Relay Terminal Wake-Up for ProSe Data Transmission
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Solution Overview
Problem
In the context of ProSe (Proximity-based Services) in mobile communication systems, data transmission from a wearable terminal to a network is hindered when the relay terminal transitions to an RRC idle state, causing disconnection and preventing data relay.
Innovation Solution
A radio terminal is configured to notify the network of its relay status, forward data addressed to another terminal, and re-establish connections upon receiving messages indicating data availability, ensuring continuous data transmission even when part of the connection is released.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the relay terminal transitions to RRC idle state to save energy, then energy consumption is reduced, but data transmission reliability deteriorates
Solution Approach 1:
The network side performs preliminary actions by storing the mapping relationship between the wearable terminal and relay terminal before the relay terminal transitions to idle state. When data arrives for the wearable terminal, the network can directly identify the sleeping relay terminal and send wake-up notifications, eliminating the need for the relay terminal to maintain continuous connection for data reception.
Solution Approach 2:
The network introduces an intermediary mechanism (message notification system) that bridges the gap between data arrival and relay terminal wake-up. The network sends a first message to the sleeping relay terminal containing the second message for the wearable terminal, enabling indirect communication without requiring the relay terminal to be in connected state.
2Reliability
If the relay terminal maintains continuous connection to ensure data transmission, then data transmission reliability is improved, but energy consumption increases
Solution Approach 1:
Instead of maintaining continuous connection, the relay terminal adopts periodic wake-up based on network-initiated notifications. The terminal sleeps most of the time and wakes up only when the network sends a wake-up message, converting continuous energy consumption into periodic, controlled activation.
Solution Approach 2:
The network automatically manages the relay terminal's wake-up scheduling by sending notifications when data arrives for wearable terminals. The relay terminal doesn't need to actively maintain connection or poll for data, but rather responds to network-initiated wake-up calls, reducing its active transmission time.
3Productivity
If the connection is released to enable idle state transitions, then energy efficiency is improved, but data forwarding capability deteriorates
Solution Approach 1:
The network maintains feedback capability by storing the mapping relationship between wearable terminals and relay terminals. Even when the relay terminal is in idle state, the network can receive data for the wearable terminal, generate appropriate wake-up messages, and forward them to the correct relay terminal, ensuring continuous operational capability.
Solution Approach 2:
The system performs preliminary setup by establishing and storing the mapping relationship between wearable terminals and relay terminals before data transmission begins. This preliminary action enables the network to quickly identify and notify the correct relay terminal when data arrives, without requiring the relay terminal to be in connected state.
Data Source
AI summary
A radio terminal according to one embodiment is configured to perform a relay between another radio terminal and a network. The radio terminal comprises: a transmitter configured to notify the network of first information indicating that the radio terminal is a relay terminal of the another radio terminal; a controller configured to forward data addressed to the another radio terminal to the another radio terminal via a connection between the another radio terminal through the radio terminal and the network; and a receiver configured to receive from the network a message indicating that the data addressed to the another radio terminal exists when at least part of the connection is released. The controller is configured to start control for establishing the connection in order to forward the data addressed to the another radio terminal in response to receiving the message.