PDCP Aggregation Control via Air Interface Scheduling Delay
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Solution Overview
Problem
In wireless communications networks, increased packet reordering due to high cell load leads to reduced performance of PDCP Aggregation, especially with TCP window data stalling, and current methods for managing air interface scheduling delay are inefficient.
Innovation Solution
A method where a first network node hosting a PDCP entity receives an indication of scheduling delay from corresponding network nodes and adjusts PDCP aggregation accordingly, allowing for proactive deactivation or prioritization of radio resources to mitigate performance impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCP aggregation is activated over split radio bearer to increase data transmission capacity, then throughput is improved, but packet reordering increases under high cell load conditions
Solution Approach 1:
The patent implements dynamic switching between PDCP aggregation mode and non-aggregation mode based on real-time air interface scheduling delay conditions. The system transitions from a static configuration to a dynamic one where the PDCP entity can be activated or deactivated according to network conditions, thereby optimizing both throughput and packet delivery reliability under varying load conditions
Solution Approach 2:
The patent introduces a feedback mechanism where the second network node reports air interface scheduling delay information to the first network node. This feedback loop enables the first network node to make informed decisions about PDCP aggregation activation, adjusting the aggregation state based on actual network conditions to prevent packet reordering while maintaining high data transmission capacity when conditions permit
2Area of stationary object
If air interface scheduling delay increases under high cell load, then network coverage is maintained, but PDCP aggregation performance deteriorates due to packet reordering
Solution Approach 1:
The patent implements preliminary monitoring of air interface scheduling delay conditions before PDCP aggregation performance deteriorates. By continuously monitoring delay metrics and comparing them against threshold values, the system takes preventive action to deactivate PDCP aggregation before significant packet reordering occurs, thereby maintaining network coverage while preventing performance degradation
Solution Approach 2:
The patent applies preliminary anti-action by deactivating PDCP aggregation in advance when air interface scheduling delay exceeds acceptable thresholds. This preemptive measure counteracts the potential harmful effect of packet reordering before it significantly impacts performance, allowing the system to maintain stable operation under high cell load conditions
3Reliability
If PDCP aggregation is deactivated to reduce packet reordering, then packet delivery reliability is improved, but data transmission capacity decreases
Solution Approach 1:
The patent implements dynamic adaptation of PDCP aggregation state based on real-time network conditions. Rather than permanently deactivating aggregation, the system switches between aggregation and non-aggregation modes according to air interface scheduling delay measurements, ensuring packet delivery reliability when delays are high while restoring full data transmission capacity when conditions improve
Data Source
AI summary
Embodiments herein relate to, for example, a method performed by a first network node hosting a PDCP entity for handling communication of a UE in a wireless communications network. The first network node receives from one or more corresponding network nodes, an indication of a delay related to scheduling of data communication over an air interface between respective corresponding network node and the UE. The first network node further performs one or more actions related to aggregating PDCP communication over a split radio bearer between the first network node and two or more corresponding network nodes based on the received indication.