RIS Wake-Up Beamforming for Low-Contention WuR Data Collection
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Solution Overview
Problem
Existing wake-up based networks face inefficiencies in data collection due to unnecessary power consumption and increased latency caused by channel contention and collisions among all terminals receiving wake-up signals, leading to reduced data throughput and extended data collection delays.
Innovation Solution
A data collection system utilizing a wake-up radio (WuR) terminal that operates in sleep mode by default, activating only when signaled, and a reconfigurable intelligent surface (RIS) that selectively beams signals to specific terminals, allowing controlled data transmission without channel contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all terminals receive the wake-up signal and operate in active mode, then the AP can collect data from all terminals, but unnecessary energy waste occurs and data collection delay increases due to channel contention and collisions
Solution Approach 1:
The patent segments the network into active and sleep mode terminals, and further segments data collection into targeted groups. The AP identifies specific terminals needing data collection and activates only those terminals, rather than activating all terminals. This segmentation eliminates unnecessary energy consumption from inactive terminals while maintaining efficient data collection from relevant terminals.
Solution Approach 2:
The patent applies partial action by activating only the necessary subset of terminals for data collection rather than all terminals. The AP sends wake-up signals selectively to identified terminals based on data collection requirements, performing exactly the needed action without excess activation of unnecessary terminals, thereby reducing energy waste while maintaining productivity.
2Ease of operation
If RIS controls passive elements to transmit signals to multiple terminals, then beamforming capability is achieved, but the time required for controlling RIS increases, lowering data throughput and latency performance
Solution Approach 1:
The patent segments the terminal group into multiple subgroups for RIS beamforming operations. Instead of controlling RIS to serve all terminals simultaneously (which consumes excessive time), the system divides terminals into manageable groups and sequentially applies beamforming to each group. This segmentation reduces the time required for RIS control while maintaining beamforming capabilities, thereby improving data throughput.
Solution Approach 2:
The patent implements periodic beamforming operations where RIS sequentially serves different terminal groups in time-divided slots. Each group receives beamformed signals during its designated time period, and RIS reconfigures for the next group. This periodic action allows beamforming capability to be maintained while reducing overall control time and improving data throughput through efficient time utilization.
3Ease of operation
If RIS controls passive elements to transmit signals to multiple terminals, then selective signal transmission is achieved, but the time required for controlling RIS increases, increasing latency
Solution Approach 1:
The patent applies preliminary action by pre-identifying the terminals that require data collection before initiating RIS control. The AP determines which terminals need activation and data transmission in advance, preparing the terminal list beforehand. This preliminary identification reduces the overall time required for selective signal transmission by eliminating unnecessary processing steps and reducing latency.
Solution Approach 2:
The patent segments the selective signal transmission process into targeted groups based on terminal requirements. By dividing terminals into specific groups that need activation versus those that remain in sleep mode, the system reduces the time required for RIS control compared to serving all terminals. This segmentation enables faster selective transmission by focusing resources only on necessary terminals.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances energy efficiency and reduces data transmission latency by minimizing channel contention and optimizing data collection through selective activation of terminals, thereby improving overall network performance.
Implementation Method 1
The RIS may transmit the signal to the AP by reflecting the signal transmitted by the terminal in a specific direction through beamforming
Implementation Method 2
the RIS that received the unmodulated signal may transmit the information that the AP is about to transmit to the terminal by performing its own modulation process
Implementation Method 3
RIS has the advantage of being able to selectively transmit the signal to a specific terminal located in a short distance by adjusting the phase of each passive element
Data Source
AI summary
There is provided a data collection system. The data collection system comprises a wake-up radio (WuR) terminal that operates in sleep mode when a wake-up signal is not received and transmits data in active mode when the wake-up signal is received; an Access Point (AP) terminal that stores information on a total number of WuR terminals in a network and sensing data collected by the WuR terminal, sets a slot through which the data is to be transmitted by the WuR terminal, and receives the data from the WuR terminal in the set slot; and a reconfigurable intelligent surface (RIS) that controls passive elements in groups, modulates the groups into different signals at the same time, and transmits the signals to a plurality of WuR terminals in a beamforming manner.