Extended DRX Uplink Indication for MTC Power Reduction
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Solution Overview
Problem
Current discontinuous reception (DRX) and power saving mode (PSM) techniques in LTE are insufficient for reducing power consumption in machine-type communication (MTC) devices, which require longer and more flexible DRX cycles to accommodate infrequent small burst transmissions, leading to increased battery drain and operational costs.
Innovation Solution
The implementation of an extended discontinuous reception (eDRX) operation based on an uplink indication, where user equipment (UE) transmits an eDRX indication to the network, allowing for extended DRX cycles beyond the conventional 2.56 seconds, enabling more significant battery savings and flexible power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional DRX with 2.56 second cycle is used, then network compatibility is maintained, but power consumption is high for MTC devices with infrequent transmissions
Solution Approach 1:
The patent implements dynamic DRX cycle adjustment by introducing extended DRX cycles (eDRX) that can be configured based on UE activity patterns and network conditions. The eDRX mechanism allows the DRX cycle to be dynamically extended beyond the conventional 2.56 seconds, enabling MTC devices to adapt their reception behavior to match their infrequent transmission patterns, thereby significantly reducing power consumption while maintaining network compatibility through standardized signaling procedures.
Solution Approach 2:
The patent changes the DRX cycle parameter from the fixed conventional value to an extended configurable range. By introducing eDRX with configurable cycle lengths adapted to MTC traffic patterns, the system allows MTC devices to operate with longer intervals between active reception periods, directly addressing the high power consumption issue of conventional DRX for infrequent transmissions while maintaining compatibility through standardized parameter signaling.
2Duration of action of stationary object
If extended DRX cycles are implemented, then battery life is extended, but network signaling complexity increases
Solution Approach 1:
The patent implements a universal eDRX mechanism that serves multiple functions: it extends battery life for MTC devices, maintains network compatibility through standardized signaling, and provides flexible adaptation to different MTC traffic patterns. The same eDRX framework can be applied across various MTC scenarios with different activity patterns, eliminating the need for device-specific customizations and reducing overall network signaling complexity through a unified approach.
Solution Approach 2:
The patent employs preliminary configuration of eDRX parameters through network signaling before the UE enters extended DRX operation. By pre-configuring the eDRX cycle length and parameters through standardized RRC signaling, the network prepares the UE for extended DRX operation in advance, avoiding the need for frequent dynamic reconfiguration and reducing signaling complexity during actual eDRX operation. This preliminary setup enables long battery life while keeping ongoing signaling minimal.
3Use of energy by moving object
If DRX is used to reduce power consumption, then battery savings are achieved, but responsiveness to incoming data is reduced
Solution Approach 1:
The patent implements dynamic adaptation of DRX cycle length based on UE activity patterns and network conditions. The eDRX mechanism allows the system to switch between shorter DRX cycles when data activity is expected and longer cycles when the UE is inactive, thereby maintaining responsiveness to incoming data while maximizing battery savings during periods of low activity. This dynamic behavior resolves the contradiction between power savings and responsiveness by adapting to actual traffic conditions.
Data Source
AI summary
A method and apparatus for transmitting an uplink indication for extended discontinuous reception (eDRX) in a wireless communication system is provided. A user equipment (UE) detects that an event related to eDRX occurs, and transmits an uplink indication related to eDRX to a network. When the event related to eDRX is that an eDRX timer expires or an eDRX command indicating stop of eDRX is received, the uplink indication may indicate stop of eDRX. When the event related to eDRX is that no uplink data is to be transmitted, the uplink indication may indicate start of eDRX.