Wireless Terminal Acknowledgement State Management
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Solution Overview
Problem
Existing wireless communication systems for remote field sensors and industrial automation face inefficiencies due to the lack of feedback in open-loop systems, leading to unnecessary retransmissions and energy wastage, as terminals do not know if their transmissions are successful, and may not even know when they are in the receiver's field of view.
Innovation Solution
Implementing a method where terminals in a multiple access slotted wireless communication system transmit messages, receive acknowledgement messages, and enter an inactive state if the transmission is successful, using positive or negative acknowledgements to determine successful reception and optimize transmission probability based on previous attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals continuously retransmit messages without feedback in open-loop systems, then terminals ensure their messages are sent, but energy consumption increases and packet loss increases due to unnecessary retransmissions
Solution Approach 1:
The patent implements an acknowledgement (ACK) mechanism where the receiver sends feedback to terminals indicating whether their transmissions were successful. Terminals monitor for ACK messages and only retransmit if they receive a negative acknowledgement or no acknowledgement, thereby eliminating unnecessary retransmissions and reducing energy consumption while maintaining reliable message delivery
Solution Approach 2:
Terminals autonomously manage their transmission state by monitoring ACK messages and automatically transitioning between active and inactive states based on reception success, without requiring continuous external control or intervention
2Reliability
If terminals remain in active state to ensure message delivery, then message transmission reliability improves, but system efficiency deteriorates due to continuous monitoring and potential unnecessary transmissions
Solution Approach 1:
The ACK mechanism provides explicit feedback to terminals about transmission success, allowing the system to efficiently manage terminal states. Successful transmissions trigger inactive states, while failed transmissions trigger controlled retransmissions, optimizing overall system efficiency while maintaining reliability
Solution Approach 2:
Terminals dynamically transition between active and inactive states based on ACK reception. This dynamic state management allows the system to adapt to actual transmission outcomes, keeping terminals active only when necessary and inactive when messages are successfully delivered, thereby improving overall system efficiency
3Adaptability or versatility
If terminals transmit without knowing receiver field of view, then communication coverage is maximized, but energy is wasted on transmissions that cannot be received
Solution Approach 1:
The ACK mechanism provides feedback that indirectly informs terminals about reception success. While terminals don't directly detect field of view, the presence or absence of ACK messages provides information about whether transmissions were successfully received, allowing terminals to adjust their behavior and avoid wasteful retransmissions of messages that are already successfully delivered
Data Source
AI summary
A multiple access slotted wireless communication system comprising a plurality of terminals and a multi-access receiver is described. The multi-access receiver can decode multiple transmissions in each slot of a frame from terminals in its field of view. Each terminal has an active state for transmitting and an inactive state. After receiving acknowledgement of a successful transmission by the terminal, the terminal enters the inactive state for at least a transmission delay time. This may be the remaining time that the terminal is in the field of view of the multi-access receiver. This may be achieved by the terminal using a probability of transmission to determine whether or not to transmit in the next frame. The terminal may also be configured to select the slot in a frame, and this may be based upon information such as which slots were acknowledged. The receiver may use compression to transmit acknowledgement messages.