Uplink Feedback Control via PDCP Duplication State
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Solution Overview
Problem
In wireless communication systems, the introduction of new radio technologies has led to increased data and control information transmission, overwhelming base stations with limited resources, and poses challenges in managing delay or latency, particularly in applications sensitive to performance delays.
Innovation Solution
A method for a user equipment (UE) to autonomously activate or deactivate uplink feedback based on the downlink Packet Data Convergence Protocol (PDCP) duplication state, reducing unnecessary feedback by determining whether PDCP duplication for downlink is activated and only transmitting status reports when necessary, especially for Multimedia Broadcast Multicast Services (MBMS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink feedback information is transmitted for every downlink data unit, then reliability of data reception is improved, but uplink resource consumption and base station processing load increase
Solution Approach 1:
The patent extracts and removes unnecessary feedback transmissions by checking the PDCP duplication state before transmitting status reports. When PDCP duplication is detected, the corresponding status report transmission is extracted/removed from the feedback process, reducing uplink feedback quantity while maintaining reliability for non-duplicated data.
Solution Approach 2:
The patent implements dynamic feedback transmission by making the status report transmission conditional on the PDCP duplication state. The feedback mechanism transitions from static (always transmit) to dynamic (transmit only when needed), adapting the feedback behavior based on the current PDCP configuration state.
2Reliability
If status reports are transmitted for all downlink data units, then data transmission reliability is improved, but transmission delay increases
Solution Approach 1:
The patent removes unnecessary status report transmissions by checking the PDCP duplication state. When duplication is detected, the corresponding status report is extracted/removed, reducing the number of feedback transmissions and thereby reducing overall feedback transmission delay while maintaining reliability through the duplication mechanism itself.
3Reliability
If PDCP duplication is activated for downlink, then data transmission reliability is improved, but uplink feedback management complexity increases
Solution Approach 1:
The patent implements self-service by having the UE autonomously check the PDCP duplication state and independently determine whether to transmit status reports. This self-service mechanism eliminates the need for complex network-side control and coordination, simplifying feedback management while maintaining reliability through autonomous decision-making based on the duplication state.
Data Source
AI summary
The present invention relates to a method of transmitting a status report by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving information about whether a Packet Data Convergence Protocol (PDCP) duplication for downlink is activated or not; receiving at least one data unit from a network; determining whether the status report related to the at least one data unit is triggered or not; based on whether the PDCP duplication for the downlink is activated or not; and transmitting the triggered status report related to the at least one data unit, wherein, based on the PDCP duplication for the downlink being activated, the status report related to the at least one data unit is not triggered.