SDMA Data Frame Transmission with Segmented Acknowledgment Slots
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Solution Overview
Problem
Current SDMA systems face challenges in efficiently transmitting data frames to multiple wireless apparatuses and receiving acknowledgments, particularly in ensuring reliable communication and high throughput in wireless communication systems with increasing bandwidth demands.
Innovation Solution
The method involves transmitting data frames during a first transmit opportunity and receiving acknowledgments during subsequent opportunities, utilizing multiple antennas for spatial division multiple access (SDMA) in MIMO systems, with techniques like beamforming and precoding to ensure orthogonality between spatial streams, allowing for simultaneous communication with multiple user terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data frames are transmitted to multiple wireless apparatuses simultaneously during a first transmit opportunity, then throughput is improved, but reliability of receiving acknowledgments deteriorates due to potential collisions and interference
Solution Approach 1:
The transmit opportunities are segmented into distinct time slots: a first transmit opportunity for downlink data frame transmission, and separate second transmit opportunities for uplink acknowledgment transmission. This temporal segmentation allows simultaneous service to multiple wireless apparatuses while preventing acknowledgment collisions, as each apparatus has a dedicated acknowledgment transmission slot.
2Productivity
If multiple antennas are used for SDMA to serve multiple user terminals simultaneously, then data transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the multiple-antenna system into distinct functional groups: transmit antennas for downlink data transmission and receive antennas for uplink acknowledgment reception. The transmit and receive operations are further segmented into separate time slots (first and second transmit opportunities), which simplifies the coordination of multiple antennas by preventing simultaneous conflicting operations while maintaining spatial multiplexing benefits.
Solution Approach 2:
The patent implements a nested structure where the SDMA capability (multiple antennas serving multiple terminals) is nested within a time-division framework. The spatial multiplexing of SDMA is contained within the broader temporal structure of alternating downlink and uplink opportunities, allowing the complex multi-antenna system to operate in a simplified, organized manner that maintains high efficiency while managing complexity.
Data Source
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AI summary
Certain aspects of the present disclosure generally relate to communication, and more specifically, to techniques for transmitting data in parallel, such as spatial division multiple access (SDMA) techniques.