Uplink Buffer Status Reporting in Multiflow Wireless Networks
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Solution Overview
Problem
Wireless communication networks face challenges in managing uplink data flow and reporting in multiflow operations, particularly in dynamically controlling data flow and prioritizing logical channels across multiple network nodes with varying quality of service requirements.
Innovation Solution
The implementation of bearer level splitting and packet level splitting techniques for uplink reporting, where user equipment (UE) associates logical channel groups with nodes for independent reporting or groups buffers into a common pool for unified reporting, using scaling coefficients to optimize data transmission based on available data and network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bearer level splitting is used for uplink reporting, then uplink flow control is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the uplink reporting process into bearer-level segments. Each bearer is assigned to specific logical channel groups (LCGs), and BSR reports are generated separately for each bearer based on its specific buffer status. This segmentation enables independent flow control for each bearer, improving uplink flow control performance while managing complexity through structured organization.
2Productivity
If packet level splitting is used for uplink reporting, then reporting efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation at the packet level by dividing the buffer status reporting into packet-level units. Each packet or group of packets is tracked individually, and BSR reports are generated based on packet-level buffer status. This enables more granular and efficient reporting, allowing the system to report only when necessary and at the appropriate level of detail, thereby improving reporting efficiency.
3Measurement precision
If multiple BSR reports are generated for multiple component carriers, then uplink reporting accuracy is improved, but overhead increases
Solution Approach 1:
The patent applies partial action by generating BSR reports selectively rather than continuously for all component carriers. Reports are generated only when buffer status changes meet certain thresholds or when specific triggering conditions are met. This partial reporting approach maintains accurate buffer status information where needed while reducing overall reporting overhead by avoiding redundant reports.
Solution Approach 2:
The patent changes the parameter of reporting frequency and granularity based on buffer status conditions. When buffer status is stable, reporting frequency is reduced; when buffer status changes significantly, reporting frequency increases. This dynamic parameter adjustment allows the system to maintain high reporting accuracy when necessary while minimizing overhead during stable conditions.
4Adaptability or versatility
If logical channel groups are associated with multiple nodes, then adaptability is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies segmentation by associating specific logical channel groups with specific nodes rather than allowing arbitrary many-to-many associations. Each LCG is mapped to one or more designated nodes, creating a structured and manageable association pattern. This segmentation simplifies the detection and measurement of buffer status by establishing clear relationships between LCGs and nodes, reducing the complexity of tracking buffer status across multiple associations.
Data Source
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AI summary
Uplink reporting and logical channel prioritization in multiflow operation is described. In some embodiments, uplink reporting for multiflow operation utilizes bearer level splitting where the UE associates bearers or logical channel groups (LCGs) with cells for uplink reporting. In some embodiments, uplink reporting for multiflow operation utilizes packet level splitting where the UE groups buffers for all LCGs into a common pool for uplink reporting. In packet level splitting embodiments, the UE may perform uplink reporting based on the total amount of data available for transmission in the common buffer pool or by applying scaling coefficients associated with the serving cells. Some embodiments manage mapping of logical channel payloads to uplink grants for multiflow operation.