Adaptive Packet Transmission Time Indication in Restricted Access Windows
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Solution Overview
Problem
The IEEE 802.11ah protocol faces inefficiencies due to high overhead and the hidden node problem, particularly in large coverage areas with numerous associated stations, where implicit packet transmission time indication techniques result in fixed and often underutilized or overextended transmission durations, leading to channel inefficiency.
Innovation Solution
A system and method that utilize restricted access windows (RAWs) with adaptive packet transmission time indication techniques, allowing stations to determine if explicit or implicit indications are needed based on resource allocation requirements, enabling flexible adjustment of transmission times and durations to match varying data exchange needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If implicit packet transmission time indication techniques are used in RAW, then signaling overhead is reduced, but transmission durations become fixed and often underutilized or overextended leading to channel inefficiency
Solution Approach 1:
The patent applies dynamics by making the packet transmission time indication adaptive rather than fixed. The access point dynamically selects between implicit and explicit indication techniques based on the station's data buffer status and transmission requirements, allowing transmission durations to flexibly match actual data exchange needs rather than being constrained to predetermined fixed intervals
Solution Approach 2:
The patent changes the parameter of transmission time indication from a fixed implicit value to a variable that can switch between implicit and explicit modes. This parameter change allows the system to adapt transmission durations to actual data requirements, preventing both underutilization and overextension of channel resources
2Productivity
If explicit packet transmission time indication techniques are used in RAW, then transmission durations can be optimized for data exchange needs, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing explicit packet transmission time indication only to specific stations that require it, rather than universally to all stations. The access point selectively sends explicit indications to stations with non-standard transmission requirements, while other stations continue using implicit indications, thereby optimizing channel efficiency for those who need it while minimizing overall signaling overhead
Solution Approach 2:
The patent uses partial action by applying explicit indication techniques only when necessary for specific stations rather than to all stations. This selective approach provides the optimization benefits of explicit timing where needed while avoiding the excessive signaling overhead that would result from universal explicit indication
3Device complexity
If fixed transmission durations are used in RAW, then protocol complexity is reduced, but resource utilization becomes inefficient due to underutilization or overextension
Solution Approach 1:
The patent resolves this contradiction by introducing dynamic adaptation at the access point level. While the basic protocol structure remains simple and fixed, the access point dynamically adjusts transmission time indications on a per-station basis, allowing resource utilization to be optimized without significantly increasing overall protocol complexity
Solution Approach 2:
The patent applies self-service by allowing each station to indicate its data buffer status and transmission requirements, and the access point to autonomously determine the appropriate indication technique. This self-service mechanism enables adaptive resource allocation without requiring complex centralized control or increasing protocol complexity
Data Source
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AI summary
A method for exchanging data includes generating a usage indicator for an access window, the usage indicator including a first indication of if an allowed station in a list of allowed stations needs to receive information about its resource allocation and at least one of a second indication of a start time of the access window, and a third indication of the list of allowed stations, and broadcasting the usage indicator. The method also includes exchanging data with at least one of the allowed stations within the access window in accordance with the usage indicator.