity indicators.
Data Source
AI summary
A method for sending data, applied to a terminal, includes: determining an uplink synchronization state of the terminal and a state of a physical uplink shared channel (PUSCH) resource pre-configured by a base station for the terminal; and sending, on the physical uplink shared channel (PUSCH) resource data to the base station in response to the terminal being in the uplink synchronization state and the physical uplink shared channel (PUSCH) resource being valid, where the data is data of the terminal in a radio resource control (RRC) inactive state.