LTE Buffer Size Index Reporting for Carrier Aggregation Scheduling
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Solution Overview
Problem
The existing Buffer Status Report (BSR) system in LTE networks is inadequate for accurately representing buffer sizes above 150K, leading to inefficient resource allocation in LTE-Advanced systems with higher throughput, as it cannot distinguish between buffer statuses from 150K to 1500K, hindering reasonable resource allocation and scheduling efficiency.
Innovation Solution
A method and system for reporting a buffer size index that involves presetting two tables: a first table used by the LTE system and a second table with increased maximum and minimum buffer size values, allowing for a greater number of buffer size indexes, enabling the UE to inquire on either table based on data transmission amounts, thereby improving resource allocation precision in LTE-Advanced systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing BSR system with a single buffer size index table is used, then the system is simple and compatible with LTE, but it cannot accurately represent buffer sizes above 150K, leading to inefficient resource allocation in LTE-Advanced systems
Solution Approach 1:
The patent divides the buffer size index table into multiple tables: a first table for smaller buffer sizes (0-150K) and a second table for larger buffer sizes (150K-1.5M). This segmentation allows each table to be optimized for its specific range, improving measurement precision for large buffers while keeping the overall system manageable through modular structure.
Solution Approach 2:
The patent introduces a new dimension to the buffer size representation by adding a second table that extends the maximum buffer size capacity from 150K to 1.5M. This dimensional expansion allows the system to represent larger buffer sizes with the same 6-bit index format, maintaining compatibility while improving measurement precision.
2Productivity
If the buffer size index table is extended to support larger buffer sizes, then resource allocation precision improves, but the system complexity and scheduling overhead increase
Solution Approach 1:
The patent makes the buffer size index table system universal by designing it to support both LTE and LTE-Advanced systems. The first table maintains compatibility with existing LTE systems, while the second table enables LTE-Advanced systems to handle larger buffer sizes. This multi-functionality allows the same BSR mechanism to serve different system requirements without increasing overall complexity.
Solution Approach 2:
The patent changes the parameters of the buffer size index table by introducing a second table with extended range (150K-1.5M) while maintaining the same 6-bit index format. This parameter change allows the system to represent larger buffer sizes without increasing the bit width, thus improving resource allocation efficiency for LTE-Advanced while keeping the signaling overhead constant.
3Loss of information
If a single buffer size index table is used, then the signaling overhead is low, but the scheduling accuracy for large buffer sizes deteriorates
Solution Approach 1:
The patent segments the buffer size range into two distinct tables: the first table covers 0-150K and the second table covers 150K-1.5M. This segmentation allows each table to provide detailed granularity for its specific range, ensuring that buffer status information precision is maintained across the entire extended range without requiring a single large table that would waste resources on unused granularity.
Solution Approach 2:
The patent extends the buffer size coverage by adding another dimension to the index table structure - a second table that multiplies the maximum representable buffer size by 10 (from 150K to 1.5M). This dimensional extension allows the system to cover a wider quantity range while maintaining the same level of information precision through the 6-bit index format.
Data Source
Figure 1
AI summary
The disclosure claims a method and system for reporting a buffer size index; the method includes: presetting a first table which is a buffer size index table used by a Long Term Evolution (LTE) system, and presetting a second table which is a buffer size index table by increasing a maximum buffer size value to Bmax-A and increasing a minimum buffer size value to Bmin-A based on the first table, or by increasing a maximum buffer size value to Bmax-A, and increasing a number of the buffer size index to NLTE-A; choosing, by a User Equipment (UE) in reporting a Buffer State Report (BSR), to inquire on the preset first table or second table for the buffer size index; and sending, by the UE, the inquired buffer size index to a base station in the BSR. By adopting the method and system according to the disclosure, the scheduling efficiency in carrier aggregation is improved effectively and reasonable resource allocation is ensured.