TID-Specific Buffer Status Reporting in Wireless MAC
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Solution Overview
Problem
Conventional buffer status reporting in wireless communication systems lacks granularity and range, failing to provide per-TID information and exceeding maximum reportable buffer sizes, leading to inefficient resource allocation and increased latency.
Innovation Solution
The implementation of TID-specific buffer status reporting using a BSR control field with an ACI bitmap, delta TID parameter, and queue size parameters, along with a QoS control field for increased range, allowing for more accurate and detailed reporting of buffered data sizes, and the generation of aggregated MPDUs with diverse control fields to reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional buffer status reporting is used, then the system is simple to implement, but it lacks granularity and cannot provide per-TID information
Solution Approach 1:
The buffer status reporting is segmented by TID, with each TID having its own buffer status indication. The BSR control field is divided into multiple parts including ACI bitmap, delta TID parameter, and queue size parameters, allowing per-TID reporting while maintaining a structured format that manages complexity.
Solution Approach 2:
Different parts of the BSR control field serve different purposes: the ACI bitmap identifies access categories, the delta TID parameter specifies which TIDs are being reported, and the queue size parameters provide buffer status information. This local differentiation allows precise per-TID reporting without requiring a completely new control field structure.
2Quantity of substance
If conventional buffer status reporting is used, then the control signaling overhead is low, but it exceeds maximum reportable buffer sizes and increases latency
Solution Approach 1:
The patent combines multiple queue size parameters (first queue size parameter and second queue size parameter) within the BSR control field to report larger buffer sizes. By accumulating these parameters, the system can report buffer sizes that exceed the maximum reportable size of conventional single-parameter BSR mechanisms.
Solution Approach 2:
The patent introduces an additional dimension to buffer size reporting by using multiple queue size parameters instead of a single parameter. This multi-dimensional approach allows the system to represent larger buffer sizes by combining the values from multiple parameters, effectively extending the reportable range without requiring a completely different encoding scheme.
3Productivity
If per-TID buffer status reporting is implemented, then resource allocation efficiency improves, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary TID information needed for resource allocation by using the delta TID parameter to indicate specific TIDs of interest. Instead of reporting buffer status for all possible TIDs, the system extracts and reports only those TIDs that require attention, reducing signaling overhead while maintaining resource allocation efficiency.
Solution Approach 2:
The BSR control field structure is designed to be universal and multi-functional: it can report buffer status for one or multiple TIDs depending on the delta TID parameter value, accommodate different access categories through the ACI bitmap, and scale to report larger buffer sizes through parameter accumulation. This universality allows the same control field structure to serve multiple reporting needs without requiring separate mechanisms for each scenario.
Data Source
AI summary
A wireless station may buffer data associated with one or more traffic identifiers (TIDs), and generate a media access control (MAC) protocol data unit (MPDU) including TID-specific buffer status report (BSR) information. A BSR control field may include an Access Category Identifier (ACI) bitmap and a delta TID parameter indicating a mapping of TID-specific buffer status information to a first and second queue size indicated by the BSR. In some cases, the MPDU may also include a quality of service (QoS) control field, and queue sizes indicated by the BSR control field and QoS control field may be accumulated for reporting buffer status for a TID. Additionally or alternatively, a transmitting wireless station may generate an aggregated MPDU (A-MPDU) including multiple MPDUs with different A-control fields based on a receiving a capabilities information field indicating a number of different aggregated control (A-Control) fields the receiving wireless station supports.