Buffer Status Reporting Segmentation for Wireless Scheduling Precision
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Solution Overview
Problem
The 3GPP LTE system faces challenges in effectively reporting buffer sizes due to increased buffer sizes with the introduction of multiple carriers and uplink MIMO, leading to reduced scheduling precision for UL radio resources, as conventional BSR methods cannot distinguish between buffer sizes ranging from 150 kbytes to 1500 kbytes.
Innovation Solution
A method and apparatus for reporting buffer status information in a wireless communication system, where a user equipment reports a first part indicating if the buffer size exceeds a specific value (150 kbytes) and a second part providing additional information on the excess buffer size, using specific formats within MAC PDUs to differentiate and accurately convey buffer sizes exceeding the reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional BSR methods are used, then the system maintains simplicity in information reporting, but the scheduling precision for UL radio resources deteriorates when buffer sizes exceed 150 kbytes
Solution Approach 1:
The buffer size report is segmented into two parts: a first part indicating whether the buffer size exceeds a specific value (150 kbytes), and a second part providing additional information on the excess buffer size. This segmentation allows the system to maintain simplicity for small buffers while achieving high precision for large buffers, resolving the contradiction between reporting simplicity and precision.
2Measurement precision
If the buffer size field is increased to report larger ranges, then the reporting precision improves, but the compatibility with legacy systems deteriorates
Solution Approach 1:
The reporting mechanism is segmented such that the first part uses a format compatible with legacy systems while the second part provides extended precision information. This allows new systems to achieve high precision reporting without breaking compatibility with legacy systems that can interpret the first part using existing protocols.
Solution Approach 2:
The first part of the report acts as an intermediary that bridges legacy and new systems. Legacy systems can process the first part using existing BSR methods, while enhanced systems can utilize both parts to achieve higher precision, thus maintaining compatibility while enabling advanced functionality.
3Ease of operation
If a single BSR format is used, then the system maintains ease of operation, but the ability to distinguish different buffer size ranges deteriorates
Solution Approach 1:
The BSR format is segmented into two functional parts that work together: the first part provides coarse-grained buffer size classification for easy operation, while the second part adds fine-grained precision. This segmented approach maintains operational simplicity while enhancing the ability to distinguish different buffer size ranges.
Solution Approach 2:
The reporting system transitions from a single-dimension format to a two-dimension format, where the first part provides one level of precision and the second part adds another level. This dimensional expansion enables the system to maintain ease of operation while significantly improving buffer size distinction capability.
Data Source
AI summary
A method and apparatus of reporting an amount of information in a wireless communication system is provided. A user equipment reports a first part indicating that an amount of information is larger than a specific value, and reports a second part indicating the amount of the information.