ProSe BSR Cancellation for D2D Resource Allocation
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE, lack the capability to efficiently cancel triggered buffer status reports (BSRs) for proximity-based services (ProSe) in device-to-device (D2D) transmissions, leading to resource allocation challenges and potential delays in public safety communications.
Innovation Solution
A method and apparatus for a user equipment (UE) to trigger and cancel ProSe BSRs based on specific conditions, prioritizing uplink transmissions and utilizing additional timers and logical channel groups to manage BSRs effectively, ensuring efficient resource allocation for D2D communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ProSe BSR is triggered to report buffer status for D2D transmission, then the eNB can allocate resources for D2D communication, but unnecessary BSR transmissions consume uplink resources and increase signaling overhead when resources are already sufficient
Solution Approach 1:
The patent applies preliminary anti-action by preemptively canceling triggered ProSe BSRs when the eNB determines that sufficient uplink resources are already allocated. The eNB sends a cancellation indication to the UE before the UE transmits the BSR, preventing unnecessary signaling overhead and resource consumption while ensuring that resource allocation remains efficient.
2Speed
If the UE transmits BSR to ensure timely resource allocation for D2D data, then resource allocation responsiveness improves, but transmission delays occur when uplink resources are insufficient
Solution Approach 1:
The patent applies preliminary action by having the eNB proactively allocate uplink resources and cancel triggered ProSe BSRs before the UE needs to transmit them. The eNB anticipates the UE's resource allocation needs and pre-allocates resources, sending cancellation indications to prevent BSR transmissions that would otherwise cause delays. This ensures responsive resource allocation without transmission delays.
3Productivity
If the eNB monitors and manages ProSe BSR cancellation to optimize resource allocation, then resource utilization efficiency improves, but system complexity increases due to additional control signaling
Solution Approach 1:
The patent applies universality by utilizing existing uplink resource allocation mechanisms and control signaling frameworks to manage ProSe BSR cancellation. The eNB integrates BSR cancellation management into its existing resource allocation functions, using the same signaling pathways and control procedures already in place for uplink resource management. This approach optimizes resource utilization while minimizing additional system complexity.
Data Source
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AI summary
A method and apparatus for canceling a triggered proximity-based services (ProSe) buffer status report (BSR) in a wireless communication system is provided. A user equipment (UE) triggers at least one ProSe BSR, and cancels all triggered ProSe BSR if a specific condition is met. The specific condition may be that a device-to-device (D2D) scheduling assignment for a D2D scheduling period can accommodate all pending data available for D2D transmission or that the ProSe BSR is included in a media access control (MAC) protocol data unit (PDU) to be transmitted to a network.