Relay Paging Signal Coordination for Low-Power D2D Devices
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Solution Overview
Problem
In device-to-device communication scenarios, there is a need for an efficient method to page low-capability devices, such as wearable devices, which are connected to high-capability devices like smartphones, as existing paging methods require frequent decoding of control channels, consuming power and resources, and do not effectively address the need to page multiple devices simultaneously.
Innovation Solution
A method where a first device determines and sends a second paging signal to page multiple second devices, using a synchronization signal to coordinate paging cycles, allowing the second devices to determine if they are paged without frequent decoding, thereby conserving power and resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second device frequently decodes the paging control channel to check for paging messages, then the paging reliability is improved, but the power consumption and resource usage increase
Solution Approach 1:
The paging signal is segmented into two parts: a first paging signal sent by the network side device, and a second paging signal sent by the first device. This segmentation allows the second device to receive paging information through multiple paths, improving reliability while allowing the device to sleep longer between wake cycles, thus reducing power consumption.
Solution Approach 2:
The first device receives the first paging signal from the network side device before forwarding it to the second device. This preliminary action ensures that the second device is paged through a relay that has already validated the paging necessity, reducing unnecessary paging wake-ups and saving power.
2Productivity
If the network side device pages the second device directly, then the paging efficiency is improved, but the device complexity and resource requirements increase
Solution Approach 1:
The first device acts as an intermediary between the network side device and the second device for paging operations. The first device receives the first paging signal from the network, determines the need to page the second device, sends the second paging signal, and receives the response. This intermediary approach simplifies the overall system architecture compared to direct network-to-second-device paging while maintaining efficiency.
3Quantity of substance
If the first device pages multiple second devices simultaneously, then the paging capacity is improved, but the signal interference and detection difficulty increase
Solution Approach 1:
Each second device is assigned a dedicated second paging signal with unique characteristics (different sequences, time slots, or frequency resources). This local differentiation allows multiple devices to be paged simultaneously without interference, as each device can independently detect its specific paging signal among others.
Data Source
AI summary
The present disclosure provides example paging methods, synchronization methods, and user equipment. In one example paging method, a first device determines second paging signals used to page second devices and sends the second paging signals to the second devices connected to the first device. The second devices determine, according to the second paging signals, whether the second devices are paged second devices, so that the first device or a network side device pages the second devices.