Uplink Multiuser MIMO Retransmission Coordination
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Solution Overview
Problem
In uplink multiuser MIMO wireless communication systems, existing technologies lack a method to effectively multiplex and transmit retransmission data and new data simultaneously, leading to a decrease in system throughput due to a limited user multiplexing number during retransmissions.
Innovation Solution
A wireless communication system that includes a receiver for receiving spatially multiplexed frames and a transmitter for sending acknowledgement response frames containing check results and authorization information, allowing selected wireless terminals to transmit new data simultaneously with retransmission data, thereby maintaining a high user multiplexing number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission data is transmitted alone without multiplexing new data, then transmission reliability is improved, but user multiplexing number decreases and system throughput deteriorates
Solution Approach 1:
The patent combines retransmission data and new data into a single uplink multiuser MIMO transmission. The access point assigns both retransmission frames from terminals requiring retransmission and new frames from other terminals to the same transmission opportunity, maintaining spatial multiplexing and improving system throughput while ensuring reliable retransmission delivery
2Productivity
If new data is multiplexed with retransmission data in uplink multiuser MIMO, then system throughput is improved, but transmission complexity increases due to coordination requirements
Solution Approach 1:
The access point uses feedback from downlink multiuser MIMO transmission (acknowledgement responses from terminals) to determine which terminals require retransmission. Based on this feedback, the access point coordinates uplink resources to assign retransmission and new data transmissions, managing the complexity through informed resource allocation
3Reliability
If user multiplexing number is reduced during retransmission, then individual terminal transmission reliability is improved, but overall system efficiency deteriorates
Solution Approach 1:
The uplink multiuser MIMO transmission serves multiple functions simultaneously: it delivers retransmission data to terminals that failed previous transmissions and delivers new data from other terminals. This multi-functional approach maintains high user multiplexing numbers while ensuring reliable retransmission delivery
Data Source
AI summary
According to one embodiment, a wireless communication device includes: a receiver configured to receive a plurality of first frames transmitted by spatial multiplexing; and a transmitter configured to transmit a second frame containing check results indicating whether the first frames are successfully received and first information specifying at least one communication device. The receiver is configured to receive a plurality of third frames transmitted by spatial multiplexing from a communication device having transmitted the first frame the check result of which represents failure and the communication device specified in the first information.