MU-RTS Frame Transmission Control for Wireless Interference
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Solution Overview
Problem
In multi-user wireless communication, the overhead of MU-RTS/CTS processing reduces bandwidth usage efficiency, and there is a risk of packet interference due to hidden terminal effects when MU-RTS/CTS processing is not performed.
Innovation Solution
A communication apparatus that determines whether to transmit an MU-RTS frame based on data size or bandwidth usage time, and transmits the MU-RTS frame prior to multi-user communication to suppress interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MU-RTS/CTS processing is performed in multi-user communication, then interference suppression is improved, but bandwidth usage efficiency deteriorates due to overhead
Solution Approach 1:
The patent dynamically adjusts whether to perform MU-RTS/CTS processing based on communication conditions. The AP determines whether to transmit MU-RTS frames by evaluating factors such as the number of users, data size, and channel conditions, making the interference suppression mechanism adaptive rather than static. This resolves the contradiction by enabling interference suppression only when necessary, thereby maintaining reliability while improving bandwidth efficiency.
Solution Approach 2:
The patent changes the parameter of RTS transmission by introducing selective transmission based on communication conditions. Instead of always transmitting MU-RTS frames, the system modifies the transmission decision parameter based on factors like the number of associated users, data size requirements, and channel state. This parameter change allows the system to balance between interference suppression and bandwidth efficiency.
2Productivity
If MU-RTS/CTS processing is not performed, then bandwidth usage efficiency is improved, but signal collisions increase due to hidden terminal effects
Solution Approach 1:
The system dynamically switches between performing and skipping MU-RTS/CTS processing based on real-time communication conditions. When hidden terminal effects are detected or suspected (through evaluating user distribution, data size, and channel conditions), the system activates RTS transmission to prevent collisions. When conditions are favorable, it skips RTS to maximize bandwidth efficiency, thus dynamically balancing reliability and productivity.
Solution Approach 2:
The patent implements a feedback mechanism where the AP evaluates communication conditions and adjusts RTS transmission decisions accordingly. The system monitors factors such as the number of associated users, channel state, and communication patterns, then uses this feedback to determine whether MU-RTS/CTS processing should be performed. This feedback loop ensures that collision prevention is activated only when necessary, optimizing both reliability and bandwidth efficiency.
3Reliability
If MU-RTS frames are transmitted for all multi-user communication, then interference control is improved, but communication overhead increases
Solution Approach 1:
The patent applies partial action by transmitting MU-RTS frames only for a subset of multi-user communication scenarios rather than all cases. The system evaluates communication conditions and selectively activates RTS transmission when interference control is likely to be beneficial, such as when multiple users are associated or when data size exceeds a threshold. This partial application of RTS processing reduces overhead while maintaining adequate interference control.
Solution Approach 2:
The system changes the transmission parameter by introducing conditional logic that modifies whether MU-RTS frames are sent based on evaluated parameters such as the number of users, data size, and channel conditions. This parameter-based decision-making transforms the RTS transmission from a fixed always-on mechanism to a conditional process, reducing communication overhead while preserving interference control where needed.
Data Source
AI summary
A communication apparatus capable of multi-user communication in which signals are multiplexed and communicated to one or more other communication apparatuses, the communication apparatus determines whether to transmit an MU-RTS (Multi User Request To Send) frame based on a size of data scheduled to be transmitted or received in accordance with the multi-user communication, and, in a case where it is determined to transmit the MU-RTS frame, transmits the MU-RTS frame prior to the multi-user communication.