Logical Channel Prioritization for Delay-Critical Uplink Data
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Solution Overview
Problem
Current wireless communication systems inefficiently handle data with varying importance levels, leading to the discard or delay of critical data packets in extended reality (XR) applications due to legacy QoS flow architectures that do not consider delay status information.
Innovation Solution
Enhanced layer 2 procedures that prioritize delay-critical data units by optimizing logical channel prioritization (LCP) and hybrid automatic repeat request (HARQ) processes, ensuring timely transmission of urgent data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy QoS flow architecture is used to map data packets to the same radio bearer, then resource utilization is simplified, but delay-critical data packets are discarded or delayed due to inability to differentiate importance levels
Solution Approach 1:
The patent segments data packets into different priority levels by introducing a new Priority Indicator Field (PIF) within the existing QoS flow architecture. This allows the system to differentiate delay-critical data from non-critical data without creating entirely separate QoS flows, thus maintaining resource utilization simplicity while improving transmission reliability for critical packets.
Solution Approach 2:
The patent applies preliminary action by marking data packets with priority indicators before transmission. The PDCP layer assigns priority levels to packets based on their importance, allowing the system to pre-identify delay-critical data that requires preferential treatment during scheduling and resource allocation, preventing discarding or delay of such packets.
2Productivity
If uplink resources are allocated using legacy UL scheduling procedures, then resource allocation is straightforward, but urgent data cannot be prioritized for transmission
Solution Approach 1:
The patent introduces dynamic prioritization into the uplink scheduling procedure by making the scheduling decision dependent on the priority indicator of data packets. The gNB scheduler dynamically adjusts resource allocation based on the PIF values of pending transmissions, allowing urgent data to be prioritized while maintaining a relatively simple scheduling framework that builds upon legacy procedures.
3Reliability
If all data packets are treated equally in the same QoS flow, then system operation is simplified, but delay status information is not considered leading to packet loss
Solution Approach 1:
The patent applies local quality by introducing priority differentiation at the packet level within the QoS flow. Instead of creating different QoS flows for different data types, the system maintains a single QoS flow structure but assigns different priority qualities to individual packets using the PIF, allowing delay-critical packets to be identified and handled with appropriate priority while keeping the overall system structure simple.
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, an LCP procedure may identify data units that satisfy a delay condition for transmission (e.g., delay-critical data units), and assign uplink resources allocated by an uplink grant to logical channels associated with the identified data units.