Partial Full-Duplex Wireless Transmission via Non-Overlapping Resource Units
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Solution Overview
Problem
Current wireless communication technologies, such as IEEE 802.11, struggle to support low-latency and high-reliability data traffic in unlicensed bands, leading to inefficiencies in channel usage and increased latency due to high collision probabilities and lack of deterministic channel access.
Innovation Solution
The method involves configuring a wireless channel with multiple resource units (RUs) using orthogonal frequency division multiplexing (OFDM) on subcarriers, allowing for simultaneous transmission and reception of wireless transmissions on non-overlapping subsets of RUs, thereby enabling partial full-duplex communication mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If distributed coordination function (DCF) is used for channel access, then channel access is simple and decentralized, but collision probability increases and channel usage efficiency deteriorates under high load
Solution Approach 1:
The patent segments the channel access mechanism into two distinct modes: DCF mode for simple decentralized access and EDCA mode for controlled access with priority queues. This allows the system to choose the appropriate mode based on load conditions, resolving the contradiction between simplicity and efficiency.
Solution Approach 2:
The patent implements dynamic switching between DCF and EDCA modes based on network load conditions. The station can transition from DCF to EDCA when high load is detected, and vice versa when load is low, optimizing both simplicity and efficiency across different operating conditions.
2Productivity
If enhanced distributed channel access (EDCA) is used, then channel usage is improved with priority queues, but channel access becomes more complex and latency increases
Solution Approach 1:
The patent implements partial EDCA functionality by providing priority queues only for specific traffic classes rather than all traffic. This partial implementation achieves improved channel usage for critical traffic while avoiding the full complexity of implementing priority queues for all data types.
3Productivity
If centralized channel access controlled by AP is used, then channel usage efficiency is improved and collisions are reduced, but access control complexity increases
Solution Approach 1:
The patent implements self-service channel access where the station autonomously determines when to switch between DCF and EDCA modes based on local load conditions. The AP provides guidance but the station makes independent decisions, reducing the complexity of centralized control while maintaining high channel usage efficiency.
4Productivity
If full-duplex transmission is implemented, then channel usage efficiency and productivity are maximized, but interference management complexity increases
Solution Approach 1:
The patent applies local quality by using different transmission modes (DCF or EDCA) for different traffic classes and directions. Critical traffic can use full-duplex EDCA mode with priority queues, while non-critical traffic uses simpler half-duplex DCF mode, managing interference locally rather than globally.
Data Source
AI summary
A wireless communication device (10, 11) configures a wireless channel defining multiple resource units, RUs, by orthogonal frequency division multiplexing, OFDM, on a plurality of subcarriers. The wireless communication device (10, 11) sends a first wireless transmission on a first subset of the multiple RUs. While sending the first wireless transmission, the wireless communication device (10, 11) receives a second wireless transmission on a second subset of the multiple RUs. The first subset of the multiple RU's and the second subset of the multiple RUs are at least in part non-overlapping.