Wireless Communication Device ACK Frame Timing Synchronization
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Solution Overview
Problem
In full duplex wireless communication systems, the difference in time lengths between uplink and downlink traffic can lead to synchronization issues with ACK frame reception, potentially causing hidden or exposed terminal problems, which degrade system throughput.
Innovation Solution
A wireless communication device that synchronizes the transmission timing of ACK frames by controlling the maximum transmission time length and ACK frame length, ensuring that both the start and completion times of ACK frames coincide across terminals, using control information transmitted within trigger frames or other control frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented to improve system throughput, then time resource utilization is improved, but synchronization of ACK frame reception timing deteriorates due to differences in uplink and downlink traffic time lengths
Solution Approach 1:
The access point performs preliminary actions by determining the fourth time length (ACK transmission time) in advance and notifying terminals of this value before ACK transmission occurs. This allows terminals to prepare for synchronized ACK transmission, ensuring that both uplink and downlink ACK frames are received at the same time without requiring complex real-time adjustments during communication.
2Reliability
If ACK transmission timing is adjusted to synchronize reception timing, then reliability of communication is improved, but transmission time flexibility deteriorates due to constraints on ACK frame length and timing
Solution Approach 1:
The system changes the parameter of ACK frame time length to achieve synchronization. By notifying terminals of the fourth time length (ACK transmission duration) and adjusting ACK frame lengths accordingly, the system maintains reliable synchronized reception while adapting to different traffic conditions. The access point can flexibly set this time length based on actual communication needs.
3Reliability
If uplink and downlink traffic time lengths are made equal to prevent hidden terminal problems, then synchronization is improved, but system throughput deteriorates due to inefficient resource utilization
Solution Approach 1:
The invention resolves the contradiction by introducing a new time dimension (the fourth time length for ACK transmission) separate from the data transmission time lengths. This allows uplink and downlink data transmissions to have different durations for optimal throughput, while ACK transmissions are synchronized in a separate temporal dimension, eliminating the need to equalize data transmission times.
4Reliability
If ACK frame length is extended to match longer traffic frames, then timing synchronization is improved, but transmission efficiency deteriorates due to increased overhead
Solution Approach 1:
The system applies local quality by making ACK frame lengths adaptive rather than uniform. Each ACK frame's length is specifically adjusted to match the corresponding data frame's duration requirements, notified through the fourth time length parameter. This ensures timing synchronization locally for each transmission pair without unnecessarily extending all ACK frames, maintaining transmission efficiency.
Data Source
AI summary
According to one embodiment, a wireless communication device includes a receiver and a transmitter. The receiver receives a first frame in a predetermined frequency band. The transmitter transmits a second frame in the predetermined frequency band at a same time as receipt of the first frame. The transmitter transmits control information that controls a transmission timing of a third frame that is a response frame to the second frame. The transmitter transmits a fourth frame that is a response frame to the first frame, at a timing according to the control information.