Wireless Sectorization for Group Assignment and Collision Reduction
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Solution Overview
Problem
Existing wireless communication systems, particularly IEEE 802.11ah, face challenges in efficiently assigning stations to groups in local wireless networks, especially when geographic location information is not available, leading to issues like the 'hidden terminal' problem and increased collisions, which affect network performance and energy efficiency.
Innovation Solution
The method involves using location information to test and assign stations to groups based on link sufficiency between stations and nodes, dividing the geographic region into sectors associated with groups, and assigning stations based on their location relative to these sectors, thereby reducing collisions and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If stations are assigned to groups without location information, then group assignment can be performed, but the hidden terminal problem occurs and collisions increase
Solution Approach 1:
The service area is divided into multiple sectors based on geographic location, and stations are assigned to groups corresponding to their location sector. This segmentation approach ensures that stations in different geographic regions are grouped separately, reducing the hidden terminal problem and collisions while maintaining ease of group assignment operation.
2Reliability
If more groups are created to reduce collisions, then collision reduction is achieved, but device complexity increases
Solution Approach 1:
The system creates groups with local quality characteristics by assigning stations to groups based on their geographic sector. Each group corresponds to a specific geographic region, providing localized collision reduction without requiring complex global group management. The AP manages groups based on sector information, simplifying the overall system complexity.
3Reliability
If location-based sectorization is implemented, then hidden terminal problem is mitigated, but measurement precision requirements increase
Solution Approach 1:
Stations determine their own sector/group assignment based on location information provided by the AP. The AP transmits sector information that stations use to self-assign to appropriate groups, reducing the need for high-precision location measurement while still mitigating the hidden terminal problem through geographic-based grouping.
Data Source
AI summary
A geographic region in which an access point AP lies is divided into sectors, each sector associated with a group; and a station is assigned to a group based on location information of the station relative to the sectors. The station can assign itself to a group autonomously, after determining the number of groups from signalling received from the AP. Or the AP can do the group assignments, such as by assessing distance between adjacent stations. The AP can utilize the station's location information to test whether a first link between the station and a first node of a first group is sufficient. If the test indicates that the first link is sufficient the AP can assign the station to the first group, else it will utilize the location information to test whether a second link between the station and a second node of a second group is sufficient.