Passive UE Data Transmission via Relay Polling
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing uplink data transmission from low-energy and power-constrained wireless devices, particularly passive IoT devices that rely on radio-frequency energy harvesting, as they require optimized system overhead and efficient energy conservation.
Innovation Solution
A method involving a relay device that polls the passive UE for data transmission, allowing the UE to send a Non-Access Stratum (NAS) message with a temporary ID, which is forwarded by the relay device to the wireless network without establishing active PDU sessions, thus conserving energy and reducing system overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive UEs transmit uplink data using traditional methods, then data transmission can be achieved, but energy consumption increases and system overhead increases
Solution Approach 1:
The patent introduces a relay device as an intermediary between the passive UE and the network. The relay device receives poll messages from the network, retrieves stored data from the passive UE, and forwards it to the network. This eliminates the need for the passive UE to actively transmit data, significantly reducing its energy consumption while maintaining data transmission functionality.
Solution Approach 2:
The patent implements preliminary action by having the relay device store data from the passive UE in advance. When the network sends a poll message, the relay device can immediately retrieve and forward the pre-stored data without requiring the passive UE to be actively powered on or transmit new data, thus reducing energy consumption while ensuring timely data delivery.
2Reliability
If passive UEs establish active PDU sessions for data transmission, then reliable communication is achieved, but device complexity and power consumption increase
Solution Approach 1:
The relay device serves as an intermediary that manages the complexity of communication sessions. It maintains the PDU session with the network and handles data retrieval from the passive UE, thereby simplifying the passive UE's role to mere data storage and eliminating the need for it to manage complex session states, reducing both device complexity and power consumption while maintaining communication reliability.
3Loss of time
If passive UEs continuously monitor for transmission opportunities, then data can be sent promptly, but energy consumption increases
Solution Approach 1:
The patent implements periodic action through the network's poll messages that periodically query the relay device for data from passive UEs. This eliminates the need for passive UEs to continuously monitor for transmission opportunities, as the relay device handles the periodic communication on their behalf, significantly reducing energy consumption while maintaining timely data transmission through the polling mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient uplink data transmission from passive UEs by leveraging radio-frequency energy harvesting, reducing the need for active PDU sessions and maintaining network connectivity with minimal power consumption.
Implementation Method 1
passive UE which are configured to transmit in UL only in response to DL reception
Data Source
AI summary
A method carried out in a User Equipment (10), UE, for transmission of data to a wireless network (100), the method comprising: receiving (412) a poll message (41) from a relay device (20), which poll message identifies a request for data transmission to the wireless network: transmitting (414) a Non-Access Stratum, NAS, message (42) in response to the poll message, said NAS message comprising a protocol data unit, PDU, including the data, and a temporary ID for the UE to address a core network node in the wireless network, wherein the relay device is instructed to forward the NAS message to the wireless network.