Buffer Status Reporting in Dual Connectivity Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in efficiently calculating and reporting buffer status across dual connectivity scenarios, where UE needs to manage data transmission effectively between multiple base stations with non-ideal backhaul interfaces, leading to potential stalls due to delayed UL grants.
Innovation Solution
Implementing a method where the UE reports a first amount of Data Available for Transmission (DAT) to the first BS, starts a timer, and triggers a reporting for a second amount of DAT if no UL grant is received from the first BS within the timer duration, allowing adaptive buffer status calculation and reporting to both BSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE reports buffer status to the first BS and waits for UL grant, then the scheduling control is maintained, but the transmission efficiency deteriorates due to stall situations when UL grant is delayed
Solution Approach 1:
The UE performs preliminary action by reporting buffer status to the second BS before the first BS can provide UL grant. This proactive reporting ensures that the second BS is prepared to provide UL grant promptly when the first BS fails to respond, thereby preventing transmission stalls and maintaining productivity while preserving scheduling control through the primary BS.
2Stability of the object's composition
If the UE waits for UL grant from the first BS, then the centralized scheduling is maintained, but the buffer status reporting efficiency deteriorates due to delayed responses from the first BS
Solution Approach 1:
The second BS acts as an intermediary in the scheduling process. When the first BS fails to provide timely UL grant, the UE can obtain UL grant from the second BS which has been informed of the buffer status. This intermediary approach maintains the overall centralized scheduling structure while reducing reporting delays by providing an alternative path for grant acquisition.
3Productivity
If the UE reports buffer status to both BSs, then the transmission opportunity is improved, but the signaling overhead increases
Solution Approach 1:
The UE applies local quality by selectively reporting buffer status based on the specific situation. The buffer status is reported to the second BS only when the first BS fails to provide UL grant within a certain time period. This conditional reporting approach improves transmission opportunities by ensuring backup reporting capability while minimizing signaling overhead by avoiding redundant reports to both BSs simultaneously.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for calculating and reporting a buffer status in the wireless communication system, the method comprising: reporting a first amount of Data Available for Transmission (DAT) to the first BS; starting a timer for the first BS when the amount of DAT is reported to the first BS; and triggering a reporting for a second amount of DAT if the UL grant is not received from the first BS during run time of the timer for the first BS.