Wireless Device Carrier Sensing Segmentation Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication devices experience increased power consumption due to packet collisions and repeated retransmissions, particularly in environments where multiple systems use the same frequency band, leading to reduced battery life.
Innovation Solution
A wireless communication device that employs a carrier sensing technique to divide data sequences into preceding and data body components, transmitting the preceding data first to check for channel availability, followed by the data body, and includes mechanisms to avoid contention by canceling data transmission when the channel is busy, thereby reducing communication load and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier sensing is executed frequently to avoid packet collisions, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The data sequence is segmented into preceding data and data body. The device transmits only the preceding data portion when the channel is busy, avoiding transmission of the entire data sequence. This segmentation allows the device to maintain communication reliability by still transmitting some data while reducing power consumption by avoiding full retransmission attempts.
Solution Approach 2:
The device performs partial transmission by sending only the preceding data when collision is detected, rather than attempting to transmit the complete data sequence. This partial action reduces the energy expenditure for retransmission while maintaining some level of communication reliability through the transmitted preceding data.
2Productivity
If the entire data sequence is transmitted when channel is free, then data transmission efficiency is improved, but power consumption increases due to repeated retransmissions when collisions occur
Solution Approach 1:
The data sequence is divided into preceding data and data body. When a collision is detected during transmission, only the preceding data has been consumed, and the data body can be retransmitted without retransmitting the preceding data again. This segmentation improves productivity by reducing redundant retransmission of already successfully transmitted portions.
Solution Approach 2:
When a collision occurs during data transmission, the device discards the remaining data body portion that was not successfully transmitted and recovers by retransmitting only that portion in the future, rather than retransmitting the entire data sequence including the already successfully transmitted preceding data.
3Speed
If data transmission is attempted in busy channels, then communication speed is improved, but packet collisions increase leading to more retransmissions
Solution Approach 1:
The data sequence is segmented into preceding data and data body. The device transmits the preceding data portion even when the channel is busy, allowing communication to proceed at higher speed by not waiting for complete channel clearance, while accepting that some packet collisions may occur but limiting their impact to only the data body portion.
Data Source
AI summary
A data sequence to be transmitted is constituted by a data body and preceding data. The amount of preceding data is smaller than that of data body. If it is determined as a result of executing carrier sensing that a frequency band of radio waves to be transmitted is not being used by another contending communication system, the preceding data is transmitted after the lapse of a predetermined time. If it is determined as a result of executing carrier sensing after completion of transmitting of the preceding data that the frequency band is not being used by another contending communication system, the data body is transmitted after the lapse of a predetermined time. If it is determined that the frequency band is being used, the contention for the frequency band is avoided.