Buffer Status Reporting in Mobile Communication Systems
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Solution Overview
Problem
Current LTE systems face inefficiencies in buffer status reporting, leading to unnecessary dynamic grants and resource wastage, especially when dealing with semi-persistently scheduled radio bearers.
Innovation Solution
A new buffer status reporting scheme that takes into account the scheduling mode of each radio bearer, triggering reports only when certain criteria are met, and optimizing resource usage by differentiating between dynamic and semi-persistent scheduling modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If buffer status reports are triggered for all radio bearers regardless of scheduling mode, then comprehensive buffer status information is provided, but unnecessary dynamic grants are generated and resources are wasted
Solution Approach 1:
The patent applies local quality by differentiating the buffer status reporting behavior based on the scheduling mode of each individual radio bearer. For semi-persistently scheduled bearers, BSRs are suppressed when data is present, while for dynamically scheduled bearers, traditional BSR triggering applies. This localized differentiation eliminates unnecessary reporting for semi-persistent bearers while maintaining comprehensive information for dynamic bearers.
Solution Approach 2:
The patent implements dynamics by making the BSR triggering mechanism adaptive to the scheduling mode. The reporting behavior dynamically adjusts based on whether the radio bearer is configured for semi-persistent or dynamic scheduling, allowing the system to optimize resource usage while maintaining necessary information flow according to current operational modes.
2Reliability
If buffer status reports include data from semi-persistently scheduled radio bearers, then the scheduler has complete information for resource allocation, but unnecessary dynamic grants are allocated causing resource wastage
Solution Approach 1:
The patent extracts semi-persistently scheduled radio bearers from the buffer status reporting process. When a radio bearer is configured for semi-persistent scheduling and data is present, the BSR is not triggered for that bearer. This extraction prevents the scheduler from generating unnecessary dynamic grants while maintaining reliable scheduling decisions through alternative mechanisms.
Solution Approach 2:
The patent segments the buffer status reporting mechanism by scheduling mode. It divides radio bearers into two categories: semi-persistently scheduled bearers (where BSR is suppressed when data is present) and dynamically scheduled bearers (where traditional BSR triggering applies). This segmentation allows optimized handling of each category according to its specific requirements.
3Device complexity
If traditional buffer status reporting is used without considering scheduling mode, then implementation is simple, but resource allocation efficiency deteriorates due to unnecessary dynamic grants
Solution Approach 1:
The patent introduces dynamic adaptation of the BSR triggering mechanism based on scheduling mode configuration. The system automatically adjusts reporting behavior according to whether each radio bearer uses semi-persistent or dynamic scheduling, achieving high resource allocation efficiency without requiring complex manual configuration or intervention.
Data Source
AI summary
An invention relates to methods for transmitting a buffer status report (BSR) in a mobile communication system, more particularly to the definition of rules for triggering, generating and transmitting BSRs. The invention also relates to a data transmission method utilizing new rules to decide data of which radio bearers is transmitted within a given transmission time interval. Moreover, the invention relates to scheduling method for radio resources that is taking into account additional scheduling-relevant information from the buffer status reporting and/or data transmission method. To avoid unnecessary grants from the network and to suggest an advanced handling of data transmissions the invention suggests a buffer status reporting and data transmission schemes that take into account the scheduling mode of data of radio bearers pending for transmission to decide whether to report on it in a buffer status report, respectively, whether to multiplex the data to a transport block for transmission.