Buffer Dwell Time Target for 5G RAN Flow Control
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in balancing high bandwidth and low latency due to the lack of effective buffer dwell time management in flow control interactions between upper and lower layer RAN nodes, leading to throughput degradations and out-of-order data delivery in multi-connectivity scenarios.
Innovation Solution
The method involves determining a Buffer Dwell Time Target (BDTT) and providing it to both upper and lower layer RAN nodes to align Desired Buffer Size (DBS) values, ensuring synchronized data delivery and improving flow control interaction by defining a standardized BDTT for use in Downlink Data Delivery Status messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If buffer size is increased to ensure sufficient data for radio bandwidth utilization, then data delivery reliability is improved, but latency increases due to longer buffer dwell time
Solution Approach 1:
The patent introduces a new parameter BDTT (Buffer Dwell Time Target) that dynamically adjusts the buffer dwell time based on network conditions and QoS requirements. By changing the time parameter from a static implicit value to a dynamically controllable variable, the system can optimize the trade-off between buffer size and latency, achieving reliable data delivery without excessive buffer dwell time.
Solution Approach 2:
The patent makes the buffer management system dynamic by introducing BDTT as a configurable parameter that can be adjusted in real-time. The flow control mechanism transitions from static buffer management to dynamic adaptation, allowing the system to respond to changing network conditions and optimize performance for different service requirements.
2Adaptability or versatility
If Desired Buffer Size values are not aligned between different vendor nodes, then interoperability is improved through vendor independence, but flow control interaction deteriorates leading to out-of-order data delivery
Solution Approach 1:
The patent creates equipotentiality in the flow control interaction by establishing a common reference point (BDTT) that all vendor nodes use when calculating their Desired Buffer Size values. This ensures that nodes from different vendors operate at the same reference level, eliminating mismatches and ensuring consistent flow control behavior across multi-vendor deployments while maintaining vendor independence.
Solution Approach 2:
The patent enhances feedback mechanisms by including BDTT information in flow control messages exchanged between nodes. This allows nodes to receive feedback not only about buffer status but also about the target dwell time, enabling them to adjust their buffer management strategies to maintain synchronized data delivery across the network.
3Device complexity
If buffer dwell time is not targeted in PDCP PDU, then protocol simplicity is maintained, but throughput deteriorates due to reordering timer expiration
Solution Approach 1:
The patent applies preliminary action by setting the BDTT parameter in advance before data transmission. By pre-configuring the target buffer dwell time in the PDCP configuration, the system prepares the buffer management strategy beforehand, preventing reordering timer issues and throughput degradation without adding complex runtime processing to the PDCP protocol itself.
Data Source
AI summary
The present disclosure relates to the field of wireless communication, and in particular to a method and arrangement for improving flow control interaction in a low latency distributed radio access network, RAN, including an upper layer RAN node and at least one lower layer RAN node. The method includes determining a Packet Data Convergence Protocol, PDCP, Protocol Data Unit, PDU, buffer dwell time target, BDTT, and providing the BDTT to the upper layer RAN node and/or the lower layer RAN node.