Remote Terminal Feedback Transmission via Relay Sidelink
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting feedback information, particularly in asymmetric link configurations, which can lead to delays and increased battery consumption in devices like remote UEs that need to relay data to base stations.
Innovation Solution
A method where a remote terminal receives downlink data and generates feedback information related to the data, transmitting it to a relay terminal through the sidelink, which then transfers this information to the base station, optimizing the timing and path for efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If remote UE transmits feedback information directly to base station through uplink, then feedback reliability is improved, but battery consumption increases and transmission delay increases in asymmetric link configurations
Solution Approach 1:
The patent introduces a relay UE as an intermediary node between the remote UE and the base station. The remote UE transmits feedback information to the relay UE via sidelink, and the relay UE forwards it to the base station via uplink. This mediator approach allows the remote UE to use lower power sidelink transmission instead of high-power direct uplink transmission to the base station.
Solution Approach 2:
The feedback transmission path is segmented into two separate links: a sidelink from remote UE to relay UE, and an uplink from relay UE to base station. This segmentation allows each link to be optimized independently - the sidelink uses lower power suitable for device-to-device communication, while the uplink handles the longer distance to the base station.
2Speed
If remote UE transmits feedback information directly to base station, then transmission speed is improved, but battery consumption and delay increase in relay scenarios
Solution Approach 1:
The relay UE serves as a mediator that receives feedback from the remote UE and forwards it to the base station. This intermediary approach optimizes the transmission path by using the relay UE's closer proximity to the base station, reducing overall transmission delay compared to the remote UE transmitting directly over a longer distance.
Solution Approach 2:
The patent applies different transmission qualities to different segments of the path. The remote UE uses sidelink transmission optimized for short-range device-to-device communication with the relay UE, while the relay UE uses uplink transmission optimized for communication with the base station. This local optimization of transmission quality at each segment improves overall speed.
3Device complexity
If asymmetric link configuration is used for feedback transmission, then device complexity is reduced, but feedback reliability deteriorates
Solution Approach 1:
The relay UE performs multiple functions: it acts as a sidelink receiver from the remote UE and simultaneously as an uplink transmitter to the base station. This multi-functionality allows the system to use asymmetric link configurations (sidelink for remote-relay, uplink for relay-base station) without requiring complex dedicated configurations for each link type, as the relay UE is already designed to handle both modes.
Data Source
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AI summary
Provided according to an embodiment is a method for transmitting feedback information in a wireless network supporting a downlink and a sidelink. Specifically, the method comprises the steps of: receiving, by a remote terminal, downlink data from a base station through the downlink; and transmitting, by the remote terminal, feedback information associated with the downlink data to a relay terminal through the sidelink. The downlink data may be received by the remote terminal through at least one of downlink subframes preceding an (n-k)th subframe, where n and k each denote an arbitrary positive integer. The feedback information associated with the downlink data may be generated by the remote terminal in the (n-k)th subframe. The feedback information associated with the downlink data may be transmitted to the relay terminal by the remote terminal in an nth subframe.