Wireless Terminal Power Saving via Dynamic TTI Control
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP-LTE, terminals consume power by decoding control signals in every Transmission Time Interval (TTI) even if no data is transmitted, leading to inefficient power saving due to limitations in Discontinuous Reception (DRX) mode scheduling and mismatched data allocation properties.
Innovation Solution
Implementing a dynamic power saving mode where terminals decode control signals in the early part of a TTI to determine data presence, allowing for the deactivation of hardware components during data-less intervals, with individual power control of Front End Module (FEM) components and channel estimation methods optimized for faster decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal decodes control signals in every TTI to determine data presence, then the terminal can accurately detect data allocation, but power consumption increases due to continuous hardware operation
Solution Approach 1:
The terminal decodes the control signal in advance (in the early part of TTI) to determine whether data will be transmitted in the latter part of the same TTI. This preliminary detection action enables the terminal to prepare for power saving by deactivating hardware components after decoding the control signal, while still maintaining accurate data allocation detection before the actual data transmission occurs.
2Use of energy by moving object
If DRX mode is implemented with fixed scheduling intervals, then power saving is achieved, but the system cannot respond effectively to dynamically varying data allocation properties
Solution Approach 1:
The patent implements a dynamic power saving mechanism where the terminal adjusts its operational state based on real-time control signal decoding results. Instead of fixed DRX intervals, the terminal dynamically determines whether to activate or deactivate hardware components by decoding the control signal in the early part of each TTI, allowing adaptive response to varying data allocation patterns while maintaining power saving benefits.
3Use of energy by moving object
If the terminal enters sleep mode immediately after decoding control signal, then power saving is maximized, but processing time and performance are impacted
Solution Approach 1:
The TTI is segmented into an early part for control signal decoding and a latter part for data transmission. The terminal decodes the control signal in the early part, makes a power saving decision, and then enters sleep mode for the remainder of the TTI. This temporal segmentation allows the terminal to minimize processing time impact by performing critical decoding operations before the data transmission window closes.
Data Source
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AI summary
An apparatus and a method for controlling power consumption of a terminal in a wireless communication system are provided. The method includes deactivating one or more of hardware components for signal reception in a transmission interval if there is no data to be received in the transmission interval, and receiving a control signal by activating all the components in a next transmission interval.