LTE Feedback Mechanism for Connectionless Data Reliability
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Solution Overview
Problem
In LTE communications systems, especially in Machine to Machine (M2M) networks with connectionless data transmission, there is no method for the base station (eNB) to provide feedback to user equipment (UE) when uplink data is not successfully received, leading to low reliability due to the lack of acknowledgment, causing UEs to not resend data.
Innovation Solution
The UE adds identity information to uplink data and the eNB returns downlink feedback information based on this identity, allowing the UE to determine if the data was successfully received, enabling retransmission when necessary, thus improving system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If connectionless data transmission is used to simplify the transmission process, then the ease of operation is improved, but the reliability deteriorates due to lack of feedback mechanism
Solution Approach 1:
The patent introduces an acknowledgment feedback mechanism where the eNB sends ACK/NACK signals to the UE based on successful uplink data reception. This feedback allows the UE to determine whether to resend data, thereby improving reliability while maintaining the simplicity of connectionless transmission for small data packets.
2Productivity
If multiple UEs transmit uplink data in the same time-frequency resource to improve productivity, then the data transmission efficiency is improved, but the reliability deteriorates because the eNB cannot successfully receive all UEs' data
Solution Approach 1:
The patent implements individual acknowledgment feedback for each UE even when multiple UEs share the same time-frequency resource. The eNB sends separate ACK/NACK signals to each UE based on whether it successfully decoded that UE's data, enabling each UE to independently determine if retransmission is needed.
Solution Approach 2:
The patent segments the feedback mechanism by assigning unique identifiers to each UE and providing individual acknowledgment signals for each UE's data transmission. This segmentation allows the system to handle multiple UEs simultaneously while maintaining individual reliability tracking for each UE.
3Device complexity
If no feedback information transmission method is implemented to maintain system simplicity, then the device complexity is reduced, but the reliability deteriorates as UEs cannot learn when data transmission fails
Solution Approach 1:
The patent introduces a lightweight feedback mechanism using simple ACK/NACK signals sent from eNB to UE. This minimal feedback approach provides just enough information for the UE to determine transmission success or failure without adding significant system complexity, thereby improving reliability with minimal overhead.
Data Source
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AI summary
The present invention provides a feedback information transmission method, user equipment, and a base station. The method includes: sending, by user equipment UE, uplink data and identity information that is corresponding to the UE to a base station eNB; and receiving, by the UE, downlink feedback information of the UE that is sent by the eNB according to the identity information. By using a feedback information transmission method, user equipment, and a base station that are provided by the present invention, reliability of a communications system that uses a connectionless data transmission manner is improved.