Wireless Client Channel Hopping for Low-Latency Industrial Networks
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Solution Overview
Problem
In ad-hoc wireless networks, client-server models face challenges with synchronization and resource management due to interference, leading to data collisions and delays, especially in time-critical applications where clients may lose beacon signals and require rapid channel changes.
Innovation Solution
Clients are granted autonomy to select and allocate optimal time slots and frequency channels within a superframe, allowing them to hop channels based on previous communications and interference conditions, rather than relying solely on the server-defined sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the server uses a pre-defined hopping sequence of channels at regular intervals, then synchronization between server and clients is maintained, but clients may experience extended communication delays when beacon loss occurs
Solution Approach 1:
The patent transforms the static, server-controlled channel hopping sequence into a dynamic system where clients can autonomously select and switch channels based on real-time beacon reception status. This enables adaptive response to interference conditions while maintaining synchronization reliability.
Solution Approach 2:
Clients are empowered to autonomously monitor beacon signals and independently switch channels when interference is detected, rather than passively following server-directed hopping sequences. This self-service capability reduces dependency on server control and minimizes communication delays during beacon loss events.
2Device complexity
If the server allocates time slots and channels centrally using beacon frames, then resource management is simplified, but clients must wait for server-directed channel changes which increases latency
Solution Approach 1:
The patent segments the centralized resource management function by allowing clients to independently handle channel selection and switching decisions. This divides the previously monolithic server-controlled process into distributed client autonomy for channel hopping while the server maintains time slot allocation oversight.
Solution Approach 2:
Clients pre-monitor beacon frames and proactively detect interference conditions, enabling them to initiate channel switches before complete synchronization is lost. This preliminary detection and action reduces the latency compared to waiting for server-directed channel changes.
3Adaptability or versatility
If clients use CSMA/CD protocol to access shared uplink intervals, then asynchronous communications are enabled, but data collisions occur when multiple clients transmit concurrently
Solution Approach 1:
The patent introduces frequency channel hopping as an intermediary mechanism to separate clients in the frequency domain during uplink transmissions. By assigning different channels to clients experiencing interference, it mediates the collision problem while preserving asynchronous access capability.
Data Source
AI summary
In a wireless network including a server and clients, network resources, such as time slots and channel frequencies, are managed by having the server define the resources for future use by the clients, while the clients actually allocate the resources for their exclusive use according to performance criteria determined by the clients. The network can be ad-hoc and in industrial environments with low-latency requirements.