Relay UE Disaster Message Forwarding in D2D Systems
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in efficiently transmitting and receiving disaster information messages between relay and remote User Equipments (UEs) in a D2D communication system.
Innovation Solution
A method and apparatus for signal reception in a D2D wireless communication system, where a relay UE receives a disaster information message from a base station and determines whether to forward it to remote UEs based on message equality and acknowledgement, optimizing transmission by avoiding redundant messages and conserving system resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay UE forwards all received disaster information messages to remote UEs, then the reliability of information delivery is improved, but the system resource consumption increases due to redundant transmissions
Solution Approach 1:
The relay UE monitors acknowledgements from remote UEs to determine whether disaster information messages have been successfully received. Based on this feedback, the relay UE selectively retransmits only those messages that were not acknowledged, avoiding redundant transmissions while ensuring reliable delivery.
Solution Approach 2:
The transmission behavior of the relay UE is dynamically adjusted based on the receipt of acknowledgements. When acknowledgements are received indicating successful delivery, the relay UE changes its parameter from retransmitting to not retransmitting, thereby optimizing resource usage while maintaining reliability.
2Adaptability or versatility
If the relay UE transmits disaster information messages to all remote UEs, then the coverage and accessibility of information is improved, but the message transmission efficiency deteriorates due to redundant messages
Solution Approach 1:
The system uses acknowledgement feedback from remote UEs to the relay UE to determine which messages need retransmission. This feedback mechanism enables the relay UE to transmit messages only when necessary, improving transmission efficiency while maintaining comprehensive coverage and accessibility.
Solution Approach 2:
Instead of transmitting disaster information messages to all remote UEs unconditionally, the relay UE performs partial action by transmitting only to those UEs that have not yet acknowledged receipt. This selective transmission maintains information accessibility while significantly improving transmission efficiency.
3Loss of information
If the relay UE continuously monitors and forwards messages, then the information delivery completeness is improved, but the power consumption of IoT UEs with limited power increases
Solution Approach 1:
Remote UEs send acknowledgements to the relay UE when they successfully receive disaster information messages. This feedback allows the relay UE to stop retransmitting to UEs that have already received the information, reducing unnecessary power consumption while ensuring complete information delivery.
Solution Approach 2:
The system establishes an acknowledgement mechanism in advance that allows remote UEs to notify the relay UE of successful reception. This preliminary action prevents future redundant transmissions and reduces power consumption while maintaining information completeness.
Data Source
AI summary
The present invention pertains to a wireless communication system. More specifically, a signal transmission and reception method is proposed, wherein the method for a relay terminal transmitting and receiving a signal in a device to device (D2D) wireless communication system comprises receiving a disaster information message from a base station, and transmitting the disaster information message to one or more remote terminals if a message including the same disaster information as the disaster information message has not been received already.