D2D Discovery State Switching for Power Reduction
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Solution Overview
Problem
Device-to-device (D2D) communication devices consume excessive power due to continuous listening for discovery information, even when not needed, leading to reduced standby time and increased power consumption.
Innovation Solution
An upper layer of the RRC layer sends instructions to switch the D2D communication device from a sleep state to a listening state only when D2D communication is required, allowing timely discovery information reception while minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the D2D communication device continuously listens for discovery information, then the device can timely receive discovery information, but the power consumption increases and standby time decreases
Solution Approach 1:
The patent implements periodic listening by configuring the device to switch between sleep state and listening state at predetermined intervals. The listening state is activated only during specific discovery subframes when discovery information is expected to be transmitted, rather than continuous monitoring. This periodic action reduces power consumption while ensuring timely reception of discovery information when it is actually available.
2Use of energy by moving object
If the D2D communication device switches to listening state only when needed, then power consumption is reduced, but the device must accurately determine when to activate listening to ensure timely discovery information reception
Solution Approach 1:
The patent applies preliminary action by pre-configuring the device with discovery resource information, including timing information about when discovery information will be transmitted. The upper layer (RRC layer) provides instructions to the physical layer in advance about when to switch to listening state, based on predetermined discovery subframe configurations. This allows the device to activate listening state only at the appropriate times without requiring complex real-time decision-making, thus reducing control complexity while maintaining power efficiency.
Data Source
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AI summary
Embodiments of the present invention provide a method for receiving D2D discovery information and an apparatus. The method for receiving D2D discovery information includes: sending, by an upper layer of a radio resource control RRC layer of a D2D communication device, a first instruction to a physical layer of the D2D communication device, where the first instruction is used to instruct the physical layer to switch from a D2D sleep state to a D2D listening state; and receiving, by the physical layer of the D2D communication device, the first instruction and switching from the D2D sleep state to the D2D listening state according to the first instruction, to listen to D2D discovery information. According to the embodiments of the present invention, the upper layer of the RRC layer of the D2D communication device sends the first instruction to the physical layer of the D2D communication device, and the physical layer of the D2D communication device receives the first instruction and switches from the D2D sleep state to the D2D listening state according to the first instruction, to listen to D2D discovery information. This reduces power consumption of the D2D communication device and prolongs a standby time of the D2D communication device.