HARQ Process Selection for Delay-Critical Uplink Data
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Solution Overview
Problem
Existing wireless communication systems inefficiently handle data units with varying levels of importance, leading to the discard or delay of critical PDU sets in XR applications due to legacy QoS architectures that do not consider delay status information.
Innovation Solution
Implement enhanced layer 2 procedures that prioritize delay-critical data units by adapting HARQ processes and logical channel prioritization (LCP) to allocate uplink resources based on delay status, ensuring timely transmission of urgent data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy QoS architectures are used to handle data units, then system compatibility is maintained, but delay-critical data units are discarded or delayed due to inability to prioritize based on delay status
Solution Approach 1:
The patent segments the QoS handling mechanism by introducing separate priority determination procedures for delay-critical data versus regular data. The MAC entity is divided into distinct functional components: one handling legacy QoS flows and another specifically identifying and prioritizing delay-critical PDU sets based on delay status information, allowing simultaneous operation of different priority rules
Solution Approach 2:
The patent applies preliminary action by determining the delay status of PDU sets before transmission scheduling occurs. The MAC entity identifies delay-critical PDU sets in advance and determines their priority before the uplink transmission procedure, ensuring that time-sensitive data is flagged and prioritized before resource allocation decisions are made
2Productivity
If all PDU sets are mapped to the same QoS flow and radio bearer, then resource utilization is simplified, but delay-critical data cannot be distinguished from non-critical data
Solution Approach 1:
The patent applies local quality by maintaining uniform QoS flow mapping for general data while introducing localized priority differentiation specifically for delay-critical PDU sets. The MAC entity performs local analysis of delay status information for individual PDU sets and applies differentiated priority handling only where needed, rather than restructuring the entire QoS architecture
Solution Approach 2:
The patent introduces delay status information as an intermediary layer between the QoS flow mapping and the transmission scheduling. This intermediary mechanism allows the system to maintain simple QoS flow mapping while still enabling priority differentiation through the MAC entity's ability to determine and act upon delay status without requiring separate QoS flows for different data types
3Ease of operation
If HARQ process selection does not consider delay status, then process selection simplicity is maintained, but urgent data transmission is not optimized
Solution Approach 1:
The patent introduces dynamics into HARQ process selection by making the priority determination adaptive based on delay status information. The MAC entity dynamically adjusts the priority of PDU sets based on their delay characteristics, allowing the system to switch between simple and priority-aware selection modes depending on the urgency of the data being transmitted
Data Source
AI summary
Various aspects of the present disclosure relate to enabling a network to implement the use of delay status information when performing certain reporting (delay status reports, or DSR) and/or transmission procedures (logical channel prioritization (LCP) procedures). For example, hybrid automatic repeat request (HARQ) processes may be adapted to prioritize delay-critical data units.