Transmit Diversity Antenna Switching for Frame Retransmission
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Solution Overview
Problem
Wireless transmission systems face challenges in ensuring successful data frame delivery due to frame loss or corruption, even with multiple antennas, as conditions for successful transmission can change rapidly, leading to inefficient retransmissions and potential discarding of frames, especially for critical data like program instructions or voice transmissions.
Innovation Solution
A method for a transmitter to select a first antenna for data frame transmission, determine successful receipt, and switch to a different antenna for retransmissions if the frame is not received, with the option to discard the frame after a predetermined number of attempts based on the type of data, ensuring each retransmission attempt uses a different antenna than the previous one.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmitter uses multiple antennas to increase transmission reliability, then the likelihood of successful frame delivery is improved, but the complexity of determining which antenna to use and managing retransmissions increases
Solution Approach 1:
The system dynamically switches between different transmitting antennas based on transmission success or failure. When a frame is successfully received, the current antenna remains selected; when failure occurs, the system transitions to a different antenna for retransmission. This dynamic adaptation resolves the contradiction by automatically managing antenna selection complexity through success/failure-based state changes.
Solution Approach 2:
The transmitter uses feedback from reception status (acknowledgement signals) to determine whether to reuse the same antenna or switch to a different one for retransmission. This feedback mechanism simplifies the management complexity by providing clear decision criteria: successful reception maintains current antenna selection, while failure triggers antenna switching.
2Productivity
If the transmitter repeatedly retransmits frames over the same antenna, then more transmission attempts are made, but the frame may be discarded after exceeding the maximum attempt count
Solution Approach 1:
The system dynamically changes the transmitting antenna for each retransmission attempt. Instead of repeatedly using the same antenna, the system transitions to a different antenna for each retry, thereby increasing the number of meaningful transmission attempts without wasting resources on futile repetitions over a failing antenna.
Solution Approach 2:
The system changes the antenna parameter for each retransmission attempt. By varying the antenna selection parameter across multiple attempts, the system maximizes the probability of successful delivery while managing the maximum attempt count effectively.
3Loss of energy
If the transmitter discards frames after a certain number of transmission attempts, then resources are conserved, but the perceived quality of transmission deteriorates for sensitive data like voice
Solution Approach 1:
The system dynamically adjusts the number of transmission attempts based on data type characteristics. For sensitive data like voice, the system allows more retransmission attempts before discarding, thereby maintaining perceived quality. For less sensitive data, the discard threshold is lower, conserving resources. This dynamic adjustment resolves the contradiction between resource conservation and quality maintenance.
Data Source
AI summary
A transmitter including a plurality of transmitting antennas and a processor operably coupled to the plurality of transmitting antennas. The processor is configured to select a first antenna from the plurality of transmitting antennas for transmission of a frame of data, determine if the frame is successfully received by a receiver, and select a second antenna different than the first antenna from the plurality of transmitting antennas for retransmission of the frame if it is determined that the frame was not successfully received by the receiver. The processor is configured to select a different antenna than a previous antenna for retransmission of the frame each time it is determined that the frame was not successfully received by the receiver. The processor is configured to discard the frame from further transmission if it is determined that the frame was not successfully received by the receiver after a number of transmission attempts.