Wireless Network Sensor Data Prioritization and Cellular Offload Management
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Solution Overview
Problem
Wireless communication systems face challenges in reducing power consumption for devices in low power mode, as they require significant power to reestablish communications and stay in power save mode for extended periods, leading to inefficiencies and battery drain in devices like sensor devices.
Innovation Solution
Implementing techniques that allow devices to prioritize channel access for power-constrained sensor devices over cellular offload data, using higher channel bandwidths for offload data, and optimizing transmission parameters to minimize power usage, such as limiting channel scanning delays and backoff times, and scheduling transmissions to accommodate devices in power save mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices frequently reestablish communications to check for data, then data transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic wake-up intervals where devices in power save mode wake up at predetermined intervals to check for buffered data, then return to sleep mode. This periodic action balances reliability (ensuring data is eventually received) with power conservation (limiting active communication periods).
Solution Approach 2:
The access point performs preliminary actions by buffering incoming data for power-constrained devices before the devices wake up. This allows data to be ready and waiting, eliminating the need for devices to frequently wake up to check for new data, thus reducing power consumption while maintaining reliability.
2Productivity
If channel access priority is given to sensor devices, then sensor device transmission efficiency is improved, but cellular offload data transmission may be delayed
Solution Approach 1:
The patent applies different channel access priorities to different data types locally. Sensor device data units are assigned highest priority for immediate transmission, while cellular offload data units are assigned lower priority. This local differentiation allows sensor communications to proceed efficiently without completely blocking offload traffic.
Solution Approach 2:
The patent segments channel access into different priority levels, creating separate transmission queues for sensor device data and cellular offload data. This segmentation allows the system to handle different traffic types with appropriate priority levels, ensuring sensor data gets timely delivery while offload data is transmitted when resources are available.
3Use of energy by moving object
If devices stay in power save mode for extended periods, then power consumption is reduced, but channel access delays increase
Solution Approach 1:
The access point performs preliminary data buffering for power-constrained devices before they wake up from power save mode. This preliminary action ensures that when devices do wake up, their data is already prepared and can be transmitted immediately, minimizing channel access delays while allowing devices to remain in power save mode longer.
Solution Approach 2:
The access point acts as an intermediary that holds and manages data for power-constrained devices during their sleep periods. This intermediary role allows devices to extend their power save duration without incurring transmission delays, as the access point buffers data and quickly transmits it upon device wake-up.
Data Source
AI summary
First data units associated with one or more power-constrained sensor devices are transmitted in a wireless network, and second data units associated with offload of cellular telephone data are transmitted in the wireless network. Priority is given to transmission of the first data units over transmission of the second data units with regard to access to a wireless medium. Transmissions in the wireless network are permitted at a plurality of different channel bandwidths including a minimum channel bandwidth, and transmissions in the wireless network corresponding to offload of cellular telephone data are permitted only using a channel bandwidth, among the plurality of different channel bandwidths, that is greater than the minimum channel bandwidth.