OFDMA Uplink Access Method for High-Density WLAN Throughput
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-density WLAN environments, existing OFDMA-based multiple access protocols face significant challenges with increased competition and backoff times, leading to reduced system throughput due to inefficient resource allocation and lack of adaptability in dynamically changing service needs.
Innovation Solution
An OFDMA-based uplink access method that dynamically adjusts the number of time slot blocks and randomly selects subchannels for access, allowing multiple users to access channels more efficiently by utilizing time and subchannel resources effectively, and includes a resource allocation mechanism to prioritize successful access probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If existing OFDMA-based multiple access protocols are used in high-density WLAN environments, then the network can support multiple users, but the competition and backoff times increase significantly, leading to reduced system throughput
Solution Approach 1:
The patent implements dynamic resource allocation where the AP adjusts time slot block assignments based on real-time channel conditions and user requirements. The system transitions from static resource allocation to dynamic allocation, allowing the network to adapt to changing traffic patterns and user densities, thereby maintaining high throughput even with increased user numbers
Solution Approach 2:
The patent segments the uplink transmission opportunity into multiple time slot blocks, allowing multiple users to access different segments simultaneously. This segmentation of the transmission medium into discrete time slots enables parallel access for multiple users without causing collisions, thus supporting high user density while maintaining system throughput
2Quantity of substance
If existing OFDMA-based multiple access protocols are used in high-density WLAN environments, then the network can support multiple users, but the resource allocation lacks adaptability to dynamically changing service needs
Solution Approach 1:
The patent implements a feedback mechanism where the AP monitors channel conditions, user buffer states, and transmission success rates, then adjusts resource allocation in subsequent transmissions. This closed-loop control enables the system to adapt resource allocation to dynamically changing service needs, ensuring optimal performance in high-density environments with varying traffic patterns
Solution Approach 2:
The system transitions from static resource allocation to dynamic allocation based on real-time network conditions. The AP can adjust the number of time slot blocks assigned to each user, modify subchannel assignments, and adapt to changing service requirements, thereby achieving high adaptability to dynamically changing service needs
3Quantity of substance
If existing OFDMA-based multiple access protocols are used in high-density WLAN environments, then the network can support multiple users, but the average time for users to access channels increases, increasing transmission delay
Solution Approach 1:
The patent implements a mechanism where the AP pre-allocates time slot blocks to users based on their buffer status and service requirements before actual data transmission. This preliminary allocation reduces the need for contention and backoff procedures, allowing users to access channels more quickly and reducing average channel access time even in high-density environments
Solution Approach 2:
By segmenting the uplink opportunity into multiple time slot blocks and assigning them to different users, the system enables parallel access for multiple users. This eliminates the sequential access pattern that causes increased delay, allowing simultaneous transmissions and reducing average channel access time
Data Source
AI summary
An embodiment of the present invention provides an uplink access method based on an orthogonal frequency-division multiple access mechanism, comprising: determining the number of subchannels available for a current transmission and the number of time slot blocks required for the current access; transmitting uplink access trigger frames on the available subchannels; randomly selecting among the available subchannels and the time slot blocks; and transmitting an uplink access response frame to an access point by the randomly selected available subchannel and time slot block, to perform random access. The embodiment of the present invention can reduce an average time taken by users to access channels, thereby reducing transmission delay of data packet, reducing waste of time and subchannel resources, and improving the throughput of the entire network.