Short-Format BSR Control Element for Empty Buffer Status
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Solution Overview
Problem
Current LTE systems lack a defined format for Buffer Status Reporting (BSR) control elements when all logic channel groups of a user equipment have no buffered data, leading to ambiguity in reporting during resource availability after a serving cell change or periodic timer expiration.
Innovation Solution
A method and apparatus that trigger a BSR procedure and utilize a short-format BSR control element for reporting when there are no buffered data in every logic channel group of the user equipment, ensuring consistent reporting even when all channels are empty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current BSR format selection rule is applied (short format for one logic channel group, long format for multiple), then the reporting efficiency is improved when data exists, but the system reliability deteriorates when all logic channel groups are empty due to undefined behavior
Solution Approach 1:
The patent changes the parameter of BSR control element format from dynamic selection based on data presence to a fixed short-format selection when all logic channel groups are empty. This parameter change resolves the ambiguity in the prior art by defining a specific format (short format with LCGI=0 and data amount=0) for the previously undefined scenario, thereby improving system reliability while maintaining reporting efficiency.
2Measurement precision
If the BSR procedure is triggered after serving cell change or periodic timer expiration, then the system can detect buffer status changes, but the protocol ambiguity causes uncertainty in control element format selection
Solution Approach 1:
The patent simplifies the protocol by changing the format selection parameter to a deterministic rule: when all logic channel groups are empty, use short-format BSR control element. This eliminates the need for complex protocol interpretation and reduces device complexity while maintaining precise buffer status detection through the standardized format.
3Device complexity
If no BSR format is defined for empty buffer scenarios, then the protocol remains simple for common cases, but the system loses the ability to report empty buffer status reliably
Solution Approach 1:
The patent resolves the information loss by changing the BSR control element parameters (format type, LCGI field, and data amount field) to convey empty buffer status. By defining the short-format BSR with specific parameter values (LCGI=0, data amount=0) for empty buffers, the system maintains protocol simplicity while preventing information loss about buffer status.
Data Source
AI summary
The present invention provides a method for performing Buffer Status Reporting (BSR) in a user equipment (UE) of a wireless communication system. The method includes steps of triggering a BSR procedure when a predefined condition is satisfied, and using a short-format BSR control element to perform BSR when no buffered data exists in every logic channel group of the UE.