Modified RTS/CTS Protocol for Wireless Network Interference Reduction
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Solution Overview
Problem
High-efficiency wireless networks face inefficiencies due to device interference and congestion, leading to reduced network capacity and increased latency as the number of active devices grows, especially in densely populated areas.
Innovation Solution
The implementation of a modified RTS/CTS exchange protocol that includes a spoofed duration indication in packet transmission, allowing devices to differentiate between concurrent and non-concurrent transmission capabilities, thereby reducing interference and optimizing scheduling for improved network throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If devices transmit packets concurrently in high-efficiency wireless networks, then network throughput increases, but interference between devices increases causing transmission failures
Solution Approach 1:
The system performs preliminary actions by having devices send RTS (Request to Send) messages before actual data transmission and CTS (Clear to Send) messages in response. This preliminary exchange reserves the communication channel and notifies other devices to remain silent during the scheduled transmission period, preventing interference before it occurs. The duration field in these messages establishes a protective time window that ensures concurrent transmissions do not interfere with each other.
2Reliability
If the RTS/CTS protocol is used to prevent interference, then transmission reliability improves, but protocol complexity and overhead increase
Solution Approach 1:
The patent applies local quality by making the RTS/CTS protocol optional rather than universal. Devices are configured with a capability indicator that shows whether they support the enhanced protocol. The access point (AP) selectively applies the protocol based on device capabilities and network conditions. This allows the reliability benefits to be applied locally to devices that need them while keeping the overall system simple and compatible with standard devices.
Solution Approach 2:
The patent changes the duration parameter in the RTS/CTS messages to reflect the actual transmission time more accurately. Instead of using fixed or conservative duration values, the system calculates and sets the duration field to match the precise time needed for data transmission and acknowledgment. This parameter optimization reduces unnecessary channel reservations while maintaining reliable transmission protection.
3Quantity of substance
If more devices are allowed to access the network simultaneously, then network capacity increases, but congestion and latency increase
Solution Approach 1:
The system enables continuous useful action by allowing multiple devices to transmit data simultaneously through the AP using spatial multiplexing. The AP receives concurrent transmissions from multiple stations and processes them in parallel. This continuous parallel operation increases network capacity and reduces latency compared to sequential access methods, as the useful transmission action continues without interruption across multiple spatial channels.
Solution Approach 2:
By performing preliminary RTS/CTS exchanges, the system reserves channel access rights in advance for multiple devices. This preliminary scheduling allows the network to coordinate concurrent transmissions efficiently, enabling more devices to access the network simultaneously without causing congestion. The duration field established in the preliminary phase ensures that each device knows when to transmit and when to remain silent, maintaining orderly high-capacity operation.
Data Source
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AI summary
Methods and apparatus for adjusting transmission power in wireless networks are provided. One aspect of the disclosure provides an apparatus for wireless communication. The apparatus includes a processing system configured to receive a message instructing each of multiple devices to transmit a packet at least partially concurrently with each transmission of the other multiple devices. The processing system is further configured to generate the packet. The packet includes an indicator having a value greater than a time associated with a transmission of the packet. An interface is configured to provide the packet for transmission.