Wireless Connection Reestablishment via Virtual Channel Scans
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Solution Overview
Problem
Dynamic frequency selection (DFS) radar avoidance measures in wireless communication networks lead to temporary loss of wireless connections due to varying regulatory standards and inefficient channel scanning processes, causing disrupted communications and poor quality of service (QoS).
Innovation Solution
A method that detects lost connections using DFS triggers, identifies alternative routes from routing tables, and transmits request messages to establish new wireless connections without physical channel scans, enabling 'virtual channel scans' to quickly reestablish connections and avoid unnecessary disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical channel scans are performed to find new channels after DFS radar detection, then reliable channel selection is achieved, but connection reestablishment time increases and communication disruption worsens
Solution Approach 1:
The patent maintains pre-computed routing tables and channel information before DFS events occur. When radar is detected, the system can immediately switch to pre-identified alternative channels and routes without performing time-consuming physical scans, thus resolving the contradiction between reliable channel selection and fast reestablishment
Solution Approach 2:
The patent creates virtual copies of channel information and routing data that can be quickly referenced and applied when DFS events occur. Instead of scanning physical channels from scratch, the system uses pre-captured channel state information to rapidly reestablish connections
2Object-affected harmful factors
If DFS radar avoidance measures are implemented to prevent interference with radar systems, then coexistence between broadband networks and radar systems is achieved, but wireless connections are temporarily lost and communication reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where DFS trigger notifications are propagated through the network, and routing tables are dynamically updated based on this feedback. When one device detects radar, it notifies others, enabling coordinated channel switching that maintains overall network reliability while preventing radar interference
Solution Approach 2:
The system pre-computes alternative routes and channels before DFS events occur. When radar avoidance is triggered, devices can immediately switch to pre-prepared alternative paths, maintaining connection reliability while still implementing radar avoidance measures
3Adaptability or versatility
If coordinated communication between network nodes is established to share DFS channel information, then network-wide DFS compliance is achieved, but communication overhead increases and system complexity worsens
Solution Approach 1:
Each network node independently maintains its own routing table and DFS state information, making autonomous decisions based on local DFS trigger notifications. This self-service approach achieves network-wide DFS compliance without requiring complex centralized coordination mechanisms, thus reducing system complexity while maintaining adaptability
Data Source
AI summary
A device and method enable reestablishing a wireless connection in a wireless network. A first wireless device detects that a previous wireless connection has been lost with a second wireless device that employs dynamic frequency selection (DFS). The first wireless device then uses a routing table to identify a third wireless device as a next hop of a route to the second wireless device, and transmits a request message to the third wireless device, where the request message requests identification of a current DFS channel over which the second wireless device is operating. Next, the first wireless device receives a response message from the third wireless device, where the response message identifies the current DFS channel over which the second wireless device is operating. Using the current DFS channel, the first wireless device establishes a new wireless connection with the second wireless device.