Uplink MU-MIMO Access Point Synchronization Window
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Solution Overview
Problem
In wireless local area networks, achieving accurate time synchronization for uplink communication among multiple terminals is challenging due to independent channel access, which limits throughput in random access communication environments.
Innovation Solution
An access point receives request frames from terminals, waits for additional requests during a predetermined window, and transmits response frames to synchronize and assign resources for simultaneous uplink communication, adjusting the waiting window based on the number of users and available resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple terminals independently transmit frames during uplink communication, then each terminal can access the channel autonomously, but accurate time synchronization cannot be achieved
Solution Approach 1:
The access point transmits a preliminary synchronization frame before the uplink communication period. This frame contains timing information that terminals use to synchronize their transmissions in advance, ensuring that despite independent channel access, all terminals transmit at precisely synchronized times during the uplink slot.
2Productivity
If the access point waits for additional request frames during a predetermined window, then resource allocation can be optimized, but communication delay increases
Solution Approach 1:
The access point dynamically adjusts the length of the predetermined window based on network conditions, terminal activity, and resource availability. When traffic is light, the window is shortened to minimize delay. When multiple terminals are active, the window is extended to capture more request frames, optimizing the balance between resource allocation efficiency and communication delay.
Data Source
Figure 1A~1H
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AI summary
Provided is a communication method of an access point and a plurality of terminals that are capable of enhancing a throughput of an overall network in a random access environment by enabling the access point to wait for additional terminals to transmit data through uplink communication during a predetermined waiting window.