DRX Terminal Active State Management for Uplink Power Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In evolved mobile telecommunication systems, there is a need to minimize power consumption in terminals that stay in a connection state for extended periods, as conventional DRX modes are not optimized for packet services and uplink data transmission, leading to inefficient power usage.
Innovation Solution
A method and apparatus for a terminal to dynamically manage its active and sleep states based on uplink data characteristics, allowing for efficient DRX operation by defining an active state according to uplink data occurrence and informing the network of the DRX operation resumption, using techniques such as ARQ and Hybrid ARQ to determine when to end the active state and resume the DRX mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transitions to active state for uplink data transmission during DRX operation, then the uplink data can be transmitted reliably, but the power consumption increases due to extended active state duration
Solution Approach 1:
The patent applies dynamics by making the active state duration variable rather than fixed. The terminal determines the active state end point dynamically based on whether downlink data is received during the active period. If no downlink data is received, the active state ends earlier than traditionally defined, allowing the terminal to return to sleep state sooner and reduce power consumption while maintaining reliable uplink transmission
Solution Approach 2:
The patent changes the parameter of active state duration based on downlink data reception status. By monitoring whether downlink data is received during the active period and adjusting the active state end point accordingly, the system optimizes the balance between transmission reliability and power consumption
2Reliability
If the terminal maintains active state for HARQ acknowledgment reception, then the uplink transmission reliability is ensured, but the DRX power-saving benefit is reduced
Solution Approach 1:
The patent applies partial action by having the terminal perform HARQ acknowledgment reception only conditionally - specifically, only when downlink data is actually received during the active period. If no downlink data is received, the terminal does not maintain the active state for HARQ acknowledgment, thereby reducing power consumption while still ensuring reliability when needed
3Use of energy by moving object
If the terminal resumes DRX operation immediately after uplink transmission, then power consumption is minimized, but the network may not be aware of the transmission status
Solution Approach 1:
The patent applies feedback by having the terminal monitor the downlink channel during the active state to detect whether downlink data is received. This feedback mechanism allows the terminal to determine the appropriate end point of the active state and resume DRX operation at the optimal time, ensuring both power efficiency and network awareness of transmission status
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for transmitting data by a terminal in a wireless communication system, the method comprising: transmitting, to a base station, a scheduling request for requesting resources for transmitting the data; monitoring a control channel to receive resource allocation information; starting a timer for monitoring the control channel if the resource allocation information is received via the control channel; transmitting, to the base station, the data based on the resource allocation information, and stopping monitoring of the control channel if feedback information corresponding to the data is not received until the timer is expired or a command for stopping the monitoring of the control channel is received from the base station.