Stub Signal Access Point Wireless Network Collision
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Solution Overview
Problem
Current wireless communication systems, such as those based on the IEEE 802.11 protocol, face issues with unreliable network medium access due to interference and misdecoded packet durations, leading to unsuccessful transmissions and synchronization problems as the number of devices increases.
Innovation Solution
The implementation of an access point and station apparatus with a communication circuit and processing circuit that uses a stub signal for data transmission signaling, without duration information, and a transmission polling signal to regulate access, allowing stations to transmit within permitted time periods, reducing power dissipation and collision occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to ensure all stations decode the duration field successfully, then decoding reliability is improved, but energy consumption increases and interference to other transmissions worsens
Solution Approach 1:
The patent extracts the duration information from the data packet payload and places it in a separate dedicated field in the physical layer header. This allows stations to decode the duration field independently using lower power requirements, while the actual data packet can be transmitted at lower power levels without requiring all stations to decode the entire packet to obtain duration information.
Solution Approach 2:
The patent segments the packet structure into distinct components: a preamble containing the duration field, and a separate data payload. This segmentation allows receivers to process only the critical duration information from the preamble without needing to decode the entire packet, reducing the energy required for reliable decoding.
2Reliability
If transmit power is increased to ensure all stations decode the duration field successfully, then decoding reliability is improved, but interference to other transmissions worsens
Solution Approach 1:
The duration information is extracted and placed in the physical layer preamble, allowing it to be decoded with minimal transmit power. The actual data transmission can then proceed at lower power levels, reducing interference to other transmissions while maintaining reliable duration decoding for network synchronization.
3Productivity
If more stations transmit simultaneously in the same area, then network capacity and utilization are improved, but collision probability and synchronization drift increase
Solution Approach 1:
The patent implements a feedback mechanism where the access point monitors the stub signals from multiple stations, determines appropriate transmission time periods for each station, and provides feedback through polling signals. This coordinated feedback system allows multiple stations to transmit simultaneously without collisions, maintaining synchronization accuracy while increasing network capacity.
Solution Approach 2:
The patent uses preliminary action by having stations send stub signals before actual data transmission. The access point processes these stub signals in advance, determines the optimal transmission time periods, and provides scheduling information to stations before they begin data transmission. This preliminary coordination enables multiple stations to transmit simultaneously without collisions.
4Device complexity
If traditional packet duration signaling is used where each station independently decodes duration, then protocol simplicity is maintained, but synchronization drift and transmission errors increase in dense networks
Solution Approach 1:
The patent introduces an intermediary role for the access point that collects stub signals from multiple stations, determines appropriate transmission time periods, and provides coordinated polling signals back to stations. This intermediary coordination mechanism maintains protocol simplicity at the station level while significantly improving synchronization reliability in dense networks through centralized management.
Data Source
AI summary
The present disclosure discloses a wireless communication system having reliable network medium access mechanism that includes a station apparatus and an access point apparatus. The station apparatus is arranged to transmit a stub signal for signaling a data transmission to be performed, wherein the stub signal does not include information of the data transmission. The access point apparatus is arranged to receive the stub signal and transmit a transmission polling signal for signaling a permitted time period so as to permit the station apparatus to perform the data transmission in the permitted time period.