Relay Header Control Information for MTC Uplink Feedback
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Solution Overview
Problem
In wireless communication systems, especially in Machine Type Communication (MTC) networks, uplink-only relaying faces challenges in feeding back control information from relay devices to terminal devices, which hampers efficient data transmission due to the lack of direct feedback mechanisms.
Innovation Solution
The implementation of a relay header with control information is added to messages transmitted from terminal devices to base stations via relay devices, allowing the base station to transmit this control information back to the terminal devices, enabling them to adjust their transmission power and timing for subsequent communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If uplink-only relaying is used to extend coverage and support low-power MTC devices, then the uplink transmission capability is improved, but the ability to provide feedback control information to terminal devices deteriorates
Solution Approach 1:
The base station acts as an intermediary to deliver control information to the terminal device. The relay device sends control information to the base station, which then transmits it to the terminal device, enabling indirect feedback delivery in an uplink-only relay configuration
Solution Approach 2:
The control information is nested within existing uplink message structures. The relay device encapsulates control information in messages that are already being transmitted to the base station, efficiently utilizing existing communication channels without requiring separate feedback channels
2Area of stationary object
If relay devices are deployed to support cell-edge MTC devices, then coverage is improved, but system complexity increases due to additional relay management
Solution Approach 1:
The relay device performs multiple functions using the same communication infrastructure: it relays user data, transmits control information, and enables power control, all through the existing uplink-only relay mechanism, reducing the need for separate management systems
Solution Approach 2:
The terminal device autonomously uses the control information received from the base station to adjust its own transmission parameters (power and timing), eliminating the need for complex centralized relay management and enabling self-optimization
Data Source
AI summary
A wireless communications system is described which comprises a base station, a relay device, and a terminal device. The terminal device is operable to transmit a message to the base station via the relay device. The relay device is operable to add a relay header to the message received from the terminal device, the relay header comprising control information for controlling the transmission of subsequent messages from the terminal device to the relay device. The relay device is also operable to relay the message having the relay header added to the base station. By adding such control information to messages being relayed from the terminal device to the base station on the uplink, subsequent downlink communications from the base station to the terminal device can include the control information generated at the relay device (or transmission parameters derived from the control information).