Multi-User MIMO Power Saving via Data Buffering
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Solution Overview
Problem
Current communication systems, particularly WLAN systems using the MIMO scheme, lack effective methods for maximizing power saving efficiency while maintaining high throughput for stable transmission and reception of large-capacity data, especially when serving multiple users.
Innovation Solution
The implementation of various power saving schemes such as legacy power saving, automatic power save delivery (APSD), and power save multi poll (PSMP) schemes, including unscheduled automatic power save delivery (u-APSD), to manage state shifting between sleep and wake modes, optimizing data transmission and reception through multi-user MIMO configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power saving schemes are implemented to reduce power consumption, then power saving efficiency is improved, but data transmission stability and throughput may deteriorate
Solution Approach 1:
The access point buffers data in advance during wake periods so that when terminals wake up, data is ready for immediate transmission. This preliminary data preparation reduces the need for frequent wake-ups and maintains transmission stability while saving power.
Solution Approach 2:
The system uses feedback mechanisms where terminals send wake requests and the access point responds with data availability information. This feedback loop optimizes the balance between power saving and data transmission reliability by adjusting wake schedules based on actual data needs.
2Loss of energy
If power saving schemes are implemented to maximize power saving efficiency, then power consumption is reduced, but throughput and data transmission rate may worsen
Solution Approach 1:
Data is buffered at the access point in advance during terminal sleep periods, so when terminals wake up, data is ready for immediate transmission. This eliminates transmission delays and maintains high throughput while the terminal remains in power-saving mode for longer periods.
Solution Approach 2:
The system maintains continuous data availability through buffering and quick wake-up mechanisms, ensuring that data transmission can resume immediately without interruption. This continuity preserves throughput while maximizing power saving opportunities.
3Productivity
If multi-user MIMO scheme is used to improve data transmission rate, then throughput is improved, but system complexity increases
Solution Approach 1:
The system segments data transmission into separate uplink and downlink phases, with the access point handling buffer management and scheduling independently from the actual data transmission. This segmentation simplifies the control logic while maintaining high throughput through multi-user MIMO.
Solution Approach 2:
The access point performs multiple functions including data buffering, wake-up coordination, power saving management, and multi-user scheduling within a single integrated system. This multi-functionality reduces overall system complexity by consolidating control functions.
Data Source
AI summary
Disclosed are an apparatus and a method for transmitting/receiving data while providing power saving efficiency of a terminal, for example, a station (hereinafter, referred to as ‘STAS) in a communication system providing services to multi users in a multi-input multi-output (hereinafter, referred to as ‘MIMO’) scheme. The apparatus for transmitting data includes: a receiving unit configured to receive an uplink frame from a plurality of terminals by a multi user-multiple-input multiple-output (MIMO) scheme; a generating unit configured to generate a packet including support information on a multi user-power saving scheme with the terminals; a buffering unit configured to buffer data corresponding to the terminals; and a transmitting unit configured to transmit a downlink frame including the generated packet and the buffered data to the terminals by the multi user-MIMO scheme.