Wireless Resource Allocation for Interference Avoidance
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Solution Overview
Problem
High-density environments in Wireless Local Area Networks (WLANs) lead to inefficiencies due to increased interference among devices, causing re-transmissions and decreased performance, as existing media access control schemes like EDCA are not optimized for high AP and station densities.
Innovation Solution
A system and method for digital communications that involves stations receiving indicators of network resource utilization to determine permitted transmission times and locations, allowing them to transmit packets without interfering with acknowledgement information, thereby reducing interference and improving system efficiency through scheduling and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of devices in WLAN increases to support more users, then the coverage and user capacity improve, but the interference among devices increases causing re-transmissions and decreased efficiency
Solution Approach 1:
The patent segments the communication resources by dividing the set of resource units into multiple groups, where each group is associated with a specific transmission type (data or acknowledgement). This segmentation allows stations to clearly identify which resource units are allocated for acknowledgements versus data transmissions, reducing interference and confusion in high-density environments.
Solution Approach 2:
The access point performs preliminary action by allocating and indicating resource units for acknowledgements before the actual data transmission occurs. The network resource usage indicator is generated in advance to inform stations about the resource allocation, allowing them to prepare and avoid conflicts before transmissions begin.
2Adaptability or versatility
If traditional EDCA based media access control scheme is used in high density environments, then the system maintains compatibility with existing standards, but the transmission efficiency decreases due to increased interference and re-transmissions
Solution Approach 1:
The patent introduces dynamic resource allocation where the access point adaptively assigns different resource units for data and acknowledgements based on current network conditions and traffic patterns. This dynamic approach allows the system to optimize performance in high-density environments while maintaining the basic EDCA framework for compatibility.
Solution Approach 2:
The system implements feedback mechanisms where the access point monitors transmission success and resource utilization, then adjusts resource allocation accordingly. The network resource usage indicator provides feedback information to stations about which resources are occupied, enabling them to make informed transmission decisions and avoid collisions.
3Ease of operation
If stations transmit without coordinated resource allocation, then the system operates with simple access rules, but interference increases causing packets to collide with acknowledgement information
Solution Approach 1:
The access point acts as an intermediary that coordinates resource allocation between stations. By generating and distributing the network resource usage indicator, the access point mediates resource conflicts before they occur, allowing stations to transmit with simple rules while avoiding interference through centralized coordination.
Solution Approach 2:
The access point performs preliminary resource allocation and informs stations of the allocation through the network resource usage indicator before transmissions occur. This preliminary action establishes clear transmission rules for stations, maintaining operational simplicity while preventing interference through advance planning.
Data Source
AI summary
A method for communicating in a wireless communications system includes receiving, by a first station, an uplink scheduling information and a first frequency resource usage indicator from an access point, the first frequency resource usage indicator indicating a utilization of a first set of network resources for carrying acknowledgement information from the access point. The method also includes transmitting, by the first station, a first data packet to the access point in accordance with the uplink scheduling information and also transmitting, by the first station, a second frequency resource usage indicator to a second station that is not served by the access point, the second frequency resource usage indicator indicating that the first set of network resources are being utilized by the first station.