FDD Wireless Device Concurrent Uplink Downlink Transmission
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Solution Overview
Problem
Current Wi-Fi protocols face inefficiencies due to increased preamble transmission time and overhead, especially with the use of aggregated MAC layer data units, which are not tolerated by delay-sensitive applications, and the IEEE 802.11ax HE protocol's OFDMA method splits channel bandwidth, increasing per-user transmission time.
Innovation Solution
The solution involves using frequency division duplexing (FDD) to transmit downlink and uplink payloads on separate subcarriers, with a trigger configuring devices to transmit uplink payloads during downlink payload transmission, allowing concurrent transmission and reception to maximize time overlap and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aggregated MAC layer data units are used to improve throughput, then network utilization improves, but transmission delay increases making it intolerable for delay-sensitive applications
Solution Approach 1:
The patent segments the aggregated MAC data units into smaller units that can be transmitted in parallel using OFDMA. Instead of transmitting one large aggregated frame that causes delay, multiple smaller frames are transmitted simultaneously across different frequency resources, maintaining high network utilization while reducing individual transmission delay for delay-sensitive traffic.
Solution Approach 2:
The patent introduces frequency domain parallelism as an additional dimension for data transmission. By utilizing multiple frequency subcarriers simultaneously for different data units, the system achieves both high throughput (original goal) and low delay (new requirement) by transmitting data across the frequency dimension rather than sequentially in time.
2Productivity
If OFDMA splits channel bandwidth to improve network utilization, then aggregate throughput improves, but per-user transmission time increases
Solution Approach 1:
The patent implements dynamic resource allocation where frequency resources are dynamically assigned based on user requirements. Users with delay-sensitive traffic are allocated wider frequency bands or prioritized resources, while users tolerant of higher delay can use narrower bands. This dynamic adjustment allows the system to optimize both aggregate throughput and individual user transmission time based on real-time traffic conditions.
3Adaptability or versatility
If legacy preamble is transmitted for back-compatibility, then interoperability is maintained, but overhead time increases reducing efficient communication
Solution Approach 1:
The patent applies partial legacy preamble transmission by sending only the essential portions of the legacy preamble that provide back-compatibility, while omitting or compressing redundant elements. This allows maintaining interoperability with legacy devices while significantly reducing the time overhead consumed by preamble transmission, thereby improving efficient communication for modern devices.
Data Source
AI summary
A device on a wireless network generates duration data for determining a duration of a time interval. A transmission is then instructed, by the device, to transmit the duration data and a downlink payload including an aggregated Media Access Control (MAC) layer data unit, the downlink payload being transmitted on first subcarriers. The transmission also includes a trigger that configures the at least one other device on the network to transmit an uplink payload within the time interval, and during at least part of the transmission of the downlink payload, on second subcarriers that are at different frequencies to the first subcarriers.