D2D Padding BSR Triggering in LTE User Equipment
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Solution Overview
Problem
The existing LTE systems lack a mechanism for triggering Buffer Status Reporting (BSR) in Device to Device (D2D) communication, specifically for padding BSR, which is necessary for efficient resource allocation and communication between devices.
Innovation Solution
A method and apparatus that allow user equipment to determine the size of padding resources and decide whether to trigger a D2D padding BSR based on the size of these resources and the priority of D2D padding BSR Media Access Control (MAC) control elements, enabling efficient padding BSR triggering in D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is enabled in LTE system, then direct communication between devices is achieved, but the mechanism for triggering padding BSR in D2D communication is missing
Solution Approach 1:
The patent segments the BSR triggering mechanism into different types (regular BSR, periodic BSR, and padding BSR) specifically for D2D communication. This segmentation allows the system to address the missing padding BSR triggering mechanism by defining specific conditions and procedures for each BSR type, thereby completing the overall BSR framework for D2D communication while maintaining the existing regular and periodic BSR mechanisms.
2Loss of information
If multiple BSRs are triggered concurrently, then buffer status information can be reported, but only the highest priority BSR is reported
Solution Approach 1:
The patent applies local quality by assigning different priorities to different BSR types (regular BSR, periodic BSR, and padding BSR) and defining specific triggering conditions for each. This allows the system to selectively report BSRs based on their priority and triggering conditions, ensuring that the most critical buffer status information is reported first while maintaining a structured approach to handling multiple concurrent BSR triggers.
3Adaptability or versatility
If D2D resource allocation is separated from D2N BSR procedure, then D2D transmission resources can be requested separately, but the complexity of resource management increases
Solution Approach 1:
The patent implements universality by creating a unified BSR triggering framework that handles both D2N (Device-to-Network) and D2D (Device-to-Device) communication scenarios. The same MAC PDU structure and BSR triggering mechanisms are used for both communication types, allowing the system to manage D2D and D2N resources through a common protocol while maintaining the flexibility to allocate resources separately when needed.
Data Source
AI summary
Embodiments of the present invention provide a method and device for triggering Buffer State Reporting (BSR), which relate to the wireless communication field and are used to solve the problem of lacking a triggering mechanism for Device-to-Device communication Padding Buffer State Reporting (D2D Padding BSR) in the prior art. In an embodiment of the present invention, a user equipment determines the size of padding resources when organizing a Device-to-Network-link Media Access Control layer Protocol Data Unit (D2N MAC PDU), and decides whether to trigger the D2D Padding BSR or not according to the size of the padding resources and the priority of the Padding Buffer State Reporting Media Access Control layer Control Element carrying the Device-to-Device communication (D2D Padding BSR MAC CE), thereby the D2D Padding BSR triggering mechanism is achieved.