Uplink Medium Access Control Protocol for Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multiple user uplink transmissions, particularly in minimizing control overhead traffic between access points and user terminals, which affects bandwidth utilization and data throughput.
Innovation Solution
The implementation of a method and apparatus for multiple-user wireless communication, where user terminals store uplink data in a transmit buffer and initiate transmissions based on a timer or threshold, receiving a 'clear to transmit' message from an access point to coordinate concurrent data transmission with other terminals, optimizing the use of channel resources and reducing control overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user terminals transmit uplink data concurrently to an access point, then data throughput and bandwidth utilization are improved, but control overhead traffic and coordination complexity increase
Solution Approach 1:
Multiple user terminals are grouped together to transmit uplink data concurrently in a single coordinated transmission opportunity. The access point sends a group CTX frame that triggers simultaneous transmissions from multiple terminals, merging what would otherwise be separate sequential transmissions into one efficient batch operation, thereby improving throughput while minimizing control overhead per terminal.
Solution Approach 2:
The access point sends a clear-to-transmit (CTX) frame to user terminals in advance, indicating that they are authorized to transmit uplink data. This preliminary authorization allows terminals to prepare and transmit data concurrently at the specified time without requiring individual real-time coordination, reducing control overhead while enabling efficient parallel transmissions.
2Reliability
If user terminals wait for clear to transmit frames before sending data, then collision and interference are reduced, but transmission latency increases
Solution Approach 1:
The access point sends clear-to-transmit frames periodically or at scheduled intervals, creating predictable transmission opportunities for user terminals. This periodic structure allows terminals to plan their transmissions in advance, reducing uncertainty and latency while maintaining reliable collision-free communication through the coordinated timing established by the periodic CTX frames.
Data Source
AI summary
A user terminal for multiple-user wireless communication is provided, comprising a transmit buffer configured to store uplink data for transmission. The user terminal comprises a processor configured to generate a request to transmit frame in response to uplink data being present in the transmit buffer, and initiate a transmit timer for determining when to transmit the request to transmit frame. The user terminal comprises a transmitter configured to transmit the request to transmit frame when the transmit timer expires or when the uplink data present in the transmit buffer exceeds a threshold amount. The user terminal comprises a receiver configured to receive a clear to transmit frame from an access point based on the transmitted request to transmit frame. The transmitter is further configured to transmit the uplink data present in the transmit buffer, concurrently with at least one other user terminal transmitting uplink data, to the access point at a specified time based on receiving the clear to transmit frame addressed to the user terminal.