LTE Direct Paging Reception Optimization via D2D Notification
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Solution Overview
Problem
Existing LTE Direct devices consume significant battery power due to continuous monitoring of the Physical Downlink Control Channel (PDCCH) for paging messages, which is necessary for both network and direct paging, leading to reduced battery life.
Innovation Solution
Implementing a method where two LTE Direct devices establish a Device-to-Device (D2D) communication to share paging information, allowing one device to monitor the network channel and notify the other of paging messages through a changed expression code, thereby reducing unnecessary power consumption by discontinuous reception (DRX) and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both devices continuously monitor the network channel for paging messages, then paging reception reliability is improved, but battery power consumption increases
Solution Approach 1:
The patent combines the paging monitoring functions of two D2D devices into a single device. One device (the monitoring device) performs all network paging monitoring, while the other device (the non-monitoring device) relies on notifications from the monitoring device. This merging eliminates redundant monitoring activities and reduces overall power consumption while maintaining reliable paging reception for both devices.
Solution Approach 2:
The monitoring device acts as an intermediary between the network and the non-monitoring device. It receives paging messages from the network, determines whether they are intended for the non-monitoring device, and forwards notifications through D2D communication. This intermediary role allows the non-monitoring device to remain in sleep mode while still receiving paging information reliably.
2Use of energy by moving object
If one device stops monitoring the network channel, then battery power consumption is reduced, but paging notification reliability deteriorates
Solution Approach 1:
The monitoring device implements a feedback mechanism where it continuously monitors the network channel, receives paging messages, determines their intended recipients, and provides timely notifications to the non-monitoring device through D2D communication. This feedback loop ensures that the non-monitoring device receives reliable paging notifications without needing to monitor the network channel itself, thus reducing power consumption while maintaining reliability.
3Duration of action of moving object
If devices use discontinuous reception to save power, then battery life is extended, but paging message detection capability is reduced
Solution Approach 1:
The patent segments the paging monitoring function, assigning it exclusively to one device while the other device focuses on D2D communication and notification reception. This segmentation allows the non-monitoring device to remain in low-power sleep mode during network paging occasions, extending battery life, while the monitoring device maintains full paging detection capability. The functional division ensures that paging message detection capability is preserved at the system level even though individual device monitoring is reduced.
Data Source
AI summary
A method and a wireless network system are provided for paging reception optimization in a first terminal. The method includes establishing, by the first terminal, a Device-to-Device (D2D) communication with a second terminal; receiving, by the first terminal, paging information from the second terminal; receiving, by the first terminal, a paging message from a network; and sending a paging notification to the second terminal upon receiving a paging message for the second terminal.