RRC Inactive Uplink Data Transmission via Non-AM RLC Entity
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Solution Overview
Problem
In wireless communication systems, there is a challenge in efficiently transmitting data units in the RRC INACTIVE state due to the need for additional downlink transmissions for RLC status reporting, which wastes resources and consumes power.
Innovation Solution
A method where a user equipment (UE) configures a Packet Data Convergence Protocol (PDCP) entity associated with both Acknowledged Mode (AM) and non-AM Radio Link Control (RLC) entities, transmitting data using AM RLC in the RRC CONNECTED state and non-AM RLC in the RRC INACTIVE state without performing retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AM RLC entities are used for data transmission, then reliability is improved through retransmission, but device complexity and power consumption increase due to monitoring RLC status reports
Solution Approach 1:
The patent segments the RLC entity functionality by introducing separate AM and non-AM RLC entities. The AM RLC entity handles reliable data transmission with retransmission, while the non-AM RLC entity handles status reporting without retransmission. This segmentation allows the system to achieve reliability where needed while avoiding the complexity of monitoring RLC status reports for all data transmissions.
2Productivity
If RLC status reporting is performed in RRC INACTIVE state, then data transmission capability is maintained, but network resource wastage occurs due to additional downlink transmissions
Solution Approach 1:
The patent extracts the status reporting function from the main data transmission path by using a separate non-AM RLC entity. This extracted status reporting mechanism operates independently without requiring additional downlink transmissions for status updates, thereby maintaining data transmission capability in RRC INACTIVE state while eliminating network resource wastage.
3Measurement precision
If UE monitors RLC status reports, then data transmission accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the RLC entity type adaptable based on transmission requirements. The system dynamically selects between AM and non-AM RLC entities depending on whether reliability through retransmission is needed or whether resource efficiency is prioritized. This dynamic selection allows the UE to avoid continuous monitoring of RLC status reports while maintaining appropriate transmission accuracy for each scenario.
Data Source
AI summary
The present invention relates to a method of transmitting uplink data by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of configuring a Packet Data Convergence Protocol (PDCP) entity, wherein the PDCP entity is associated with at least one Acknowledged Mode (AM) Radio Link Control (RLC) entities and a non-AM RLC entity; transmitting a first uplink data using the at least one AM RLC entities in a Radio Resource Control (RRC) CONNECTED state; receiving a RRC INACTIVE transition command; and transmitting a second uplink data using the non-AM RLC entity in the RRC INACTIVE state.