Wireless Network Server Grouping Terminals for Hidden Node Interference
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Solution Overview
Problem
Hidden node interference occurs in wireless communication networks, particularly in LPWANs, due to end devices not detecting signals from other transmitting devices, leading to packet collisions and reduced communication capacity.
Innovation Solution
A method is implemented where a server determines neighbor base stations and sets reference base stations based on hop distances, groups terminals connected to a target base station into groups, and allocates different time resources to each group to reduce hidden node interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If end devices transmit data based on contention-based access scheme (LBT) without detecting distant signals, then transmission simplicity is maintained, but hidden node interference occurs causing packet collisions
Solution Approach 1:
The patent introduces a server as an intermediary that collects channel state information from multiple base stations and makes centralized transmission decisions. The server acts as a mediator that coordinates transmissions between end devices and base stations, preventing hidden node interference by having the server allocate time resources and control transmission timing based on aggregated channel state information from neighboring base stations.
2Reliability
If end devices perform channel state measurement before transmission, then transmission coordination is attempted, but distant transmitting signals are not detected leading to erroneous channel state judgment
Solution Approach 1:
The patent merges the detection capabilities of multiple base stations by having them all report channel state information to a central server. Instead of relying on a single end device's limited detection range, the system combines observations from multiple base stations to create a comprehensive view of channel conditions, including distant transmissions that individual devices cannot detect.
3Productivity
If all terminals connected to a base station transmit simultaneously using same time resource, then communication efficiency is maximized, but hidden node interference from different base stations causes collisions
Solution Approach 1:
The patent segments the transmission resources by dividing terminals into different groups based on their associated base stations and allocating different time resources to each group. This segmentation prevents simultaneous transmissions from different base station coverage areas that would cause hidden node interference, while still allowing efficient parallel transmissions within each group.
Data Source
AI summary
A method of controlling a wireless communication network, performed by a server, includes determining neighbor base stations adjacent to a target base station based on a connection relationship between a plurality of base stations; setting at least two reference base stations based on hop distances between the neighbor base stations; grouping terminals connected to the target base station into at least two groups based on information of the at least two reference base stations, and allocating a different time resource to each of the at least two groups.