MAC Allocation Policy for Low-Power UWB Applications
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Solution Overview
Problem
Current wireless MAC protocols face inefficiencies in power-saving performance and overhead due to large delay bounds and fragmented airtime allocation, leading to frequent device wake-ups and incomplete packet transmission in wireless networks.
Innovation Solution
A method and system that categorize application streams into low-latency and high-efficiency categories based on periodic service intervals, allocating medium access time to minimize power loss by spreading slots evenly for low-latency and allocating contiguous slots for high-efficiency categories within a superframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If airtime is allocated in contiguous blocks to meet QoS requirements, then delay bound is reduced, but power-saving performance deteriorates due to frequent wake-ups
Solution Approach 1:
The patent applies dynamics by making the MAS allocation policy adaptable based on application category. The system dynamically switches between contiguous allocation (for low-latency applications) and evenly distributed allocation (for power-saving applications), allowing the allocation strategy to change based on QoS requirements and application type, thus resolving the contradiction between delay bound and power-saving performance
Solution Approach 2:
The patent changes the allocation parameter from fixed contiguous blocks to variable distribution patterns. By introducing the application category parameter and periodically changing the allocation strategy based on this parameter, the system can optimize for either delay bound or power consumption depending on the specific application requirements
2Use of energy by moving object
If airtime is evenly distributed to improve power-saving performance, then power consumption is reduced, but packet transmission reliability deteriorates due to fragmentation
Solution Approach 1:
The system dynamically adjusts the allocation pattern based on application category. For power-saving applications, evenly distributed allocation is used to reduce power consumption, while for low-latency applications, contiguous allocation ensures reliable packet transmission. This dynamic adaptation resolves the contradiction between power consumption and transmission reliability
Solution Approach 2:
Different allocation qualities are applied to different application categories. Power-saving applications receive evenly distributed MAS allocation, while low-latency applications receive contiguous MAS allocation. This local differentiation allows each application type to receive the appropriate allocation strategy for its specific requirements
3Productivity
If contiguous MAS allocation is used for data transmission, then transmission efficiency is improved, but device complexity increases due to wake-up management
Solution Approach 1:
The patent introduces dynamic category-based allocation that automatically selects between contiguous and evenly distributed patterns. This dynamic approach simplifies wake-up management by providing clear allocation rules for each application category, reducing the complexity of managing wake-up schedules while maintaining high transmission efficiency for low-latency applications
Data Source
AI summary
In order that media access slots MAS are allocated based on minimum latency requirements of, for example, not less than 4 ms, or on a medium utilization efficiency or power consumption requirement for a minimum reservation block length, both high-efficiency and low-latency schemes (or category) need to coexist within a superframe with fair support given to both. The maximization of contiguous available MAS between low-latency and high-efficiency schemes ensures that power saving and overhead risk are minimized without compromising the support for low-latency applications.