Aggregated Uplink Control via Scheduling Frames
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmissions from multiple stations to an access point, particularly in minimizing traffic and optimizing bandwidth usage.
Innovation Solution
The method involves generating and transmitting an aggregated message from the access point that includes a single-user broadcast message and multiple user messages, using physical layer data units with control and scheduling information, to coordinate uplink data transmissions from multiple stations, including scheduling messages that specify transmission times, frequencies, and allowed transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple stations transmit uplink data independently without coordination, then each station can transmit whenever it has data, but this increases traffic overhead and causes interference on the wireless channel
Solution Approach 1:
The access point performs preliminary scheduling of uplink transmissions by sending downlink frames that contain resource allocation information to multiple stations before they transmit. This preliminary action coordinates the uplink transmissions, ensuring stations transmit only at scheduled times and frequencies, thereby reducing interference and optimizing channel utilization.
Solution Approach 2:
The system dynamically allocates uplink resources to different stations based on current network conditions, data buffer states, and quality of service requirements. The access point can adjust transmission parameters such as modulation schemes, coding rates, and resource block assignments in real-time, allowing the system to adapt to changing conditions and maximize throughput while minimizing interference.
2Loss of information
If the access point sends separate downlink frames to each station, then each station receives its specific control information, but this increases the total traffic volume between the access point and multiple stations
Solution Approach 1:
The access point merges control information for multiple stations into a single downlink frame. This aggregated frame contains scheduling information, resource allocations, and control data for multiple stations simultaneously, reducing the total number of transmissions required and minimizing traffic overhead while ensuring all stations receive their necessary control information.
3Productivity
If multiple stations transmit uplink data simultaneously without scheduling, then channel utilization increases, but this causes severe interference and collision between transmissions
Solution Approach 1:
The system segments the uplink transmission resources into distinct time slots, frequency bands, and spatial streams that are allocated to different stations. This segmentation prevents simultaneous transmissions from colliding, as each station is assigned specific resources where it is the only active transmitter, thereby eliminating interference while maintaining high overall channel utilization.
Solution Approach 2:
The resource allocation is dynamically adjusted based on real-time network conditions, allowing the system to optimize the balance between simultaneous transmissions and interference avoidance. The access point can change modulation schemes, coding rates, and resource assignments adaptively, ensuring reliable transmission while maximizing bandwidth utilization.
Data Source
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AI summary
Methods and apparatus for multiple user uplink are provided. In one aspect, a method includes generating, at an access point, an aggregated message. The aggregated message includes a single-user broadcast message and at least one other message. The method further includes transmitting the aggregated message to one or more stations.