Buffer Status Reporting for Machine Type Communication
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Solution Overview
Problem
In current LTE wireless communication systems, machine type communication (MTC) devices frequently trigger buffer status reports (BSR) due to small data transmissions, leading to increased signaling overhead and decreased system performance, especially for periodic data transmissions.
Innovation Solution
A mobile communications device with a wireless module and controller module that determines whether to trigger a BSR based on a comparison of MTC data size and a threshold value, accumulating data before reporting, thereby reducing unnecessary BSR triggers and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If regular BSR is triggered for every small MTC data transmission, then the buffer status is reported accurately, but the signaling overhead increases and system performance decreases
Solution Approach 1:
The patent introduces a data size threshold parameter that changes the BSR triggering behavior. When MTC data size is below the threshold, BSR is suppressed; when above, BSR is triggered normally. This parameter-based differentiation resolves the contradiction by adapting the reporting behavior to the actual data characteristics.
Solution Approach 2:
The patent applies different BSR triggering rules to different data types. Specifically, MTC data with small size receives special treatment (BSR suppression) while other data types maintain normal BSR triggering. This local quality approach allows the system to optimize for MTC scenarios without affecting other communication types.
2Loss of time
If regular BSR is triggered for every small MTC data transmission, then the buffer status is reported timely, but the system overall performance decreases
Solution Approach 1:
The patent uses a threshold parameter to control BSR triggering for MTC data. By comparing data size against this threshold, the system decides whether to trigger BSR, thereby balancing timeliness requirements with overall system performance for MTC applications.
Solution Approach 2:
The patent applies partial action by selectively suppressing BSR only for small MTC data transmissions while maintaining normal BSR triggering for other scenarios. This partial suppression is sufficient to improve system performance without completely eliminating buffer status reporting functionality.
3Reliability
If BSR is triggered frequently for small MTC data, then the buffer status is monitored closely, but the number of scheduling requests increases
Solution Approach 1:
The patent introduces a data size threshold parameter that modifies the BSR triggering condition for MTC data. This parameter change directly reduces the number of scheduling requests by preventing BSR triggers for small data transmissions, while still maintaining adequate buffer status monitoring for significant data amounts.
Solution Approach 2:
The patent applies partial monitoring by suppressing BSR only for small MTC data transmissions. This partial action reduces the quantity of scheduling requests while maintaining sufficient buffer status monitoring for larger data transmissions that truly require network attention.
Data Source
AI summary
A mobile communications device with a wireless module and a controller module for performing a buffer status reporting procedure is provided. The wireless module performs wireless transmissions and receptions to and from a cellular station of a service network. The controller module receives machine type communication (MTC) data, determines whether to trigger a buffer status report (BSR) according to a comparison result of the data size of the MTC data and a threshold value when the MTC data arrives at an empty transmission buffer, and if so, transmits the BSR to the cellular station via the wireless module.