LTE Connected Mode Deep Sleep Receiver Activation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in power management and signaling overheads due to the need for continuous receiver activation in LTE networks, particularly in connected mode, which affects battery life and system performance.
Innovation Solution
The introduction of a 'connected mode deep sleep' (CMDS) sub-state in UE devices, where the receiver is only activated during specific sub-frames for wake-up signals, allowing for reduced processing complexity and power consumption, and the use of group wake-up Radio Network Temporary Identifiers (RNTIs) to efficiently manage receiver activation and deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the receiver is continuously activated in connected mode, then the system can respond to data transmissions immediately, but power consumption increases and battery life decreases
Solution Approach 1:
The system dynamically adjusts the receiver activation state based on data arrival conditions. UEs transition between connected mode (receiver active) and connected mode deep sleep sub-state (receiver inactive), optimizing the balance between response speed and power consumption according to real-time network conditions
Solution Approach 2:
The system implements periodic receiver activation through DRX cycles and wake-up signals. Instead of continuous activation, the receiver is activated periodically at scheduled intervals or triggered by wake-up signals, reducing overall power consumption while maintaining system responsiveness
2Productivity
If the receiver is activated frequently to check for wake-up signals, then data transmission responsiveness improves, but processing complexity and power consumption increase
Solution Approach 1:
The network performs preliminary actions by sending wake-up signals before actual data transmission. UEs are notified in advance of upcoming data arrivals, allowing them to activate receivers only when necessary, thereby reducing processing complexity while maintaining high data transmission efficiency
Solution Approach 2:
Wake-up signals serve as intermediary messages between the network and UEs. These intermediate notifications enable UEs to make informed decisions about receiver activation, simplifying the overall system operation by avoiding continuous monitoring and complex activation logic
3Measurement precision
If individual wake-up signals are sent to each UE, then signaling accuracy is high, but signaling overhead increases
Solution Approach 1:
The system merges wake-up signals by grouping multiple UEs into groups and sending a single wake-up signal to the entire group rather than individual signals to each UE. This combining approach maintains adequate signaling accuracy for group-based wake-up while significantly reducing signaling overhead
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
In some implementations, a method for managing a receiver for user equipment in a Long Term Evolution (LTE) system includes receiving, when in a DRX state or sub-state, a message within a Physical Downlink Control Channel (PDCCH) resource region of a first sub-frame. The message is associated with a PDSCH transmission in a second sub-frame different from the first sub-frame. When not in the DRX state or sub-state, a message is received within a Physical Downlink Control Channel (PDCCH) resource region of a first sub-frame. The message associated with a PDSCH transmission in the first sub-frame.