UE Initiated C-DRX Command for Power Savings
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing power consumption, especially in devices with limited power sources like IoT and wearable devices, due to the need for continuous signal monitoring and data transmission.
Innovation Solution
The implementation of user equipment (UE) initiated connected discontinuous reception (C-DRX) commands allows devices to enter a low power state early during C-DRX cycles, reducing power consumption by prolonging the low power state for multiple future C-DRX cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous signal monitoring and data transmission are performed in wireless communication systems, then communication reliability and data transmission are improved, but power consumption increases
Solution Approach 1:
The patent implements connected discontinuous reception (C-DRX) mode where the UE periodically switches between active monitoring states and low-power sleep states. The network entity configures DRX parameters including on-duration timer, inactivity timer, and drx-HARQ-RTT-TimerDL to define periodic cycles of active reception followed by sleep periods, reducing power consumption while maintaining communication reliability through scheduled wake-ups for potential data reception.
Solution Approach 2:
The patent applies preliminary action by having the UE transmit a C-DRX command message before the on-duration timer expires, proactively requesting early transition to sleep mode. The network entity receives this advance notification and can prepare for the upcoming low-power state, allowing the UE to enter sleep mode earlier than the configured timer would normally permit, thus reducing power consumption while the network maintains readiness for potential data arrivals.
2Use of energy by moving object
If UE enters low power state early during C-DRX cycle, then power consumption is reduced, but signal monitoring capability deteriorates
Solution Approach 1:
The patent implements feedback through the C-DRX command message exchange mechanism. The UE monitors downlink data and provides feedback to the network entity by transmitting the C-DRX command when it determines early sleep transition is appropriate. The network entity receives this feedback and can adjust its scheduling decisions, ensuring that signal monitoring capability is maintained when needed while allowing early sleep transitions when the downlink buffer is empty, thus balancing power consumption with monitoring capability.
3Use of energy by moving object
If UE remains in low power state for multiple future C-DRX cycles, then power savings are increased, but response time to incoming data increases
Solution Approach 1:
The patent applies dynamics by making the C-DRX cycle duration and sleep state duration adjustable and adaptive. The network entity configures dynamic parameters including drx-SlotOffset, on-duration timer values, and inactivity timer values that can be modified based on traffic patterns. When data arrives during a sleep period, the UE can be quickly awakened with minimal latency, and the DRX parameters can be dynamically adjusted to optimize the balance between power savings and response time based on actual communication needs.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for user equipment (UE) initiated enhanced connected discontinuous reception (C-DRX) commands. An example method, performed at a user equipment (UE), generally includes receiving first signaling configuring the UE for an enhanced connected discontinuous reception (C-DRX) mode, and transmitting a request for the UE to enter a low power state during a current C-DRX cycle prior to expiration of at least one of an on duration timer or inactivity timer, wherein the request proposes the UE remain in the low power state for a first number of one or more future C-DRX cycles.