Full-Duplex Access Point Joint Downlink Uplink Timing Advance
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Solution Overview
Problem
Current wireless communication technologies face challenges in maximizing data throughput due to strong transmission echoes in full-duplex environments, requiring extensive media access control protocol designs to suppress echoes and enable simultaneous transmission and reception at the same frequency band, especially when full-duplex capable access points communicate with legacy half-duplex stations.
Innovation Solution
The implementation of joint downlink and uplink transmission procedures in WiFi MAC protocols, allowing full-duplex access points to schedule simultaneous transmissions with half-duplex stations without requiring standard changes, using techniques like block acknowledgement, timing advance, and hybrid coordination function controlled channel access to optimize transmission efficiency and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is implemented to double data throughput, then productivity is improved, but device complexity increases due to extensive MAC protocol designs required to suppress transmission echoes
Solution Approach 1:
The patent introduces a timing advance mechanism as an intermediary parameter that coordinates the transmission timing between full-duplex access points and half-duplex stations. By adjusting the timing advance value, the system enables simultaneous DL and UL transmissions without requiring complex echo suppression protocols, thus achieving throughput improvement while limiting protocol complexity growth
Solution Approach 2:
The patent changes the transmission timing parameter (timing advance) to resolve the contradiction. By dynamically adjusting this parameter, the system allows full-duplex operation to coexist with half-duplex stations, enabling throughput doubling without implementing extensive MAC protocol modifications for echo suppression
2Productivity
If simultaneous downlink and uplink transmissions are scheduled, then productivity is improved, but object-affected harmful factors increase due to transmission echoes and interference
Solution Approach 1:
The patent applies preliminary anti-action by calculating and applying timing advance values before simultaneous DL-UL transmissions begin. This pre-adjustment of transmission timing prevents echo and interference issues from occurring in the first place, allowing high-efficiency joint transmissions without suffering from the harmful effects of simultaneous full-duplex operation
3Productivity
If joint DL-UL transmissions are enabled to enhance throughput, then productivity is improved, but reliability decreases due to reduced signal strength requirements and potential preamble detection failures
Solution Approach 1:
The patent performs preliminary action by calculating timing advance values and adjusting transmission timing before joint DL-UL transmissions commence. This pre-synchronization ensures that preambles are detected reliably even in the presence of simultaneous transmissions, maintaining high reliability while achieving throughput enhancement through joint transmissions
Data Source
AI summary
In a communication method to communicate between an access point (AP) and first and second communication stations (STAs) can include calculating joint transmission information based on the first and the second STAs, establishing an uplink communication between the AP and the first STA; and establishing a downlink communication between the AP and the second STA jointly with the uplink communication between the AP and the first STA based on the joint transmission information.