Relay Node Buffer State Reporting for Uplink Resource Timing
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Solution Overview
Problem
Existing mobile communication systems face challenges in efficiently allocating uplink radio resources to relay nodes, leading to delays or wastage due to inadequate prediction of data transmission requirements, which affects communication quality and resource utilization efficiency.
Innovation Solution
Introduction of a preemptive Buffer State Report (BSR) mechanism that allows relay nodes to proactively report the amount of data yet to be transmitted, enabling the upper node to schedule resources appropriately, considering potential data volumes across multiple hops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the relay node uses conventional buffer state reporting mechanisms, then the upper node receives buffer state information, but the reporting is delayed and resource allocation is suboptimal
Solution Approach 1:
The relay node performs preliminary actions by detecting predetermined events (such as data arrival, resource allocation, or buffer threshold events) and proactively transmitting buffer state reports before the upper node would normally request them. This preliminary reporting enables the upper node to allocate resources in advance, reducing delays and improving resource allocation efficiency.
2Loss of time
If the relay node transmits buffer state reports frequently, then the upper node can allocate resources timely, but the signaling overhead increases
Solution Approach 1:
Instead of continuous or overly frequent reporting, the relay node implements periodic event-triggered reporting. Buffer state reports are transmitted at regular intervals or when specific predetermined events occur (such as buffer threshold crossings, data arrival events, or resource allocation events), balancing timely resource allocation with reduced signaling overhead compared to continuous reporting.
3Measurement precision
If the relay node monitors events in the first functional unit, then accurate resource allocation information is obtained, but the complexity of event detection increases
Solution Approach 1:
The relay node applies local quality by implementing different event detection mechanisms for different functional units. The first functional unit (connected to lower nodes) monitors specific local events such as data arrival, buffer threshold crossings, or resource allocation events, while the second functional unit (connected to upper nodes) handles corresponding reporting. This localized event monitoring ensures accurate resource allocation information while managing detection complexity through functional separation.
Data Source
AI summary
A communication control method is a method using a relay node that includes a first functional unit connecting wirelessly to a lower node and a second functional unit connecting wirelessly to the upper node and relays data from the lower node to the upper node. The communication control method includes detecting, by the second functional unit, that a predetermined event related to resource allocation to the lower node is occurred in the first functional unit, and transmitting, by the second functional unit, to the upper node, in a case of detecting occurrence of the predetermined event, a first buffer state report including size information indicating an amount of data having yet to be transmitted to the upper node. The detecting includes detecting the occurrence of the predetermined event by monitoring an event occurring in the first functional unit, or by receiving, from the first functional unit, a notification indicating that the predetermined event is occurred.