PDCP Uplink Split-Bearer Pre-Processing for Accurate Path Load Control
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Solution Overview
Problem
In New Radio (NR) wireless communication, the network's ability to control traffic load on uplink paths is reduced due to UE pre-determining data paths without transmission opportunities, leading to issues like data loss, unwanted jitter, and inefficient resource aggregation.
Innovation Solution
A method where PDCP PDUs pre-processed for RLC entities are considered in data volume calculations for uplink split bearer thresholds, with buffer status reporting adjusting data indication to both paths based on total data volume, ensuring accurate load control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE pre-determines data paths for RLC entities without waiting for transmission opportunities, then the data preparation efficiency is improved, but the network's ability to control traffic load on uplink paths deteriorates
Solution Approach 1:
The patent applies preliminary action by allowing the UE to pre-process PDCP PDUs and prepare data for transmission in advance, before actual transmission opportunities are granted. This enables the UE to populate RLC entities with data proactively, improving data preparation efficiency while the network retains control through grant-based transmission triggering.
2Productivity
If the UE stores RLC PDUs in buffer for extended periods awaiting grants, then the data transmission readiness is improved, but data loss risk increases due to timer expiration
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors the buffer status and grant timing, and adjusts uplink grants accordingly. This feedback loop ensures that data is transmitted before discard timers expire, maintaining reliability while keeping data ready for transmission.
Solution Approach 2:
The system dynamically adjusts the timing and sizing of uplink grants based on actual buffer status and network conditions. This dynamic grant allocation ensures that data is transmitted promptly after preparation, minimizing buffer storage time and reducing data loss risk from timer expiration.
3Device complexity
If the UE pre-processed data is not included in data volume calculations for threshold comparisons, then the reporting complexity is reduced, but the load control accuracy deteriorates
Solution Approach 1:
The patent merges the reporting of pre-processed data volume with the reporting of currently buffered data by including both in the total data volume calculation for threshold comparisons. This unified approach maintains accurate load control while avoiding separate reporting mechanisms, thus not significantly increasing complexity.
4Adaptability or versatility
If the network issues grants independently to each path without coordinated load control, then the transmission flexibility is improved, but the traffic load balance deteriorates
Solution Approach 1:
The patent uses feedback from buffer status reports to enable the network to coordinate grant issuance across multiple paths. The network monitors total data volume and path-specific buffer status, then issues grants in a coordinated manner to maintain load balance while preserving transmission flexibility through adaptive grant allocation.
Data Source
AI summary
According to an aspect, a UE in an uplink split-bearer configuration is configured to transmit PDUs by a first RLC entity via a first uplink transmission path and/or by a second RLC entity via a second uplink transmission path. The UE determines a total amount of data volume from PDCP data volume and RLC data volume pending for initial transmission in the two RLC entities. The UE decides whether submission of PDCP data volume is allowed to either of the two RLC entities or to only the first RLC entity, based on whether the total amount of data volume meets or exceeds a first threshold. The UE also reports the PDCP data volume to both the first and second uplink transmission paths or only the first uplink transmission path, based on whether the total amount of data volume meets or exceeds a first threshold.