Transmission System Sleep State Timing Control
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Solution Overview
Problem
Existing power saving techniques in transmission systems face challenges in balancing power reduction and delay, as they either sacrifice delay for power saving or vice versa, and fail to effectively utilize scheduling information for power reduction.
Innovation Solution
A transmission system that calculates the arrival start timing of data units based on code rate and data transmission block size, allowing the sleep state of signal processors to be ended before data arrival, thereby controlling the transition between sleep and active states to achieve both power saving and low delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transmission apparatus enters a sleep state to save power, then power consumption is reduced, but communication delay increases because the apparatus must wake up before processing arriving traffic
Solution Approach 1:
The transmission apparatus calculates the arrival start timing of data units based on code rate and data transmission block size information received from the communication apparatus. The apparatus ends its sleep state before this calculated arrival timing, ensuring it is ready to process traffic immediately when it arrives. This preliminary action of waking up just in time avoids both excessive delay (by not waking up too early) and missed traffic (by waking up before arrival).
2Use of energy by moving object
If the transmission apparatus uses fixed power saving intervals (LPI), then power saving is achieved, but delay varies and cannot be optimized for different traffic patterns
Solution Approach 1:
Instead of using fixed power saving intervals, the transmission apparatus dynamically adjusts its wake-up timing based on calculated data unit arrival timing. The apparatus receives code rate and data transmission block size information, calculates when data units will arrive, and adapts its sleep/active state transitions accordingly. This dynamic approach allows optimization for different traffic patterns and communication conditions.
3Loss of time
If the transmission apparatus wakes up early to ensure data is processed, then delay is reduced, but power saving effect is diminished
Solution Approach 1:
The transmission apparatus changes the parameter of wake-up timing from fixed/early to calculated/precise. By using code rate and data transmission block size information to calculate the exact arrival start timing of data units, the apparatus determines the optimal moment to end its sleep state. This precise parameter adjustment ensures the apparatus wakes up just in time to process data without unnecessary early waking, thus maintaining both low delay and effective power saving.
Data Source
AI summary
A first transmission apparatus receives a data signal transmitted by a communication apparatus from a lower transmission apparatus sets the received data signal in a data unit, and transmits the data unit. A second transmission apparatus receives the data unit transmitted by the first transmission apparatus. An electric power controller calculates an arrival start timing that is a timing at which the data unit including a data signal transmitted from a communication apparatus starts to arrive at the second transmission apparatus on a basis of a code rate and a size of a data transmission block used when the communication apparatus transmits the data signal, and performs control such that a sleep state of a signal processor that performs processing on the data unit in the second transmission apparatus is ended before the arrival start timing.