Pre-emptive Buffer Status Report Triggering in Cellular Relay Networks
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Solution Overview
Problem
In cellular communication systems, the existing methods for pre-emptive buffer status reports (BSR) face challenges in accurately predicting the timing of uplink data transmission, leading to delays and inefficiencies in radio resource allocation due to unclear trigger conditions and buffer size calculations.
Innovation Solution
The proposed solution involves a communication control method where a donor base station configures and transmits a trigger type for pre-emptive BSR to relay nodes, enabling them to trigger the report earlier and allowing parent nodes to accurately predict buffer sizes and allocate resources accordingly, thereby reducing scheduling delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for pre-emptive buffer status reports are used, then relay nodes can report buffer status, but the timing accuracy of uplink grants is poor and scheduling delays occur
Solution Approach 1:
The patent applies preliminary action by transmitting the trigger type configuration to relay nodes before actual uplink data transmission occurs. This allows relay nodes to proactively monitor buffer status and trigger pre-emptive BSR reports at optimal timing, enabling parent nodes to prepare uplink grants in advance rather than reacting to delayed buffer status changes.
Solution Approach 2:
The patent implements feedback mechanisms where relay nodes continuously report buffer status to parent nodes, and parent nodes adjust uplink grant timing based on these reports. The trigger type configuration enables intelligent feedback by allowing relay nodes to autonomously determine when buffer status changes warrant a report, creating a responsive closed-loop system that improves timing accuracy.
2Loss of time
If trigger type configuration is transmitted to relay nodes, then pre-emptive BSR timing is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by allowing different relay nodes to have customized trigger type configurations based on their specific roles, buffer characteristics, and traffic patterns. Instead of a uniform configuration approach, each relay node receives tailored trigger type settings that optimize its local performance, reducing the need for complex centralized management while maintaining overall system efficiency.
Data Source
AI summary
In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes transmitting, by a donor base station with a first relay node and a second relay node as lower nodes of the donor base station, a trigger type for a pre-emptive buffer status report (pre-emptive BSR) to the second relay node being a parent node of the first relay node. The communication control method includes triggering, by the first relay node, the pre-emptive buffer status report to the second relay node in accordance with the trigger type.