ISO-Zone Superframe Allocation for Wireless QoS
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Solution Overview
Problem
Current wireless MAC protocols face challenges in efficiently allocating airtime to meet the quality-of-service (QoS) requirements, particularly in ensuring low latency and power efficiency, as large contiguous blocks of airtime can lead to delays and smaller fragmented allocations may not fully transmit packets.
Innovation Solution
The method organizes a superframe into allocation zones and iso-zones, generates an allocation map, and determines a periodic service interval based on Traffic Specifications (TSPEC) and delay requirements, searching for transmission opportunities to accommodate medium time requirements, thereby optimizing airtime allocation and minimizing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If large contiguous blocks of airtime are allocated for data transmission, then power efficiency is improved, but delay requirements of other applications are not met
Solution Approach 1:
The patent segments the superframe into multiple allocation zones (first allocation zone, second allocation zone, etc.) with different characteristics. The first allocation zone provides contiguous airtime blocks for power efficiency, while the second allocation zone provides smaller time slots for low-latency applications. This segmentation allows simultaneous satisfaction of both power efficiency and delay requirements by directing different traffic types to different zones.
Solution Approach 2:
Different allocation zones are assigned different quality characteristics tailored to specific application needs. The first allocation zone has characteristics optimized for power efficiency (contiguous time), while the second allocation zone has characteristics optimized for low latency (distributed slots). This local quality differentiation allows each zone to serve its intended purpose effectively.
2Loss of time
If smaller distributed fragments of time allocation are used, then delay requirements are met, but successful transmission of entire packets is not enabled
Solution Approach 1:
The patent creates multiple allocation zones where the second allocation zone provides smaller distributed time slots that can be aggregated to form sufficient transmission time for entire packets. By segmenting the time allocation into multiple zones with different granularities, the system can meet delay requirements through smaller slots while ensuring packet transmission success through aggregation across zones.
3Reliability
If airtime is allocated based on QoS requirements, then quality of service is improved, but complexity of allocation management increases
Solution Approach 1:
The patent segments the complex QoS allocation problem into multiple allocation zones, each with simplified allocation rules. The first allocation zone handles power efficiency requirements with contiguous time blocks, while the second allocation zone handles latency requirements with distributed slots. This segmentation simplifies the management complexity by dividing the allocation task into more manageable, rule-based zones rather than requiring complex centralized optimization.
Data Source
AI summary
Allocation of contiguous blocks of airtime for data or airtime transmission can lead to large maximum service intervals for an application stream. This may result in a large delay bound where large blocks of contiguous MAS blocks other applications from meeting their low-latency requirements. A method and network that overcomes at least the shortcomings of known methods includes transmitting information over a wireless network. This includes the steps of: organizing the superframe into allocation zones; organizing the allocation zones into iso-zones; generating an allocation map; determining a periodic service interval and medium time based on a TSPEC, a delay requirement, and local resource of an application stream; searching for transmission opportunity that accommodates the periodic service interval and the medium time required based on the allocation map; transmitting information in the superframe upon finding transmission opportunity in the searching step.