Stream Classification Service TID Management in Wireless Systems
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Solution Overview
Problem
In wireless communications systems with stream classification service (SCS), receiving stations (STA) struggle to identify and process MAC service data units (MSDU) that are part of SCS streams with quality of service (QoS) requirements, due to multiple SCS streams or non-SCS streams being mapped to the same traffic identifier (TID).
Innovation Solution
The method involves carrying a first descriptor element in a request frame from the STA to the access point (AP) to request an SCS stream, with an indication of whether the STA agrees that the SCS stream and other streams should share a common TID. The AP then responds to this request, allowing for selective assignment of TIDs to ensure proper processing of SCS streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple SCS streams or non-SCS streams are mapped to the same TID, then resource utilization is improved, but the receiving STA cannot identify which MSDU is part of an SCS stream with QoS requirements
Solution Approach 1:
The patent segments the TID space by introducing a stream identifier (SID) as a sub-component within the TID structure. This allows the TID to be divided into multiple fields including a stream identifier field, enabling differentiation of multiple streams while maintaining TID-based resource allocation. The segmentation resolves the contradiction by preserving both resource utilization (through TID mapping) and stream identification (through SID within TID).
Solution Approach 2:
The patent adds an additional dimension to the TID structure by incorporating a stream identifier field within the TID. This dimensional expansion allows the system to maintain the original TID mapping functionality for resource utilization while simultaneously providing stream-level identification capability. The extra dimension enables the receiving STA to identify SCS streams even when multiple streams share the same TID.
2Loss of information
If SCS streams are assigned unique TIDs, then stream identification is improved, but the number of available TIDs is reduced
Solution Approach 1:
The patent segments the TID into multiple fields including a stream identifier field, allowing multiple streams to share a TID while maintaining identification capability through the embedded SID. This segmentation approach reduces the number of unique TIDs needed compared to assigning dedicated TIDs to each stream, thereby reducing TID management complexity while preserving stream identification.
Solution Approach 2:
The TID structure is designed to serve multiple functions simultaneously: resource allocation, stream identification, and QoS management. By making the TID multi-functional through the inclusion of the stream identifier field, the system eliminates the need for separate identification mechanisms, reducing overall device complexity while maintaining stream distinguishability.
3Productivity
If SCS streams share TIDs with non-SCS streams, then resource efficiency is improved, but QoS requirements cannot be met
Solution Approach 1:
The patent segments the TID to include a stream identifier field that enables the receiving STA to distinguish SCS streams from non-SCS streams even when they share the same TID. This segmentation allows differential processing where SCS streams receive appropriate QoS handling while maintaining resource sharing, thus preserving both resource efficiency and QoS reliability.
Solution Approach 2:
The patent applies local quality by enabling different processing policies for different streams within the same TID. The receiving STA can apply QoS-specific receiving policies to SCS streams identified through the stream identifier field, while non-SCS streams receive standard processing. This localized differentiation maintains resource efficiency through sharing while ensuring QoS requirements are met for specific streams.
Data Source
AI summary
A method of traffic flow management with stream classification service (SCS) and associated apparatus are provided, where the wireless communications system may include a first device and a second device. The method may include: carrying and sending a first descriptor element in a first request frame, requesting for a SCS stream from the first device, wherein the first descriptor element is related to the SCS, wherein the first request frame includes a first indication, indicating whether the second device agrees that the SCS stream and any other stream from the first device to the second device share a same traffic identifier (TID).