eNB Downlink Transmission to Out-of-Coverage Remote UE
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently delivering network access services, particularly mobile terminating traffic, to remote user equipment (UE) that is out of coverage, as they struggle to maintain connected states and manage data transmission effectively in such scenarios.
Innovation Solution
The method involves an evolved Node B (eNB) receiving out-of-coverage-related information on a remote UE, determining to keep both the remote UE and a relay UE in a connected mode, and transmitting downlink data without initiating inactivity timers or performing paging, allowing the remote UE to maintain a connected state even when out of coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the eNB initiates an inactivity timer to switch remote UE and relay UE to idle mode, then power consumption and resource usage are reduced, but downlink data transmission to out-of-coverage remote UE cannot be performed
Solution Approach 1:
The patent dynamically adjusts the connection state of remote UE and relay UE based on coverage status and data transmission requirements. When out-of-coverage information is detected, the system transitions from automatic idle mode (via inactivity timer) to maintaining connected mode, enabling flexible adaptation between power saving and data transmission needs
Solution Approach 2:
The patent changes the state parameter of the connection management by skipping the inactivity timer initiation, thereby keeping the remote UE and relay UE in connected mode. This parameter change enables the system to maintain data transmission capability while accepting higher power consumption during out-of-coverage periods
2Reliability
If the eNB performs paging to relay UE based on downlink data occurrence, then downlink data can be delivered to remote UE, but system complexity and resource overhead increase
Solution Approach 1:
The patent performs preliminary action by maintaining the relay UE in connected mode in advance, before downlink data arrives. This preliminary connection maintenance eliminates the need for paging operations when data needs to be transmitted, reducing system complexity and resource overhead while ensuring reliable data delivery
3Loss of energy
If the remote UE switches to idle mode, then power consumption is reduced, but the UE cannot receive downlink data while out of coverage
Solution Approach 1:
The patent introduces the relay UE as an intermediary that maintains connected mode on behalf of the remote UE. The relay UE acts as a mediator between the eNB and the out-of-coverage remote UE, enabling data reception without requiring the remote UE to maintain high-power connected state directly
Data Source
AI summary
An embodiment of the present invention relates to a method for transmitting downlink data to remote UE, the method for an eNB to transmit downlink data to a remote UE in a wireless communication system comprises a step in which the eNB receives out of coverage related information on the remote UE; a step in which the eNB determines that the relay UE of the remote UE and the remote UE are maintained in a connected mode after receiving the out of coverage related information on the remote UE; and a step of transmitting downlink data to the remote UE.