MAC Packet Dropping for XR Uplink Traffic Prioritization
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing packet dropping for extended reality (XR) traffic flows, particularly in 5G NR RAT, where proactive packet dropping is needed to handle PDU sets with varying QoS parameters, but current methods can disrupt other traffic flows and waste resources.
Innovation Solution
Implementing proactive packet dropping mechanisms at the MAC layer to determine the processing stage of data packets, allowing transmission only when they have passed from the RLC to the MAC layer, and constructing MAC PDUs to exclude non-droppable data packets, ensuring efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If proactive packet dropping is implemented for XR traffic flows, then resource utilization efficiency is improved, but other traffic flows may be disrupted
Solution Approach 1:
The patent segments packet dropping decisions by traffic flow type and processing stage. Different QoS flows are handled differently based on their characteristics and the stage at which packets are processed (RLC layer vs MAC layer), allowing selective dropping that protects certain flows while optimizing others.
Solution Approach 2:
The patent applies different packet dropping behaviors to different parts of the system based on local conditions. Specifically, packets are evaluated at different processing stages (RLC vs MAC layer) and different QoS flow types receive different treatment, optimizing resource usage locally without uniformly disrupting all traffic.
2Loss of energy
If packets are dropped at the RLC layer, then resource waste is reduced, but disruption to other traffic flows increases
Solution Approach 1:
The patent performs preliminary evaluation of packets at the RLC layer to determine if they should be dropped before they are processed further. By making dropping decisions early based on QoS flow characteristics and current system state, resources are not wasted on processing packets that will ultimately be discarded, while the impact on other flows is minimized through selective application.
Solution Approach 2:
The patent extracts and removes only the specific packets that should be dropped based on QoS flow analysis, rather than dropping all packets or using a blanket approach. This selective extraction allows resource optimization for XR traffic while preserving stability for other traffic flows.
3Productivity
If MAC PDUs are constructed to exclude non-droppable packets, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic MAC PDU construction where the composition of packets in each PDU is determined based on real-time conditions, QoS flow characteristics, and processing stage. This dynamic approach allows the system to optimize transmission efficiency by including only appropriate packets while adapting to changing conditions, rather than using a fixed construction method.
Data Source
AI summary
A method of wireless communication by a user equipment (UE) includes receiving at least one indication that at least one logical channel (LCH) is configured to support a proactive packet dropping behavior; determining, in accord with a logical channel prioritization (LCP) procedure, whether the at least one LCH will be mapped to an uplink grant; when the LCH will be mapped to the uplink grant, constructing a first medium access control (MAC) protocol data unit (PDU), for transmission on the uplink grant, that excludes at least one type of MAC control element (CE) or excludes data from at least one type of LCH; and when none of the at least one LCH will be mapped to the uplink grant, constructing, in accord with the LCP procedure, a second MAC PDU for transmission on the uplink grant.