Buffer Status Table Selection for Carrier Aggregation
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Solution Overview
Problem
In mobile communication systems supporting carrier aggregation, User Equipment (UE) faces inefficiencies in reporting scheduling information, such as buffer status and power headroom, due to the aggregation of multiple downlink and uplink carriers, which affects data rate and channel properties.
Innovation Solution
A method for efficiently handling scheduling information by determining a new buffer status table based on control messages from the Evolved Node B (ENB) and generating appropriate Medium Access Control (MAC) Packet Data Units (PDUs) for Buffer Status Reports (BSR) and Power Headroom Reports (PHR), including triggering and transmitting these reports only when necessary, to optimize data transmission and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to increase data rate, then throughput is improved, but scheduling information reporting becomes inefficient
Solution Approach 1:
The patent segments the scheduling information reporting by introducing separate buffer status tables for different uplink carrier scenarios (single carrier vs. multiple carriers). This allows the UE to selectively report buffer status using the appropriate table based on the current carrier aggregation configuration, making the reporting mechanism more efficient and tailored to specific scenarios rather than using a single generic reporting method.
2Ease of operation
If buffer status is reported using related art method, then reporting simplicity is maintained, but reporting efficiency deteriorates due to multiple carriers
Solution Approach 1:
The patent implements dynamic buffer status table selection based on the current carrier aggregation configuration. The UE dynamically chooses between different buffer status tables (first table for single uplink carrier, second table for multiple uplink carriers) according to the active carrier configuration, allowing the reporting mechanism to adapt efficiently to changing network conditions while maintaining operational simplicity.
3Quantity of substance
If power headroom is reported without considering channel properties, then reporting overhead is reduced, but accuracy of power management deteriorates
Solution Approach 1:
The patent applies local quality by introducing separate buffer status tables tailored to specific uplink carrier configurations. The first buffer status table is optimized for single uplink carrier scenarios while the second table is optimized for multiple uplink carrier scenarios. This allows the power headroom and buffer status reporting to be accurately matched to the specific channel properties and carrier configuration being used, improving measurement precision without significantly increasing overall reporting overhead.
Data Source
AI summary
A method and an apparatus for processing scheduling information in a terminal into which a plurality of forward carriers and reverse carriers are aggregated are provided. The method includes receiving a control message from a base station, the control message including information on a reverse carrier added by the carrier aggregation, and determining a new buffer state table to be used for reporting the state of buffers to the base station, based on the information included in the control message.