Long Truncated Buffer Status Report for 5G Logical Channel Groups
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Solution Overview
Problem
In 5G wireless communication systems, the Buffer Status Reporting (BSR) procedure faces ambiguity in selecting logical channel groups (LCGs) for truncated BSRs, especially when LCGs have the same priority, leading to uncertainty for both user equipment (UE) and base stations about which LCGs have data available for transmission.
Innovation Solution
The proposed solution involves generating a long truncated buffer status report that includes a bitmap indicating all LCGs with data in the UE buffer, allowing the base station to determine the number of reported LCGs implicitly from the report length, and prioritizing LCGs based on descending or ascending order of priority or a combination of both to resolve ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If truncated buffer status report is used to reduce reporting overhead, then reporting efficiency is improved, but ambiguity in LCG selection arises when multiple LCGs have the same priority
Solution Approach 1:
The patent segments the LCGs into different groups based on their priority levels. By dividing LCGs into first priority LCGs and second priority LCGs, the system can selectively report buffer status for different priority levels, resolving the ambiguity in truncated reporting while maintaining efficient overhead management.
Solution Approach 2:
The patent introduces dynamic priority ordering where the selection of LCGs for reporting can change based on current network conditions and data availability. The UE can dynamically determine which LCGs to report by considering both priority levels and actual buffer status, making the reporting mechanism adaptive rather than static.
2Loss of information
If all LCGs are reported to provide comprehensive buffer status information, then information completeness is improved, but reporting overhead increases
Solution Approach 1:
The patent applies partial action by reporting buffer status for only the necessary LCGs rather than all LCGs. By selecting LCGs based on priority and data availability criteria, the system provides sufficient information for network control decisions without the excessive overhead of reporting every possible LCG's status.
Solution Approach 2:
The patent applies different reporting qualities to different LCGs based on their importance. High priority LCGs receive detailed buffer status reporting, while lower priority LCGs may receive summarized or selective reporting, allowing comprehensive information where needed while reducing overhead where less critical.
3Loss of information
If priority-based LCG selection is used to resolve ambiguity, then reporting clarity is improved, but complexity in determining priority order increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing priority levels for different LCGs before the actual reporting occurs. The network configures priority orders for LCGs in advance, so that when truncated reporting is needed, the UE can directly use these pre-determined priorities without complex real-time calculations, reducing operational complexity.
Data Source
AI summary
The disclosure relates to a method including determining that buffered data associated with a first sub-set of logical channel groups from a set of logical channel groups is available for transmission; generating a buffer status report, the buffer status report comprising information identifying the first sub-set of logical channel groups from a set of logical channel groups; and, associated with a second sub-set of logical channel groups, information identifying the amount of buffered data available for transmission, the second sub-set of logical channel groups being a proper sub-set of the first sub-set of logical channel groups; and transmitting the buffer status report.